Abstract
ABSTRACTRespiratory and non‐nutritive sucking responses to auditory stimulation were studied in 1‐ to 5‐day old human newborns. Each S was presented 5 stimuli, each 4 times, during 4 sessions at 24 hour intervals. The stimuli varied in intensity and intermittency. Stimulus onset and offset shortened sucking bursts during Sessions I‐III, but in Session IV stimulus offset lengthened sucking bursts. In general, respiration was accelerated by stimulus onset and decelerated by stimulus offset. However, in Session IV respiratory deceleration occurred to both stimulus onset and offset. Respiratory deceleration also occurred to low intensity stimuli in Sessions I‐III. Respiratory acceleration and sucking inhibition were discussed as components of the newborn's defense reaction (DR) to most stimulation. Respiratory deceleration was related to appearance of orienting reaction (OR) after habituation of DR. Ss' respiratory responsivity and sucking responsivity were highly correlated.
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