PMID: 8459273Feb 1, 1993Paper

Organization of response areas in ferret primary auditory cortex

Journal of Neurophysiology
S A ShammaH Versnel

Abstract

1. We studied the topographic organization of the response areas obtained from single- and multiunit recordings along the isofrequency planes of the primary auditory cortex in the barbiturate-anesthetized ferret. 2. Using a two-tone stimulus, we determined the excitatory and inhibitory portions of the response areas and then parameterized them in terms of an asymmetry index. The index measures the balance of excitatory and inhibitory influences around the best frequency (BF). 3. The sensitivity of responses to the direction of a frequency-modulated (FM) tone was tested and found to correlate strongly with the asymmetry index of the response areas. Specifically, cells with strong inhibition from frequencies above the BF preferred upward sweeps, and those from frequencies below the BF preferred downward sweeps. 4. Responses to spectrally shaped noise were also consistent with the asymmetry of the response areas. For instance, cells that were strongly inhibited by frequencies higher than the BF responded best to stimuli that contained least spectral energy above the BF, i.e., stimuli with the opposite asymmetry. 5. Columnar organization of the response area types was demonstrated in 66 single units from 16 penetrations. Consistent...Continue Reading

Citations

Mar 1, 1995·The European Journal of Neuroscience·B H Gaese, J Ostwald
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Apr 9, 1999·Human Brain Mapping·D A HallR W Bowtell
Nov 24, 1999·Journal of Neurophysiology·M L SutterW C Loftus
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Sep 15, 2005·The Journal of the Acoustical Society of America·Taishih ChiShihab A Shamma
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