The pupil as a measure of emotional arousal and autonomic activation.

  title={The pupil as a measure of emotional arousal and autonomic activation.},
  author={Margaret M. Bradley and Laura S. Miccoli and Miguel A. Escrig and Peter J. Lang},
  volume={45 4},
Pupil diameter was monitored during picture viewing to assess effects of hedonic valence and emotional arousal on pupillary responses. Autonomic activity (heart rate and skin conductance) was concurrently measured to determine whether pupillary changes are mediated by parasympathetic or sympathetic activation. Following an initial light reflex, pupillary changes were larger when viewing emotionally arousing pictures, regardless of whether these were pleasant or unpleasant. Pupillary changes… 

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