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The ontogeny of spontaneous skin potential responses in kittens.

The evolution of frequency and amplitude of spontaneous skin potential responses (SPRs) was studied in kittens from birth to 30 days. Results showed that: i) at birth, electrodermal activity is very low, and significantly lower than in adults; ii) the evolution of electrodermal activity is rapid, the adult level being reached by the end of the third week. Frequency and amplitude evolve at approximately the same rate; iii) SPRs recorded on the forepaw were significantly more frequent and larger than those for the hindpaw up to 13 days; iv) changes in electrodermal activity as a function of sleep and waking showed that sleep is characterized by a moderate decrease of SPR amplitude and by a pronounced decrease in SPR frequency. The results are discussed in terms of maturation of the central nervous system.