Researchers report the size of the pupil fluctuates during sleep. The findings may indicate that pupil size can indicate specific sleep states.
Pupil dilation is at its largest when people are most uncertain about their situation, a new study reports.
Personal involvement and emotional content of music influences pupillary response, researchers report.
According to a new study, how much a child's pupils dilate in response to seeing an emotional image can predict their risk of developing depression over the next two years.
