In the current consensus, fixational eye movements contribute to maintain visibility, by continuously stimulating neurons in the early visual areas of the brain, which mostly respond to transient stimuli. In the absence of retinal jitter (a laboratory condition called retinal stabilization), the visual percept rapidly fades out and may even completely disappear under certain conditions (low contrast, absence of sharp edges, etc.).
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Fixational Eye Movement
Fixational eye movements (also known as fixational instability, retinal jitter) are small, involuntary eye movements that occur during visual fixation. There are three categories of fixational eye movements: microsaccades, ocular drifts, and ocular microtremor. Fixational eye movements were found in a number of species, including humans, other primates, cats, rabbits, turtles, salamanders, owls, etc. Although their existence has been known since the 1950s, the role and importance of fixational eye movements is still debated.
In the current consensus, fixational eye movements contribute to maintain visibility, by continuously stimulating neurons in the early visual areas of the brain, which mostly respond to transient stimuli. In the absence of retinal jitter (a laboratory condition called retinal stabilization), the visual percept rapidly fades out and may even completely disappear under certain conditions (low contrast, absence of sharp edges, etc.).
In the current consensus, fixational eye movements contribute to maintain visibility, by continuously stimulating neurons in the early visual areas of the brain, which mostly respond to transient stimuli. In the absence of retinal jitter (a laboratory condition called retinal stabilization), the visual percept rapidly fades out and may even completely disappear under certain conditions (low contrast, absence of sharp edges, etc.).
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