Distributed representation of perceptual categories in the auditory cortex (Kim and Bao 2008)

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Accession:113459
Examines the hypothesis that enlargement in cortical stimulus representation is a mechanism of categorical perception. Categorical perception is tested using discrimination and identification ability.
Reference:
1 . Kim H, Bao S (2008) Distributed representation of perceptual categories in the auditory cortex. J Comput Neurosci 24:277-90 [PubMed]
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Model Information (Click on a link to find other models with that property)
Model Type: Realistic Network;
Brain Region(s)/Organism: Auditory cortex;
Cell Type(s):
Channel(s):
Gap Junctions:
Receptor(s):
Gene(s):
Transmitter(s):
Simulation Environment: MATLAB;
Model Concept(s): Perceptual Categories; Audition;
Implementer(s): Bao, Shaowen [sbao at berkeley.edu]; Kim, Heesoo [heesoo at berkeley.edu];
function LL = likhood (freq)
% function LL = likhood(freq)
%
% Equation number 2 in the paper.
% Helper function for discrimination_MLE and categorization_llikhd.m
% fre and cf in the range of 1 to 30 kHz; bw in Octaves max_amp in
% spikes/stimulus
%
% Bao Lab

global CFs bw spkrate spont R;
freq = log2(freq);
cf = log2(CFs);
bws=bw;
bws(find(bw==0))=1;
RR=spkrate.*exp(-(freq-cf).^2./(2*bws.^2));
LL=-1*sum(R.*log(RR+spont)-RR-spont);