Abstract
The reaction times of visually guided saccades (SRT) were analyzed in different conditions. Very short saccadic reaction times (express saccades) of 100–130 ms measured from the appearance of the target were obtained, if a spot of light, which the subject had to attend to, disappeared 200 ms before the saccade target appeared. Whether the attention target was presented foveally (thereby serving as a fixation point) or peripherally made little difference. Virtually only long SRT were observed in the presence of directed visual attention at the moment of target appearance. We conclude that directed (engaged) visual attention inhibits the execution of saccades and must be interrupted (disengaged) before a saccade can be made.
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