Fig. 7

Temporal coordination of HFO bursts is associated with memory recall. (a) Raw LFP signal from an example channel in the occipital cortex reveals increased detection rate of individual HFO bursts right before beginning of verbalizing a freely recalled word. (b) (top) Raster plots summarize HFO bursts as point processes detected in 10 ms bins around the moment of recall across all occipital channels in this example patient. Notice that the increasing rate of HFO bursting leading up to the free recall is coordinated in time between multiple channels in the absence of any visual stimulation. (bottom) Summary of the increased HFO bursting across the occipital channels shows a peak of coordinated activity preceding recall verbalization.