concept

pairwise phase consistency

Also known as: PPC, pairwise phase consistency metric

Facts (11)

Sources

Protocol for testing global neuronal workspace and integrated ... journals.plos.org PLOS ONE 6 facts

claimThe pairwise phase consistency metric is unbiased by the number of trials or spikes.

claimIntegrated Information Theory (IIT) requires that pairwise phase consistency increases to be greater than baseline during the stimulus duration window in higher-order and lower-order sensory region pairs and within sensory regions to pass its testing protocol.

referenceThe paper 'The pairwise phase consistency: a bias-free measure of rhythmic neuronal synchronization' was published by Vinck M, van Wingerden M, Womelsdorf T, Fries P, and Pennartz CMA in Neuroimage in 2010 (Volume 51, Issue 1, pages 112–122, PMID 20114076).

procedureIn the testing protocol, a Bayes Factor (BF) greater than 10 is interpreted as strong evidence for the alternative hypothesis (H1) that the difference in pairwise phase consistency is greater than baseline, while a BF less than 1/10 is interpreted as strong evidence for the null hypothesis (H0) that pairwise phase consistency is equal to baseline.

procedureResearchers use pairwise phase consistency between brain regions to evaluate changes in functional connectivity when testing theories of consciousness.

claimThe Global Neuronal Workspace Theory (GNWT) requires that pairwise phase consistency increases to be greater than baseline during the stimulus onset window in the prefrontal cortex (PFC) and posterior parietal cortex (PPC) pair, the PFC and sensory regions pair, and the PPC and sensory regions pair to pass its testing protocol.

Adversarial testing of global neuronal workspace and ... - Nature nature.com Nature Apr 30, 2025 5 facts

claimIn V1/V2 regions of interest, iEEG Pairwise phase consistency (PPC) analysis shows faces elicit stronger connectivity than objects for face-selective electrodes, and objects elicit stronger connectivity than faces for object-selective electrodes.

measurementMEG PPC analysis of task-irrelevant trials did not reveal any synchrony cluster in any region of interest after removing the evoked response.

claimiEEG Pairwise phase consistency (PPC) analysis of task-irrelevant trials reveals significant content-selective synchrony in V1/V2 regions of interest, but not in Prefrontal Cortex (PFC) regions of interest.

measurementiEEG PPC analysis of task-irrelevant trials did not reveal any significant category-selective synchrony cluster in posterior or PFC regions of interest after removing the evoked response.

measurementMEG PPC analysis of task-irrelevant trials with a sample size of 65 reveals significant category-selective synchrony below 25 Hz for face-selective GED filters in both V1/V2 and PFC regions of interest, and for object-selective synchrony in the PFC region of interest only.