If you see furrows (labelled 3 above), then, watch out, I’m impulsive. Look closely for ‘crypts’ in my eyes (lines going away from the iris, labelled 1 above) and this suggests I’m a warm, tender-minded person. If you look closely at the coloured part of my eye, the iris, you might even get some clues as to my personality ( Larsson et al., 2007). This one is not strictly related to pupil dilation, but it’s too good to leave out. They generally look for dilated pupils to either less than 3mm or dilated to more than 6.5mm ( Richman et al. Police officers know this and some use it as one way of checking if someone is off their face.
Others, like amphetamine, cocaine, LSD and mescaline cause dilated pupils. Some drugs, like alcohol and opioids cause the pupils to constrict. …and you can narrow down the type by looking at my pupils. Imagine what you could do to my pupils if you plugged me into the mains. At maximum intensity the pupils dilated by about 0.2mm.īut that was only to a relatively tame current. (1999) fired small electric shocks into people’s fingertips and measured how much their pupils dilated. If you’ve had enough of this article now and want to cause me some pain in return, then why not stab me with a pencil? If you’re watching closely you’ll see my pupils dilate.Ĭhapman et al. Conservatives showed the opposite pattern. The liberals’ pupils dilated when they saw fellow liberals Johnson and King but constricted when they saw conservative Wallace. Should you happen to be carrying around pictures of politicians you might be able to work out whether I’m a liberal or a conservative just from my pupil size.īarlow (1969) showed people pictures of Lyndon Johnson, George Wallace and Martin Luther King, Jr. First people’s pupils dilated because of the shock and then they constricted to try and avoid the troubling images. Hess (1972) showed people pictures of injured children. Just as I have dilated pupils when I’m interested or turned on, so they constrict when I’m disgusted. It tends to get tested by showing nude pictures to people and some argue that we’re just really interested in the nude form. However, not everyone agrees dilated pupils are a signal of sexual arousal. If things take a sexual turn then our eyes are also involved. Both men and women’s get dilated pupils when they are sexually aroused (e.g. I’m likely to be interested in anything new, so my pupils will dilate a bit at first, but they’ll only stay dilated if I continue to be interested. But they only remained wide for the passages that were erotic or involved mutilation. Their pupils widened at first for all three. White and Maltzman (1977) had participants listening to excerpts from three books: one was erotic, another involved mutilation while a third was neutral. You’re holding my interestĭilated pupils can also signal whether I’m interested in what you’re saying. There may well be other extremely subtle clues, like the blood pouring from my head. If my brain is broken, say, because I’ve had a bump on the noggin, you won’t see PERRL. They use the acronym PERRL: the Pupils should be Equal, Round and Reactive to Light. The reason doctors and paramedics flash a light in patients’ eyes is to check their brains are working normally (and because it’s such an easy test to do).
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