Neuromagnetic Responses to Infrequent Changes in Periodicity Pitch
Periodic acoustic signals are perceived to have a pitch which does not depend on the spectral content of the sound. The existence of this kind of perception, usually called ‘periodicity pitch’, suggests that the temporal features of the sound, in addition to its spectral content, may form the basis for pitch detection (Langner, 1985; Warren and Bashford, 1988). Extraction of spectral information in the cochlea is explained by the ‘place principle’ (Pickles, 1988), and the tonotopic organization is retained also at the cortical level. There is no evidence of an analogous cortical place code for the temporal information involved in the periodicity pitch.
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