Abstract
ABSTRACTThe effects of tone intensity (60, 75, or 90 dB) on the amplitude and habituation of the pupillary dilation response were investigated using a between‐groups design (N = 72). Although pupillary dilation responses were elicited in all intensity conditions, neither response amplitude nor habituation was influenced by differences in stimulus intensity, and the response was insensitive to changes in intensity following the habituation series. Eighteen subjects in the 90dB group were retested and the reliability of the response was found to be low. In Experiment 2 (N = 30), the variability of pupillary activity was reduced with a low level of background illumination, but overall test‐retest reliability of the dilation response to 90dB tones was low. The insensitivity of the response to intensity manipulations, the rapid development of habituation, and the low test‐retest reliability of the response are clear limitations on the usefulness of the pupillary dilation response as an index of the orienting reflex to nonsignal stimulation.
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