Understanding Pitch Perception as a Hierarchical Process with Top-Down Modulation
Figure 6
Response of the model to stimuli used in the Plack and White experiment [17].
(A) Stimulus waveform of a rapid sequence of two 20-ms complex tones (harmonics of 250 Hz) separated by a 8-ms silent gap (left panel) or a noise of similar root mean square level as the complex tones (right panel); after band pass filtering (5500–7500 Hz) and the addition of a white noise background. (B) Effective integration times, E2(t) (green solid line) and E3(t) (red dotted line) at the second and third stages of the model. (C) Response of the third stage of the model, A3(t,l), for the silent-gap condition (left panel) and noise-burst condition (right panel). Different colours represent activation strength as a percentage of the maximum response as in previous figures.