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Cumulative effects of continuous stimulation on arousal level in infants.

BRACKBILL, YVONNE. Cumulative Effects of Continuous Stimulation on Arousal Level in Infants. CHILD DEVELOPMENT, 1971, 42, 17-26. This study questioned whether level of arousal decreases as an inverse function of the number of sensory modalities continuously stimulated. 24 1-month-old infants served as Ss under 5 different conditions: no extra stimulation (control condition) and continuous stimulation of 1, 2, 3, and 4 sensory modalities. The 4 types of stimulation were auditory, visual, proprioceptive-tactile (swaddling), and temperature. Indices of arousal level included state, heart rate, respiration regularity, and gross motor activity. Results reaffirmed the pacifying effect of continuous stimulation, indicated that the effect is not restricted to 1 sensory modality but is instead a general characteristic of sensory stimulation in early development, and, finally, demonstrated that the pacification effect is indeed cumulative across modalities. Theoretical and practical aspects of these results are discussed.