Abstract

The effects of auditory stimulation on pupil size and the pupil light reflex were investigated in 33 male volunteers. A 95dB tone caused pupillary dilation and a reduction in the amplitude of the light reflex. Although the light reflex amplitude was positively correlated with pupil size in the resting state the effects of noise on the two measures were independent since the pupillary dilation response showed a marked habituation after two presentations of the tone whereas the effect on the light reflex remained the same. People showing high impulsivity scores on the EPQ tended to have smaller pupils (i.e. low arousal). There was also a relationship between impulsivity and light reflex amplitude, but this was probably a secondary consequence of the relationship between the latter measure and pupil size in the resting state.

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