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- W143948364 abstract "The eye movements of three human subjects have been measured when they made saccades to single targets at eccentricities between 0.3 and 15 degrees. If the fixation point disappeared 200 ms before a target at 4 degrees was presented (Gap condition), all subjects produced reasonable amounts of express saccades as indicated by a clear peak in the distribution of the saccadic reaction times (SRT) located at about 100 ms (Fischer & Ramsperger, 1984). The peak disappeared when the target eccentricity decreased below 2 degrees, but saccades of longer (regular) reaction times were still present. Thus it was found that there exists a dead zone for express saccades. Yet there was a clear gap effect for small saccades, i.e., the latencies were shortened when the fixation point was extinguished before the onset of the target (Gap condition) as compared to the Overlap condition where it remained visible throughout the trials. In addition, small saccades had a much stronger tendency to overshoot the target and their velocity falls above the main sequence as defined by the least square fit of an exponential v = vo [1 – exp(-a/ao)] to the maximal velocity (v) versus amplitude (a) relationship (vo and ao are constants fitted). It is concluded that for small saccades the express way is blocked functionally or does not exist anatomically." @default.
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- W143948364 date "1994-01-01" @default.
- W143948364 modified "2023-09-26" @default.
- W143948364 title "Reaction Time and Velocity of Small Saccades in Man" @default.
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- W143948364 doi "https://doi.org/10.1016/b978-0-444-81808-9.50013-5" @default.
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