Abstract
Response to oral nipple stimulation was studied in human infants as a function of their prestimulation arousal levels. The general procedure consisted of a five-minute baseline period followed by 15 seconds of stimulation. Level of arousal was assessed by observational and stabilimetric ratings over corresponding time samples. In the initial study, the direction and magnitude of activity change was found to vary inversely with the pre-stimulus arousal level. Succeeding studies replicated the initial findings and indicated that convergence of activity at an intermediate level during intraoral stimulation could not be explained on the basis of spontaneous activity cycles, the influence of stimulation per se, or procedural artifact. The phenomenon was discussed in terms of the “law of initial values.”
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