Original sentence: Although their existence has been known since the 1950s, the role and importance of fixational eye movements is still debated.Experiments in neurophysiology from different laboratories have shown that fixational eye movements, particularly microsaccades, strongly modulate the activity of neurons in several visual areas of the macaque brain.Fixational eye movements were found in a number of species, including humans, other primates, cats, rabbits, turtles, salamanders, owls, 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.There are three categories of fixational eye movements: microsaccades, ocular drifts, and ocular microtremor.Visual fixation is never perfectly steady: fixational eye movements occur involuntarily
Edited sentence: Although their existence has been known since the 1950s, the role and importance of fixational eye movement is still debated.Experiments in neurophysiology from different laboratories have shown that fixational eye movement, particularly microsaccades, strongly modulate the activity of neurons in several visual areas of the macaque brain.Fixational eye movement has been found in a number of species, including humans, other primates, cats, rabbits, turtles, salamanders, owls.In the current consensus, fixational eye movement contributes to maintaining visibility, by continuously stimulating neurons in the early visual areas of the brain, which mostly respond to transient stimuli.There are three categories of fixational eye movemens: microsaccades, ocular drifts, and ocular microtremor.Visual fixation is never perfectly steady: fixational eye movement occurs involuntarily