Fig. 6

Memory recall induces an correlated increase in HFO detections and pupil size. (a) The recall showed pupil dilation before word vocalization and an increase on the HFO rates around the vocalization, significant Granger causality (* for p-value < 0.05) was found between the pupil dilation and increase of average HFO rates at 150 ms. (b) Coincident HFO detection events between the LFP channels peak around the same time of recalled word vocalization. Notice that this synchronous pattern of global activation is peaking 100 ms before the onset of verbalization, suggesting involvement in the memory retrieval processes. c) Pupil size around the time of the coincident HFO detection reveals progressive dilation, which directly associates the pupillometric and the electrophysiological activities.