A black dot in the midst of the eye can tell researchers whether you are lying or not - and about plenty of other mental processes.
The technology of eye tracking is present in fields such as psychology, music research, and criminology. By measuring how the pupils dilate and diminish in different situations, researchers gain an insight into humans' emotions and cognitive processes.
For instance, eye tracking has taught researchers about children's language skills. By showing a small child a picture of a cat, while at the same time pronouncing another word - such as "ball" - changes in the size of the pupils may reveal whether the child understands the word.
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