Fig. 4.

Classifier performance by auditory field as a function of number of sites. The two-alternative forced choice classifier reached ceiling performance in all fields when greater than 20 sites are used, while performance was close to floor when single sites are used. For the analyses in this report, we used 5 sites per classifier run (marked by the vertical line) to achieve performance well above chance level while avoiding ceiling performance. Classifier was run in all instances using spike timing information: 1-ms temporal bins across a 40-ms analysis window.