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When difficult decisions have to be made: dilating the pupil reveals the uncertainty

When difficult decisions have to be made: dilating the pupil reveals the uncertainty



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Study shows: dilation of the pupil reveals uncertainty
If a person is not sure about his decision, his pupils dilate. Scientists from Hamburg found out. However, dilating the pupil can tell even more about the person concerned.

When people make mistakes when making simple decisions
Researchers at the University Medical Center Hamburg-Eppendorf (UKE) have found that the pupils dilate when people are unsure when making a decision. And before you get any feedback about the correctness of the decision. As the scientists report in a clinic report, the pupils react most strongly when people make mistakes when making a simple decision.

Predict behavior change based on eyes
In addition, the experts were able to use the pupil reaction to predict a change in behavior: "If the pupil was dilated shortly after a decision was made, the more likely that the next decision was less influenced by previous decisions," the message says.

In order to arrive at their results, the team led by Prof. Dr. Tobias Donner from the Institute of Neurophysiology and Pathophysiology at the UKE looked at 27 test subjects on a screen over which two clouds of dots were moving.

While the test subjects indicated which of the two cloud movements was stronger, the neuroscientists measured the pupils with a video camera.

The results of the study have now been published in the journal "Nature Communications".

Pupil dilation reveals sexual orientation
The dilation of the pupils can tell even more about a person. For example, a few years ago US researchers reported a study that showed that dilating the pupil at the sight of the preferred gender reveals sexual orientation.

The researchers at Cornell University in Ithaca found that heterosexual people dilated their pupils when they looked at people of the opposite sex.

In homosexual subjects, the researchers observed the same reaction when looking at same-sex and bisexuals showed dilation of the pupils in both men and women. (ad)

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