Chopped infra-red light is beamed at the iris and pupil and the infra-red light reflected gathered by a photo-transistor. A continuous pen recording of changes in reflectance is obtained which can be related to changes in pupil size.
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References
1.
DrischelH.Untersuchungen ueber die Dynamik des Lichtreflexes der menschlichen Pupille. Pflueg. Arch. ges. Physiol., 1957, 264, 145–168.
2.
HessE. H.PoltJ. M.Pupil size as related to interest value of visual stimuli. Science, 1960, 132, 349–350.
3.
HessE. H.PoltJ. M.Pupil size in relation to mental activity during simple problem-solving. Science, 1964, 143, 1190–1192.
4.
HessE. H.SeltzerA. L.ShlienJ. M.Pupil response of hetero- and homosexual males to pictures of men and women. J. abnorm. Psychol., 1965, 70, 165–168.
