Microsaccades parameters in special visual tasks E Luniakova, A Garusev |
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Faculty of Psychology, Lomonosov Moscow State University, Russian Federation
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| Microsaccades parameters were investigated in three different types of visual tasks: 1) the sustained fixation task; 2) the preparing for oculomotor task (gaze redirection on three different distances); 3) the two-points visual acuity task. In the oculomotor task participants were asked to fixate the target in its first position in the center of the display and then to direct their gaze as accurately as possible to its second location and hold fixation until the end of the trial. Second target location was changed randomly from trial to trial and was in one of eight angular positions with one of three eccentricities: 75, 280 or 485 arcmin. A cue (a grey circle around the target in first position) indicating a predetermined eccentricity of a subsequent target location was presented 2000 ms before target displacement in 2/3 of trials. In the two-points visual acuity task participants were asked to discriminate two points with angular sizes from 1 to 4 arcmin and the same angular distances. Preliminary analysis did not reveal significant difference between microsaccades amplitude and velocity values in three types of the visual tasks. |
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