Abstract
Two-dimensional eye movements of seven subjects (five naive and two not naive) were recorded by the search coil technique while they aimed and shot a rifle and threaded a sewing needle. Four of the naive subjects, who made microsaccades (mean size = 7′) while they fixated (2/sec). made fewer (1.2/sec) and larger (mean = 14′) while shooting and threading. The other naive subject made very few microsaccades during fixation (0.2/sec) and also during shooting and threading. Frequently (60–70%), he made no saccades whatsoever while completing these tasks. The performance of our experienced subjects was similar. We conclude that microsaccades are neither important or necessary for the succesful completion of finely guided visuomotor tasks. We also found that naive subjects, who ordinarily make saccades frequently during fixation, can suppress them (0.5/sec) easily with minimal instruction.
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