A recent theory has hypothesized that the brain works on the basis of encoding information as the intervals between the individual spikes in spike trains. The number of spikes in spike trains is thought to be a constant within a given species, and 22 spikes has been hypothesized for humans. Microscopic evidence that the hair cells of the human cochlea have 22 hairs each is thought to support the basic theory. This evidence, in conjunction with the assumptions of the basic theory, is used to provide an explanatory framework for the basis of neural coding of auditory frequency and amplitude.
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