Understanding Pitch Perception as a Hierarchical Process with Top-Down Modulation
Figure 3
Responses of autocorrelation models with fixed time constants.
(A) Response of the cascade autocorrelation model [13]; left plot: to the sequence of random tones shown in Figure 2A, and right plot: to the alternating click train shown in Figure 8A. (B) Response of short-term integration stage of the cascaded model (corresponding to the second stage of the current model, A2(t,l), when the feedback modulation of the integration times, equation 8, is switched off); see text for further explanation. As in panel A, the left panel shows the response to the tone sequence and the right panel shows the response to the click train (arrows mark the reported pitches). Different colours show activation strength as a percentage of the maximum response, as in Figure 2.