title: A ventrorostral belt is adjacent to the guinea pig primary auditory cortex.
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.
authors.affiliation: MRC Institute of Hearing Research, University Park, Nottingham, UK.
authors.forename: M N
authors.initials: MN
authors.lastname: Wallace
authors.forename: R G
authors.initials: RG
authors.lastname: Rutkowski
authors.forename: A R
authors.initials: AR
authors.lastname: Palmer
mesh_terms: D000818:Animals; D001303:Auditory Cortex / Q000502:physiology*; D001931:Brain Mapping; D005072:Evoked Potentials, Auditory / Q000502:physiology; D006168:Guinea Pigs; D008839:Microelectrodes; D011930:Reaction Time / Q000502:physiology