THE ANALYSIS OF THE INCREMENTAL STIMULUS INTENSITY EFFECT UPON HABITUATION OF THE HUMAN SKIN RESISTANCE RESPONSE

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The effect of incremental stimulus intensity on the habituation and return of the skin resistance response (a component of the orienting response) was investigated, using humans as subjects. On habituation trials, two groups, one with gradually increasing intensity stimuli (G-Gr.) and the other with constant low intensity stimuli (L-Gr.), showed smaller response amplitudes than a group with the constant high intensity stimuli (H-Gr.) or the fourth group (R-Gr.) with the same intensity stimuli as G-Gr. but in a random order. On test trials, G-Gr. showed the smallest amount of responding among the four groups. The results were discussed in relation to Sokolov's neuronal model theory of the orienting response, and to Groves and Thompson's dual-process theory of habituation.
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