International journal of psychophysiology : official journal of the International Organization of Psychophysiology
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Int J Psychophysiol · Mar 2004
Clinical TrialThe fear-inhibited light reflex: importance of the anticipation of an aversive event.
It has been shown previously that the amplitude of the pupillary light reflex response decreases when subjects anticipate an aversive stimulus (i.e. electric shock), compared to periods when subjects are resting ('fear-inhibited light reflex'). ⋯ The increase in initial pupil diameter is related to the anticipation of any stimulus, whereas the decrease in the amplitude of the light reflex response is associated with the aversiveness of the anticipated stimulus.