Depth AEP recording and averaging
Intracerebral AEPs were recorded from all leads of an electrode (using an extra-cephalic
reference looped around the neck) and were simultaneously amplified and bandpass
filtered 1 Hz–1.5 kHz. Recording epochs lasted 350 ms with a prestimulus time of 35 ms,
10 per cent of the epoch. Two trials of 100 samples were administered to each subject.
Variations (i.e. polarity inversions and/or changes in amplitude in AEPs) recorded from
155AB
CD
Figure 10.1Sagittal MRI sections show the trajectory of the Sylvian fissure in the (A) left and (B) right temporal
lobes. Note here the distinct shape of the end of the lateral sulcus (Sylvian fissure) on both sides (white arrows)
and the longer length of the left planum temporale in this right-handed patient. The three axesof the bicommis-
sural reference system (AC-PC, VAC, VPC) have been drawn. (C) The verticofrontal section shows the left Heschl’s
gyrus, and the black arrowindicates the trace of the electrode recorded from the auditory cortex. (D) On the
surface view, the arrowshows the impact point of the same electrode.