Time-frequency analysis of subject 156's responses during self-vocalization and playback.
(A) MRI surface rendering of the left cerebral hemisphere showing the locations of all recording contacts and major sulci. In this figure, filled black circles denote contacts where significant decreases (p<.01, 0–500 msec post-stimulus) in high gamma band (HGB, 70–150 Hz) power occurred during self-vocalization (SV) compared to playback (PB). Red circles indicate contacts where significant increases in high gamma band power were observed during SV compared to PB. (B) Broad-band time-frequency analysis (2–250 Hz) of evoked responses recorded during SV. Individual panels display the power responses for each frequency band at each recording site (−.25 sec to 1 sec post-voice onset). The largest responses are seen to occur between 70–150 Hz. Thick gray lines represent the major sulci as labeled in A. (C) Time-frequency analysis of evoked responses recorded during the PB condition (LF-lateral fissure, STS-superior temporal sulcus, ITS-inferior temporal sulcus, TTS- transverse temporal sulcus).