Involuntary Maybe, But Certainly Not Random (IMAGE)
Caption
Your eyes on the move: When you stare at the central black dot for about a minute and then look at the white dot next to it, you will notice a dark afterimage of the white grid, which -- as a result of your own fixational eye movements -- keeps moving around. The existence of such involuntary eye movements has been known for several decades, but how the brain generates them has remained a scientific mystery.
Credit
Reproduced, with permission, from: F. J. Verheijen, A simple after image method demonstrating the involuntary multidirectional eye movements during fixation, J. Modern Optics, 1961, Taylor & Francis Group.
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