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.
No takes yet. Share an insight, caveat, or question.
Hess et al. (1960) studied this question.
Synapse has enriched 5 related papers. Consider them for comparative context: