The auditory area of the cat's cortex was mapped by recording evoked potentials to complex repetitive acoustic patterns, which produce in human Ss the experience of a pitch related to the periodicity of stimulus envelope fluctuation. The locus, amplitude, and latency of response appear to be directly related to the frequency spectrum of the stimulus. Thus, periodicity pitch is presumably not represented in terms of spatial patterning at the cortical level. (PsycINFO Database Record (c) 2006 APA, all rights reserved)