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A ventrorostral belt is adjacent to the guinea pig primary auditory cortex
M N Wallace1, R G Rutkowski, A R Palmer
1MRC Institute of Hearing Research, University Park, Nottingham, UK.
Neuroreport
|July 29, 1999
Abstract:
The previously defined anterior area (A) of guinea pig auditory cortex has been divided into a large dorsal portion identified as the primary area (AI) and a smaller ventrorostral belt (VRB). This division is based on: (1) the much longer response latency of units in VRB (21.7 ms) than AI (14.1 ms); (2) the absence of pure onset units in VRB (i.e. units that lacked a sustained response), which are common in AI; (3) the weakness of noise-induced evoked potentials in VRB compared to AI; (4) units in VRB had lower thresholds and stronger phase locking to amplitude modulated stimuli than in AI.