Reynald is taking part in a study where he is observing a dot of light in a pitch-black environment. It eventually seems to be moving. He learns later that it was actually still. The autokinetic effect is the name given to this phenomena.
The autokinetic effect, also known as autokinesis, is a visual perception phenomenon where a still, small point of light in a dark or featureless environment gives the impression that it is moving. The reason why it happens is probably because motion perception is always based on a reference point. There is no point of reference in the dark or in an environment devoid of features, therefore the movement of the single point is ill-defined.
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