By comparing the time course of each pupil dilation to the time it took participants to indicate that the motion had stopped, the researchers found astonishingly high correlations. Across the ...

In the laboratory, all test subjects were then also exposed to artificial light of different wavelengths (red, green, blue and white) and their pupil dilation was measured for comparability and ...

Swiss scientists developed a novel method of studying pupil dilation when they noticed their laboratory mice slept with their eyes open. It uses an infrared light to image the back of the eye. They ...