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London and Tokyo are linked as the two primary study sites for a cross-sectional research project investigating the impact of sleep quality on cognitive functions among university students [1], [2]. The study compares these two locations to analyze how distinct cultural contexts, academic pressures, and lifestyle factors influence the relationship between sleep patterns and cognitive performance [3], [4], [5].
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Investigating the impact of sleep quality on cognitive functions ... frontiersin.org 128 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.
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).
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.
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.
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.
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).
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 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).
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.
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.
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.
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.
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.
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.
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).
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.
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 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.
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.
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.
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.
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 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.
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.