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Tokyo

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Tokyo is the capital city of Japan and serves as a significant center for global research, academic inquiry, and geopolitical discourse. As an advanced market democracy, it is frequently analyzed in international contexts regarding its role in regional stability and its status as a major urban hub Tokyo in democracies. Beyond its administrative and political identity, Tokyo is home to a robust infrastructure of specialized firms, such as Combi Wellness Co., Ltd. and Chest, which provide essential equipment for scientific and medical research Tokyo treadmill used.

In contemporary academic literature, Tokyo is frequently characterized by its high-pressure university environment. Research, such as the comparative study by Ampofo et al. (2025) published in Frontiers in Sleep, highlights the city as a site where intense academic demands, long study hours, and cultural norms prioritizing productivity over rest contribute to significant sleep deprivation among students intense academic pressure. This environment is often contrasted with more diverse settings like London, with studies indicating that Tokyo students report poorer sleep quality, characterized by higher scores on the Pittsburgh Sleep Quality Index (PSQI) and shorter sleep durations.

The cognitive impact of this environment is a primary focus of recent cross-sectional studies. Tokyo students have demonstrated lower performance across various cognitive domains, including verbal learning (RAVLT), attention and executive function (Stroop Test), non-verbal reasoning (RPM), and cognitive flexibility (WCST) negative associations cognitive domains. Data indicates that the negative correlation between poor sleep and cognitive performance is often stronger in Tokyo than in comparative cities, suggesting that cultural factors and chronic stress may exacerbate the detrimental effects of sleep deficiency on memory consolidation and mental acuity stronger RAVLT correlation.

While there is a consensus regarding the negative impact of sleep quality on cognitive performance in Tokyo, findings regarding the statistical significance of these interactions vary by specific cognitive test. For instance, while moderation analyses have confirmed a significantly stronger link between sleep and memory performance (RAVLT) in Tokyo stronger RAVLT moderation, other metrics, such as the interaction between sleep and city on WCST performance, have shown non-significant results in some analyses non-significant WCST interaction.

To ensure accuracy in these research settings, investigators often employ culturally adapted testing protocols, such as using Japanese color words for the Stroop Test Japanese color words for Stroop or incorporating culturally relevant vocabulary into memory tests adapted RAVLT for Tokyo. These methodological adjustments underscore the importance of context when studying the intersection of lifestyle, culture, and cognitive health in Tokyo’s unique academic landscape. Experts suggest that addressing these issues requires culturally tailored interventions, such as systemic efforts to reduce academic pressure and mitigate the stigma surrounding mental health tailored interventions recommended.

Model Perspectives (4)

openrouter/x-ai/grok-4.1-fast definitive 90% confidence

The facts portray Tokyo primarily as the location of a cross-sectional study published in Frontiers involving 200 university students, who reported significantly poorer sleep quality (mean PSQI = 9.2, SD = 3.0) compared to 200 students in London (mean PSQI = 7.8, SD = 3.3, p < 0.001, Cohen's d = 0.44) poorer sleep in Tokyo. These Tokyo students also exhibited lower cognitive performance across tests, including WCST (mean 50.1 vs. London's 54.7) lower WCST in Tokyo, RAVLT (53.8 vs. 56.6), Stroop Test (73.2 vs. 78.4), and RPM (27.5 vs. 28.7) London outperforms Tokyo. Negative correlations between poor sleep (higher PSQI) and cognition were stronger in Tokyo, such as RAVLT (r = -0.40 vs. -0.25) stronger RAVLT correlation and RPM (r = -0.30 vs. -0.15) RPM correlation Tokyo, with moderation analyses confirming a significantly stronger PSQI-RAVLT link in Tokyo (β = -0.35 vs. -0.15) stronger RAVLT moderation. According to the Frontiers study, this is attributed to Tokyo's intense academic environment, long study hours, competitive systems, and cultural norms prioritizing productivity over rest, leading to circadian misalignment and higher cognitive load intense academic pressure, cultural study hours. Demographics include mean age 21.5 ± 2.3 years, 58% female Tokyo demographics, and disciplines like 40% sciences academic disciplines. Two Nature studies reference equipment from Tokyo firms, such as a treadmill from Combi Wellness Co., Ltd. Tokyo treadmill and a hypoxic system from Will Co. Ltd. Tokyo gas generator, indicating local research infrastructure.

openrouter/x-ai/grok-4.1-fast definitive 88% confidence

Tokyo serves as a primary research site in a comparative study by Ampofo et al. (2025) published in Frontiers in Sleep, examining sleep quality's impact on cognitive functions among university students, contrasting it with London. Students in Tokyo exhibit poorer sleep quality, with higher Pittsburgh Sleep Quality Index (PSQI) scores, shorter sleep duration (6.1 ± 1.1 hours), and lower sleep efficiency (82.5 ± 7.0%) per actigraphy data compared to London peers. This ties to a stringent academic environment characterized by rote learning emphasis, long study hours, high societal expectations, and cultural norms prioritizing productivity, fostering chronic stress, anxiety, and sleep deprivation. Cognitive impacts are pronounced: Tokyo students score lower on Rey Auditory Verbal Learning Test (RAVLT), Wisconsin Card Sorting Test (WCST), Stroop Test, and Raven's Progressive Matrices, with stronger negative correlations between PSQI and performance on RAVLT (β = -0.35), WCST (-0.42), and Stroop (-0.35). Moderation analyses show city interacts significantly with sleep on RAVLT performance, indicating cultural modulation amplifies poor sleep's effects on memory and flexibility in Tokyo. Test adaptations used Japanese color words for Stroop, and pre-testing WCST symbols was recommended for cultural sensitivity. Beyond the study, Tokyo hosted the KSEM 2021 conference and is home to firms like POLAR Electro and A&D producing study equipment. It exemplifies propositional knowledge as Japan's capital per Koemhong Sol and Kimkong Heng (Cambodian Education Forum). Overall, facts depict Tokyo's university context as high-pressure, exacerbating sleep-cognition links versus London's more diverse setting.

openrouter/x-ai/grok-4.1-fast definitive 75% confidence

Tokyo serves as a primary research site in the Frontiers study 'Investigating the impact of sleep quality on cognitive functions among students in Tokyo, Japan, and London, UK' by Ampofo et al. (2025), involving 200 university students (mean age 22.3 years, 58% female, 42% male) aged 18-30 Tokyo student demographics. This cross-sectional study, using multivariate regression and structural equation modeling, found poorer sleep quality (measured by Pittsburgh Sleep Quality Index, PSQI) strongly linked to diminished cognitive performance across domains like verbal learning (Rey Auditory Verbal Learning Test, RAVLT), attention/executive function (Stroop Test), and non-verbal reasoning (Raven's Progressive Matrices, RPM) study on 400 students. Tokyo students scored lower on RAVLT (mean 53.8, SD 8.0 vs. London's 56.6, SD 8.8) with stronger negative correlations, e.g., PSQI-RAVLT r=-0.40 (p<0.001) vs. -0.25 (p<0.01) in London, and the interaction effect was significant (β=-0.20, p=0.03) Tokyo lower RAVLT scores stronger PSQI-RAVLT correlation significant RAVLT interaction. Factors include intense academic pressure, cultural prioritization of study over sleep, fast-paced lifestyle, and mental health stigma, exacerbating sleep-cognition links compared to London Tokyo academic pressure prioritize study over sleep. RAVLT was culturally adapted with Tokyo-relevant words like Sakura and Sushi adapted RAVLT for Tokyo. Authors recommend culturally tailored interventions like reducing academic pressure tailored interventions recommended. Separately, Nature studies used equipment from Tokyo firms, e.g., Aero Walker treadmill by Combi Wellness Co., Ltd. and spirometer by Chest Tokyo treadmill used. Geopolitically, CSIS notes Tokyo among advanced market democracies analyzing China challenges Tokyo in democracies.

openrouter/x-ai/grok-4.1-fast 85% confidence

According to research published by Frontiers, university students in Tokyo, Japan, face a more pronounced negative impact of poor sleep quality—as measured by the Pittsburgh Sleep Quality Index (PSQI)—on cognitive functions compared to students in London impact more pronounced in Tokyo. The study, involving participants with a mean age of 22.3 ± 2.7 years in the Tokyo group mean age Tokyo group, identified significant negative associations between PSQI scores and performance in verbal learning/memory (RAVLT), attention/executive function (Stroop Test), non-verbal reasoning (RPM), and cognitive flexibility (WCST) negative associations cognitive domains. Frontiers attributes this to Tokyo's stringent academic environment and high societal expectations, which contribute to chronic stress and anxiety stringent academic environment Tokyo, alongside intense pressure and cultural stigma around mental health that lead to untreated conditions compromising sleep and cognition cultural stigma mental health Tokyo. Unique Tokyo stressors exacerbate sleep deprivation's effects on memory consolidation Tokyo stressors memory consolidation, with the study noting notable cultural differences between Tokyo and London in sleep patterns and mental health cultural differences Tokyo London. However, the interaction between PSQI and city on WCST performance was not statistically significant (β = −0.12, p = 0.09) non-significant WCST interaction.

Facts (162)

Sources

Investigating the impact of sleep quality on cognitive functions ... frontiersin.org Frontiers 154 facts

measurementIn the moderation analysis of university students in Tokyo and London, the interaction terms for the Stroop Test (β = -0.10, p = 0.21), Raven's Progressive Matrices (RPM) (β = -0.05, p = 0.32), and Wisconsin Card Sorting Test (WCST) (β = -0.12, p = 0.09) were not statistically significant.

procedureThe study of university students in Tokyo and London utilizes multivariate regression analyses and structural equation modeling to examine the effects of sleep quality on cognitive functions.

claimThe more pronounced negative effect of poor sleep quality on verbal learning and memory in Tokyo students may be attributed to intense academic pressure, longer study hours, or cultural factors.

measurementThe correlation between PSQI scores and RAVLT (verbal learning and memory) performance is -0.40 in Tokyo and -0.25 in London.

claimTheoretical frameworks relevant to understanding the dynamic of sleep and cognitive function in Tokyo and London include the Stress-Performance Relationship, the relationship between stress and mental health, and the impact of sleep quality on cognitive functions and mental health.

measurementThe mean age of the 200 participants in Tokyo was 21.5 ± 2.3 years, while the mean age of the 200 participants in London was 22.1 ± 2.5 years.

measurementThe mean age of the study participants was 22.3 ± 2.7 years for the Tokyo group and 22.7 ± 2.9 years for the London group.

claimA proposed study aims to explore the relationship between various dimensions of sleep quality and cognitive load among students in Tokyo and London, accounting for cultural and environmental factors.

claimThe study's conceptual framework examines the connection between sleep quality and cognitive functions in university students from Tokyo, Japan, and London, UK, by combining theoretical viewpoints and empirical evidence to demonstrate the impact of sleep quality on cognitive performance and the role of cultural contexts.

claimDifferences in sleep quality and cognitive performance between students in Tokyo and London may reflect variations in circadian alignment and sleep-wake patterns across the two cultural contexts.

claimInterventions such as stress management workshops, counseling services, and mental health awareness campaigns can help reduce the burden of stress and improve mental health outcomes among students in Tokyo and London.

measurementStudents in London score higher on the Wisconsin Card Sorting Test (WCST) compared to students in Tokyo, regardless of sleep quality (β = 0.18, p = 0.03).

measurementIn a moderation analysis of university students in Tokyo and London, the interaction term (PSQI x City) for the RPM cognitive measure was β = -0.05 (SE = 0.05, t = -1.00, p = 0.32).

claimThe study suggests a potential trend where the negative impact of poor sleep quality on Wisconsin Card Sorting Test (WCST) performance is stronger in Tokyo than in London, though the effect remains inconclusive.

claimIn Tokyo, the combination of an intense academic environment, a demanding curriculum, and competitive educational systems imposes a high cognitive load on students, which, when combined with sleep deprivation, creates a cycle of cognitive overload and impaired learning.

measurementUniversity students in Tokyo scored lower on the Wisconsin Card Sorting Test (WCST) with a mean of 50.1 (SD = 9.0) compared to university students in London, who scored a mean of 54.7 (SD = 10.0).

claimThe study demonstrates that differences in sleep quality between university students in Tokyo and London translate into differences in cognitive performance.

referenceThe study 'Investigating the impact of sleep quality on cognitive functions' utilized a moderation analysis to test whether the relationship between sleep quality (PSQI scores) and cognitive performance (measured by RAVLT, Stroop Test, RPM, and WCST) differs significantly between university students in Tokyo and London.

claimThe study investigated variations in sleep quality and cognitive performance stemming from distinct cultural contexts and academic pressures in Tokyo and London.

claimThere is an inverse relationship between sleep quality and cognitive performance in both Tokyo and London, where poorer sleep quality (indicated by higher PSQI scores) is associated with lower performance on cognitive tests.

measurementThe relationship between Pittsburgh Sleep Quality Index (PSQI) scores and Raven's Progressive Matrices (RPM) performance does not differ significantly between students in Tokyo and London (β = −0.05, p = 0.32).

measurementThe relationship between PSQI score and RAVLT performance was significantly stronger in Tokyo (β = −0.35, p < 0.001) compared to London (β = −0.15, p < 0.05), according to a moderation analysis examining cultural context.

measurementUniversity students in Tokyo reported significantly poorer sleep quality (Mean PSQI = 9.2, SD = 3.0) compared to university students in London (Mean PSQI = 7.8, SD = 3.3) with a p-value < 0.001 and Cohen's d = 0.44.

measurementThe gender distribution of the study participants was 58% female and 42% male in Tokyo, and 52% female and 48% male in London.

perspectiveA comparative analysis of the relationship between sleep quality and cognitive functions in Tokyo and London is essential for developing targeted interventions for students in these distinct cultural contexts.

measurementIn a moderation analysis of university students in Tokyo and London, the interaction term (PSQI x City) for the WCST cognitive measure was β = -0.12 (SE = 0.07, t = -1.71, p = 0.09).

claimIn Tokyo, where long study hours and irregular sleep schedules are common, the impact of sleep deprivation on cognitive functions is particularly concerning.

claimThe research study aims to examine the relationships between stress, mental health, sleep quality, and cognitive function within the specific cultural and academic contexts of Tokyo and London.

claimIn Tokyo, demanding academic schedules and cultural norms prioritizing productivity over rest lead to chronic circadian misalignment, as students engage in late-night study sessions and have early morning classes.

claimUniversity students in Tokyo reported poorer sleep quality and lower cognitive scores compared to university students in London.

measurementThe academic disciplines of the Tokyo participants were 30% Humanities, 40% Sciences, 20% Engineering, and 10% Other; the London participants were 25% Humanities, 35% Sciences, 30% Engineering, and 10% Other.

claimA proposed study aims to investigate the relationship between circadian alignment, sleep quality, and cognitive performance among students in Tokyo and London, considering cultural and environmental factors.

claimThe magnitude of negative correlations between sleep quality and cognitive performance is consistently larger in Tokyo than in London for all cognitive measures, suggesting the impact of sleep quality on cognitive performance may be more pronounced among university students in Tokyo.

claimThe intense academic environment, demanding curriculum, and competitive nature of the educational system in Tokyo impose a high cognitive load on students.

measurementUniversity students in London outperformed university students in Tokyo on cognitive assessments, including the RAVLT (56.6 vs 53.8), Stroop Test (78.4 vs 73.2), RPM (28.7 vs 27.5), and WCST (54.7 vs 50.1).

claimIn the moderation analysis conducted by the study 'Investigating the impact of sleep quality on cognitive functions', the variable β (PSQI) represents the direct effect of sleep quality on cognitive performance controlling for city, β (City) represents the direct effect of city on cognitive performance controlling for sleep quality, and β (PSQI x City) represents the interaction term indicating whether the relationship between sleep quality and cognitive performance differs between Tokyo and London.

claimLondon's academic environment is characterized as more diverse and potentially less rigid than the environment in Tokyo, presenting different challenges for students.

claimThe study of university students in Tokyo and London informed the development of targeted interventions designed to improve sleep quality, reduce stress, and enhance cognitive function.

measurementThe study recruited 400 participants, consisting of approximately 200 students from Tokyo and 200 students from London.

claimIn the cultural context of Tokyo, students often prioritize long study hours over sleep, which leads to disrupted memory consolidation.

imageThe study comparing Tokyo and London students found the following Pearson correlation coefficients (r) between PSQI scores and cognitive measures: RAVLT (Tokyo: -0.40, London: -0.25), Stroop Test (Tokyo: -0.35, London: -0.20), RPM (Tokyo: -0.30, London: -0.15), and WCST (Tokyo: -0.42, London: -0.28).

measurementCorrelations between sleep quality and cognitive performance in Tokyo are statistically significant at p < 0.001.

claimThere is a stronger negative relationship between sleep quality and cognitive flexibility and set-shifting abilities in Tokyo compared to London.

claimThe magnitude of negative correlations between sleep quality and cognitive performance is consistently larger in Tokyo than in London for all cognitive measures.

claimA study investigating the impact of sleep quality on cognitive functions among university students collected data from 400 participants, with 200 students from Tokyo, Japan, and 200 students from London, UK.

claimThe impact of sleep quality on verbal learning and memory, as measured by the Rey Auditory Verbal Learning Test (RAVLT), is more pronounced in the cultural context of Tokyo compared to London.

claimThe study's design allowed for the simultaneous collection of data from university students in Tokyo and London, enabling a comparison between the two different student populations.

measurementThe study participants in Tokyo (n = 200) had a mean age of 21.5 ± 2.3 years, with a gender distribution of 45% male and 55% female, and academic disciplines of 30% humanities, 40% sciences, 20% engineering, and 10% other.

measurementThe correlation between Pittsburgh Sleep Quality Index (PSQI) scores and Raven's Progressive Matrices (RPM) performance is −0.30 in Tokyo and −0.15 in London.

measurementA moderation analysis comparing Tokyo and London showed that the relationship between Pittsburgh Sleep Quality Index (PSQI) scores and Rey Auditory Verbal Learning Test (RAVLT) performance was significantly stronger in Tokyo (β = -0.35, p < 0.001) than in London (β = -0.15, p < 0.05).

claimA cross-sectional study of 400 university students (200 in Tokyo and 200 in London) investigated the impact of sleep quality on cognitive functions.

measurementThe correlation between PSQI scores and RPM (non-verbal reasoning) performance is -0.30 in Tokyo and -0.15 in London.

procedureThe study incorporated qualitative data from semi-structured interviews to gain insights into the sociocultural factors influencing sleep behavior among university students in Tokyo and London.

measurementIn a moderation analysis of university students in Tokyo and London, the interaction term (PSQI x City) for the Stroop Test was β = -0.10 (SE = 0.08, t = -1.25, p = 0.21).

claimThe academic environment in Tokyo is characterized by demanding study routines, extended hours dedicated to scholarly pursuits, and societal pressure that discourages taking breaks or valuing rest.

measurementThe gender distribution of the study participants was 58% female and 42% male in Tokyo, and 52% female and 48% male in London.

claimThe study found that the relationship between sleep quality and verbal learning and memory was stronger in Tokyo than in London, a finding described as novel in the literature.

claimThe negative impact of poor sleep quality on verbal learning and memory is more pronounced among university students in Tokyo compared to those in London, indicating that cultural context moderates the relationship between sleep quality and cognitive performance.

measurementIn a moderation analysis of university students in Tokyo and London, the relationship between sleep quality (measured by PSQI) and RAVLT performance showed a standardized regression coefficient (β) of -0.35 (p < 0.001), indicating that poorer sleep quality is associated with lower verbal learning and memory scores across both cities.

claimThe Stroop Test stimuli were adapted for students in Tokyo by using Japanese words for colors: AKA (Red), AO (Blue), MIDORI (Green), and KIIRO (Yellow), printed in red, blue, green, and yellow ink, respectively.

referenceThe study on sleep quality and cognitive wellbeing in Tokyo and London utilizes Memory Consolidation Theory, Cognitive Load Theory, Circadian Rhythm Theory, and the Stress-Performance Relationship as its theoretical frameworks.

claimUniversity students in Tokyo and London exhibit an inverse relationship between sleep quality and cognitive performance, where poorer sleep quality (indicated by higher Pittsburgh Sleep Quality Index scores) is associated with lower performance on cognitive tests.

measurementThe interaction between Pittsburgh Sleep Quality Index (PSQI) scores and city location significantly affects Rey Auditory Verbal Learning Test (RAVLT) performance (β = −0.20, p = 0.03), indicating the relationship between sleep quality and verbal memory differs between Tokyo and London.

measurementThe correlation between Pittsburgh Sleep Quality Index (PSQI) scores and WCST performance is −0.42 (p < 0.001) for students in Tokyo and −0.28 (p < 0.001) for students in London.

claimThe academic environment in London is characterized as more diverse and potentially less rigid than the environment in Tokyo.

measurementThere is no statistically significant difference in Stroop Test performance between students in Tokyo and London when sleep quality is controlled (β = 0.15, p = 0.10), and the interaction between PSQI scores and city location on Stroop Test performance is not significant (β = −0.10, p = 0.21), suggesting the effect of sleep on attention is consistent across both cities.

claimThe study found a more pronounced negative relationship between sleep quality and Rey Auditory Verbal Learning Test (RAVLT) performance in Tokyo compared to London, suggesting that cultural factors may modulate the impact of sleep on memory consolidation.

measurementThere is no statistically significant difference in Raven's Progressive Matrices (RPM) performance between students in Tokyo and London when sleep quality is controlled (β = 0.10, p = 0.10).

claimPrisla Ücker Calvetti, Anna Paradowska-Stolarz, and Caecilia Sri Wahyuning served as reviewers for the article 'Investigating the impact of sleep quality on cognitive functions among students in Tokyo, Japan, and London, UK'.

claimIt is recommended to conduct pre-testing of the Wisconsin Card Sorting Test cards in Tokyo and London to ensure that the symbols and colors used do not carry negative cultural associations.

claimIn a study comparing university students in Tokyo and London, the impact of sleep quality (measured by PSQI scores) on verbal learning and memory (measured by the RAVLT) is more pronounced in the cultural context of Tokyo compared to London.

claimThe relationship between sleep quality and verbal learning and memory is stronger in Tokyo university students than in London university students.

measurementUniversity students in Tokyo scored lower on the Raven's Progressive Matrices (RPM) with a mean of 27.5 (SD = 4.0) compared to university students in London, who scored a mean of 28.7 (SD = 4.4).

measurementPoorer sleep quality, as measured by the Pittsburgh Sleep Quality Index (PSQI), is significantly associated with slower Stroop Test performance (β = −0.25, p < 0.001) across both Tokyo and London student populations.

claimInsufficient or disrupted sleep impairs the brain's ability to encode, store, and retrieve verbal information, as evidenced by negative correlations between sleep quality and Rey Auditory Verbal Learning Test (RAVLT) performance in Tokyo and London students.

claimThe study 'Investigating the impact of sleep quality on cognitive functions' suggests that the impact of sleep quality on verbal learning and memory is more pronounced in the cultural context of Tokyo compared to London.

measurementThe gender distribution of the Tokyo participant group was 45% male and 55% female, while the London participant group was 50% male and 50% female.

measurementThe correlation between Pittsburgh Sleep Quality Index (PSQI) scores and Wisconsin Card Sorting Test (WCST) performance is -0.42 in Tokyo and -0.28 in London, indicating a stronger negative relationship between sleep quality and cognitive flexibility in Tokyo.

claimThe Japanese education system's emphasis on rote learning and memorization may increase reliance on cognitive processes sensitive to sleep deprivation, such as working memory and attention, among students in Tokyo.

claimIn Tokyo, the stringent academic environment and high societal expectations place immense pressure on students, contributing to chronic stress, anxiety, sleep deprivation, and burnout.

measurementActigraphy data showed that university students in Tokyo had lower sleep efficiency (82.5 ± 7.0%) compared to university students in London (87.5 ± 8.0%) with a p-value < 0.001 and Cohen's d = 0.67.

claimThe negative impact of poor sleep on memory was found to be more pronounced in Tokyo compared to London, indicating a moderating role of the city in the relationship between sleep and cognition.

claimThe academic environment and societal expectations in Tokyo contribute to chronic stress, anxiety, sleep deprivation, and burnout among students due to a cultural emphasis on achievement and conformity.

measurementThere is no statistically significant difference in Stroop Test performance between students in Tokyo and London when sleep quality is controlled for (β = 0.15, p = 0.10).

claimStudents in London experience a more harmonious approach to work-life integration, which facilitates improved sleep patterns compared to students in Tokyo.

measurementThe correlation between Pittsburgh Sleep Quality Index (PSQI) scores and Stroop test performance is −0.35 (p < 0.001) for students in Tokyo and −0.20 (p < 0.01) for students in London.

claimIn Tokyo, where long study hours and irregular sleep schedules are common, students who sacrifice sleep to meet academic demands often experience impaired attention, reduced memory capacity, and diminished problem-solving skills.

claimThe negative relationship between sleep quality and Wisconsin Card Sorting Test (WCST) performance is stronger in Tokyo than in London, suggesting that cultural factors modulate the impact of sleep on cognitive load.

claimPoor sleep quality has a stronger negative impact on Rey Auditory Verbal Learning Test (RAVLT) performance in Tokyo compared to London, as indicated by a negative coefficient (β = −0.20).

measurementStudents in Tokyo exhibited lower sleep quality than students in London, as evidenced by average Pittsburgh Sleep Quality Index (PSQI) scores reflecting a more significant occurrence of sleep disturbances.

claimThe study investigated the impact of sleep quality on cognitive functions among university students in Tokyo, Japan, and London, UK, specifically examining how cultural contexts influence this relationship.

claimThe magnitude of the effect of sleep quality on attention and executive function is similar in both Tokyo and London, suggesting consistent influencing factors across these cultural contexts.

claimIntense academic pressure and cultural stigma surrounding mental health issues in Tokyo create a high-risk environment for students.

claimThe study investigates the relationship between specific dimensions of sleep quality (duration, consistency, and disturbances) and cognitive performance (memory retention, attention span, problem-solving abilities, and executive functioning) among university students in Tokyo and London.

claimIn Tokyo, students experience chronic sleep deprivation and circadian misalignment due to demanding academic schedules, cultural norms prioritizing productivity over rest, late-night study sessions, and early morning classes.

measurementIn a moderation analysis of university students in Tokyo and London, the interaction term (PSQI x City) for the RAVLT cognitive measure was β = -0.20 (SE = 0.09, t = -2.22, p = 0.03).

claimThe research article titled 'Investigating the impact of sleep quality on cognitive functions among students in Tokyo, Japan, and London, UK' was published in the journal Frontiers in Sleep on May 26, 2025.

measurementThe article 'Investigating the impact of sleep quality on cognitive functions among students in Tokyo, Japan, and London, UK' was received on December 2, 2024, accepted on April 30, 2025, and published on May 26, 2025.

measurementUniversity students in Tokyo scored lower on the Stroop Test with a mean of 73.2 (SD = 11.5) compared to university students in London, who scored a mean of 78.4 (SD = 12.8).

claimThe intense academic environment, demanding curriculum, and competitive nature of the educational system in Tokyo impose a high cognitive load on students.

claimResearchers hypothesize that intense academic pressure and long study hours in Tokyo may exacerbate the negative effects of poor sleep on memory consolidation processes, leading to a more pronounced decline in verbal learning and memory performance compared to London.

claimUniversity students in Tokyo report poorer sleep quality compared to university students in London, likely due to demanding academic environments and high societal expectations in Japan.

measurementThere is a significant positive effect of city location on Wisconsin Card Sorting Test (WCST) performance (β = 0.18, p = 0.03), indicating that students in London score higher on the WCST compared to students in Tokyo, regardless of their sleep quality.

claimIn Tokyo, intense academic pressure and long study hours, combined with cultural norms that prioritize productivity over rest, create a vulnerable environment for students' memory consolidation processes.

claimStudents in London may experience disruptions in memory consolidation due to stress, irregular sleep schedules, and lifestyle factors, despite potentially facing less overt pressure to study long hours compared to students in Tokyo.

claimAbdel-Salam G. Abdel-Salam from Qatar University served as the editor for the article 'Investigating the impact of sleep quality on cognitive functions among students in Tokyo, Japan, and London, UK'.

measurementThe correlation between PSQI scores and Stroop Test (attention and executive function) performance is -0.35 in Tokyo and -0.20 in London.

measurementThe relationship between Pittsburgh Sleep Quality Index (PSQI) scores and Stroop Test performance does not differ significantly between students in Tokyo and London (β = −0.10, p = 0.21).

measurementIn a moderation analysis of university students in Tokyo and London, the effect of city on RAVLT performance showed a standardized regression coefficient (β) of 0.20 (p = 0.04), indicating that students in London score higher on the RAVLT compared to students in Tokyo, regardless of their sleep quality.

measurementActigraphy data showed that university students in Tokyo had shorter sleep duration (6.1 ± 1.1 hours) compared to university students in London (6.9 ± 1.3 hours) with a p-value < 0.001 and Cohen's d = 0.63.

referenceAmpofo et al. (2025) published the article 'Investigating the impact of sleep quality on cognitive functions among students in Tokyo, Japan, and London, UK' in the journal Frontiers in Sleep.

claimA comparative analysis of the relationship between sleep quality and cognitive functions in Tokyo and London is essential for developing targeted interventions that address the unique challenges faced by students in these distinct cultural contexts.

claimThe study utilizes a cross-sectional design to examine the influence of sleep quality on cognitive functions in university students from Tokyo, Japan, and London, UK.

claimThe study aims to develop evidence-based recommendations for university-level interventions to improve sleep quality and cognitive outcomes among students in Tokyo and London, focusing on strategies such as sleep hygiene programs, flexible academic scheduling, and stress management workshops.

claimThe study on sleep quality in Tokyo and London students utilizes multivariate regression analyses and structural equation modeling as analytical methods.

measurementThere are negative correlations between sleep quality and performance on the Rey Auditory Verbal Learning Test (RAVLT) among university students in both Tokyo and London.

claimThe study aims to evaluate how academic stress, lifestyle choices (including exercise, social interactions, dietary patterns, and technology use before bed), and cultural factors (including societal expectations, educational systems, and parental influences) mediate or moderate the association between sleep quality and cognitive performance in university students in Tokyo and London.

perspectiveThe study authors recommend that interventions to improve student sleep quality should be culturally tailored, specifically by reducing academic pressure in Tokyo and addressing socioeconomic challenges in London.

claimThe Rey Auditory Verbal Learning Test (RAVLT) word lists were adapted for students in Tokyo to include culturally relevant items: Sakura (Cherry Blossom), Fuji (Mount Fuji), Sushi, Ramen, Temple, Shrine, Manga, Anime, Geisha, Kimono, Bullet Train, Subway, Karaoke, Robot, and Bonsai.

claimThe study investigated the impact of cultural factors on cognitive outcomes associated with sleep quality among students located in Tokyo and London.

measurementThe correlation between Pittsburgh Sleep Quality Index (PSQI) scores and RAVLT performance is −0.40 (p < 0.001) for students in Tokyo and −0.25 (p < 0.01) for students in London.

claimUnderstanding the dynamic of sleep quality and cognitive functions in Tokyo and London requires exploring the Stress-Performance Relationship, the relationship between stress and mental health, and the impact of sleep quality on cognitive functions and mental health.

measurementIn a moderation analysis of university students in Tokyo and London, the interaction between sleep quality (PSQI) and city on RAVLT performance showed a standardized regression coefficient (β) of -0.20 (p = 0.03), suggesting the relationship between sleep quality and verbal learning and memory is significantly different between the two cities.

claimA study examining the impact of sleep quality on cognitive functions among university students in Tokyo and London revealed significant negative associations between sleep quality and various cognitive domains.

measurementThe correlation between Pittsburgh Sleep Quality Index (PSQI) scores and RPM performance is −0.30 (p < 0.001) for students in Tokyo and −0.15 (p = 0.04) for students in London.

measurementThe study investigating the impact of sleep quality on cognitive functions included two participant groups: 200 individuals in Tokyo and 200 individuals in London.

claimThe fast-paced and demanding lifestyle in Tokyo may contribute to increased stress and cognitive overload, further impairing attentional performance among sleep-deprived university students.

measurementThe relationship between Pittsburgh Sleep Quality Index (PSQI) scores and Stroop Test performance does not differ significantly between Tokyo and London (β = −0.10, p = 0.21), suggesting the magnitude of the effect of sleep quality on attention and executive function is consistent across both cultural contexts.

claimThe study recommends developing culturally tailored interventions to improve sleep quality and cognitive performance for university students in Tokyo and London.

measurementThe study investigating sleep quality and cognitive function included 200 participants in Tokyo and 200 participants in London.

claimThe negative relationship between sleep quality and cognitive performance is more pronounced in Tokyo students compared to other groups, likely reflecting higher levels of academic stress and societal pressure.

measurementPoorer sleep quality, as measured by the Pittsburgh Sleep Quality Index (PSQI), is significantly associated with lower Raven's Progressive Matrices (RPM) non-verbal reasoning scores (β = −0.20, p < 0.001) across both Tokyo and London student populations.

measurementThe study participants had a mean age of 22.3 years in Tokyo and 22.7 years in London, with a gender distribution of 58% female and 42% male in Tokyo, and 52% female and 48% male in London.

measurementThe correlation between Pittsburgh Sleep Quality Index (PSQI) scores and Stroop Test performance is −0.35 in Tokyo and −0.20 in London.

measurementThe study participants were university students between the ages of 18 and 30 from Tokyo and London.

claimIn the cultural context of Tokyo, students often prioritize long study hours over sleep, which leads to disrupted memory consolidation and negatively impacts academic outcomes.

claimPoor sleep quality has a stronger negative impact on Rey Auditory Verbal Learning Test (RAVLT) performance in Tokyo students compared to London students.

claimThe study of 400 university students in Tokyo and London found significant negative correlations between Pittsburgh Sleep Quality Index (PSQI) scores and cognitive performance, indicating that poorer sleep quality correlates with diminished cognitive abilities across domains.

claimStudents in London possess more flexible sleep-wake patterns compared to students in Tokyo, which allows them to maintain better circadian alignment and protect their cognitive function.

measurementThe effect of city location on Raven's Progressive Matrices (RPM) performance is not statistically significant (β = 0.10, p = 0.10), and the interaction between PSQI scores and city location on RPM performance is not significant (β = −0.05, p = 0.32), indicating the relationship between sleep quality and non-verbal reasoning is consistent across Tokyo and London.

measurementUniversity students in Tokyo scored lower on the Rey Auditory Verbal Learning Test (RAVLT) with a mean of 53.8 (SD = 8.0) compared to university students in London, who scored a mean of 56.6 (SD = 8.8).

measurementStudents in London scored significantly higher on cognitive measures, including verbal learning, memory, attention, executive function, non-verbal reasoning, and cognitive flexibility, compared to students in Tokyo (p < 0.01).

claimThe authors of the article 'Investigating the impact of sleep quality on cognitive functions among students in Tokyo, Japan, and London, UK' (Ampofo et al., 2025) state that all claims expressed in the article are solely those of the authors and do not necessarily represent the views of their affiliated organizations, the publisher, the editors, or the reviewers.

claimIn Tokyo, intense academic pressure and cultural stigma surrounding mental health issues create a high-risk environment for students, often leading to untreated conditions that compromise sleep quality and cognitive function.

measurementThe correlation between Pittsburgh Sleep Quality Index (PSQI) scores and Rey Auditory Verbal Learning Test (RAVLT) performance is −0.40 in Tokyo and −0.25 in London.

claimThe demanding academic environment in Tokyo, which requires maintaining focus and concentration for extended periods, may make students particularly vulnerable to the negative effects of sleep deprivation on attentional control and interference inhibition.

claimThe impact of sleep quality on cognitive functions, as measured by correlations between Pittsburgh Sleep Quality Index (PSQI) scores and cognitive assessments, is more pronounced among students in Tokyo compared to students in London.

measurementThe mean age of the study participants was 22.3 ± 2.7 years for the Tokyo group and 22.7 ± 2.9 years for the London group.

claimA study investigating university students in Tokyo, Japan, and London, UK, found significant negative associations between sleep quality (measured by the Pittsburgh Sleep Quality Index) and cognitive performance across domains including verbal learning and memory (RAVLT), attention and executive function (Stroop Test), non-verbal reasoning (RPM), and cognitive flexibility (WCST).

referenceThe study emphasizes the essential impact of sleep quality on cognitive functioning in university students and identifies notable cultural differences between Tokyo and London that affect sleep patterns and mental health outcomes.

claimThe study suggests that unique stressors and cultural factors experienced by university students in Tokyo may exacerbate the negative effects of sleep deprivation on memory consolidation processes.

claimIn Tokyo, the stringent academic environment and high societal expectations place immense pressure on students, contributing to chronic stress and anxiety.

measurementThe interaction term between sleep quality (measured by the Pittsburgh Sleep Quality Index) and city location (Tokyo vs. London) on Wisconsin Card Sorting Test (WCST) performance resulted in β = −0.12 and p = 0.09, indicating the result is not statistically significant at the conventional p < 0.05 level.

Sex differences in respiratory and circulatory cost during hypoxic ... nature.com Nature Jul 2, 2019 4 facts

procedureThe study used a motor-driven treadmill (Aero Walker 2200, Combi Wellness Co, Ltd., Tokyo, Japan) for all experiments.

procedureThe study used a hypoxic gas generator system (Everest summit II, Will Co. Ltd., Tokyo, Japan) to continuously blend hypoxic gas, which was delivered from a 200-liter Douglas bag.

measurementThe study measured heart rate (HR) using a POLAR RC800X monitor (POLAR Electro, Tokyo, Japan) and monitored oxygen saturation (SpO2) using a TM-2564G pulse oximeter (A&D, Tokyo, Japan) on the left middle finger.

procedureResting respiratory function was assessed using a spirometer (CHESTGRAPH HI-105T, Chest, Tokyo, Japan).

U.S.-China Relations in 2024: Managing Competition without Conflict csis.org CSIS Jan 3, 2024 1 fact

claimAdvanced market democracies including Tokyo, Berlin, Brussels, and Washington have developed increasingly similar analyses regarding the economic and national security challenges posed by China.

Unlocking the Potential of Generative AI through Neuro-Symbolic ... arxiv.org arXiv Feb 16, 2025 1 fact

referenceQingyao Cui, Yanquan Zhou, and Mingming Zheng authored the paper 'Sememes-based framework for knowledge graph embedding with comprehensive-information', published in the proceedings of the 14th International Conference, KSEM 2021, in Tokyo, Japan, August 14–16, 2021, by Springer.

Understanding epistemology and its key approaches in research cefcambodia.com Koemhong Sol, Kimkong Heng · Cambodian Education Forum Jan 21, 2023 1 fact

claimPropositional knowledge is defined as the knowledge of facts or the awareness that something is the case, such as knowing that Tokyo is the capital of Japan or that Barack Obama was the 44th president of the United States.

Tracking Trump's Trade Deals | Council on Foreign Relations cfr.org Inu Manak, Allison J. Smith · Council on Foreign Relations Mar 17, 2026 1 fact

perspectiveJoshua Kurlantzick, CFR senior fellow for Southeast Asia and South Asia, stated: “The Indonesia deal commits Jakarta to roll back a number of significant nontariff barriers in a move that defies its traditionally protectionist approach … while Jakarta, Manila, and Tokyo have taken home what they portray as tariff ‘wins,’ their deals are massively unpopular with their respective publics.”