Principal component analysis.

Three click train response parameters (VS max, maximum vector strength; FR max, maximum firing rate; CV min, minimum coefficient of variations for ISIs), three mutual information values (VS info; FR info, ISI info), and four basic receptive field parameters (CF, characteristic frequency; Q40, sharpness of tuning; Threshold, response threshold; Latency, minimum latency) were analyzed. Analysis was applied jointly to all sites of the three hemispheres. Total variance accounted for: 77.5%. Bold numbers: dominant factor loadings for each parameter. Five significant factors were identified (Bartlett's chi-square test; p<0.05).