Pooled neural firing encodes stimulus period as spike intervals.

Evidence

Taken collectively, the firing pattern of multiple auditory nerve fibers provides a code for the period of a stimulus, as the temporal separation between spikes is always a multiple of the stimulus period. The temporal separation between the pooled spikes corresponds to the period. — Jennifer Lentz, Psychoacoustics- Perception of Normal…, 1210

Categorization

• XREF: This is the volley theory mechanism in action — complements the Wever-Bray theory described two paragraphs earlier. — connects to: Neural information is encoded in the patterning of voltage spikes — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 566; Neurons firing irregularly across harmonics reveal the fundamental period — David Howard, Jamie Angus, coustics and Psychoacoustics, 923