Pupil size as related to interest value of visual stimuli.

@article{Hess1960PupilSA,
  title={Pupil size as related to interest value of visual stimuli.},
  author={Eva Hess and J M Polt},
  journal={Science},
  year={1960},
  volume={132 3423},
  pages={349-50}
}
Increases in the size of the pupil of the eye have been found to accompany the viewing of emotionally toned or interesting visual stimuli. A technique for recording such changes has been developed, and preliminary results with cats and human beings are reported with attention being given to differences between the sexes in response to particular types of material. 

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