Pupil size predicts accuracy of decision, study

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Reliability with which people make decisions can be predicted by measuring pupil size, a new study revealed.

pupil size

According to the study conducted by Peter Murphy and colleagues at the Leiden University, the spontaneous, moment-to-moment fluctuations in pupil size predicted how a selection of participants varied in their successful decision-making. A larger pupil size indicated poorer performance, due to (more) variability in the decisions made during the exercises conducted in the study. The revealed that certain individuals who had the largest pupils overall found to be the least consistent in their decisions.

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The results were obtained by measuring pupil size before each segment of the task began and monitoring each participant’s subsequent performance in deciding which direction a cloud of dots was moving in. These results were then combined with a simple mathematical model that described how people make decisions.

These findings reveal that a person’s state of responsiveness, as measured by pupil size, is a key determinant of the variability of the decisions they make about the world around them. When hyper-responsive, the decision-making appears to be less reliable and will more likely lead to undesirable outcomes. Critically, the findings also open up areas for future researches to improve the precision with which people make decisions, to help achieve better outcomes from the choices that we make.

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So before you execute your decision, better ask your partner or friend to check the size of your pupils. The larger the pupils size are the higher the possibility to make wrong decision.

This study published on PLOS Computational Biology.

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