[The tonotopic organization of the ventrorostral zone of the cortical auditory area AII in the cat].
Tonotopic organization of the ventrorostral (VR) zone of cortical acoustic area AII was studied in acute nembutal-anaesthetized cats. Majority (92%) of VR zone neurons were able to respond selectively to the tones of specific frequencies. 54% of neurons had sharp tuning to one best frequency (BF), while 38% had several (2-3) BFs; 8% of the studied neurons had no BF. Certain correlation has been determined between localization of a unit in the VR zone and value of its BF. Neurons with the highest BFs were located in the caudal part of this zone. A successive decrease of BFs of units occurred in parallel with a shift along the VR zone rostrally from the high-frequency focus. Length of the VR projection zone of the AII was found to be 1.8-2.0 mm. Localization of this zone with respect to cortical sulci varied substantially in different animals.
Galaziuk
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D000161:Acoustic Stimulation / Q000379:methods; D000818:Animals; D001303:Auditory Cortex / Q000166:cytology / Q000502:physiology*; D002415:Cats; D005072:Evoked Potentials, Auditory / Q000502:physiology; D009474:Neurons / Q000166:cytology / Q000502:physiology*
Chastotnotopicheskaia organizatsiia ventrorostral'noĭ zony slukhovoĭ oblasti AII kory mozga koshki.