The temporal modulation structure of illiterate versus literate adult speech - Fig 3

Phase synchronisation index (PSI) values by frequency band for delta-theta amplitude modulation bands (left panel) and theta-beta/low gamma amplitude modulation bands (right panel) for conversational speech recorded from illiterate, low literate and high literate adults. The x-axis indicates the spectral bands from which the amplitude modulations originate. The y-axis shows the PSI value. Error bars are in standard error of the mean.