Fig. 8.

RPI distribution for tonotopic and nontonotopic penetrations. A: average RPI at each depth, relative to the first auditory recording within the penetration, for tonotopic (red) and nontonotopic (blue) penetrations. Error bars indicate SE. Distributions of RPI in tonotopic and nontonotopic penetrations (B) overlapped, although tonotopic penetrations generally showed more sustained (i.e., lower RPI) responses. The trend persisted when data from monkeys not showing tonotopy were excluded (blue broken line) or when the shallowest recordings were excluded (red broken line).