ELECTROPHYSIOLOGICAL CORRELATES OF GUSTATORY CROSS ADAPTATION

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Abstract
Electrophysiological recordings of cross adaptation in the chorda tympani nerve of the rat were obtained for all possible pairs of 17 salts, HCl, quinine hydrochloride, and sucrose, at concentrations chosen to produce equal neural responses. The initial transient phase of the summated whole nerve response to a salt could be eliminated or reduced following adaptation of the tongue to other salts. Salts with common cations cross adapted more than those with different cations. The effects of cross adaptation were strikingly similar to those seen in human psychophysical studies and, in addition, closely paralleled Erickson's across-fiber correlations between responses to pairs of salts. The data appear to be compatible with either an across-fiber pattern or a ‘labelled-line’ view of taste quality coding.

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