An examination of the variables that affect express saccade generation.
Schiller PH, Haushofer J, Kendall G
Vis Neurosci. 2004 Mar-Apr;21(2):119-27.
The frequency with which express saccades are generated under a variety of conditions
in rhesus monkeys was examined. Increasing the gap time between fixation spot
termination and target onset increased express saccade frequency but was progressively
less effective in doing so as the number of target positions in the sample was
increased. Express saccades were rarely produced when two targets were presented
simultaneously and the choice of either of which was rewarded; a temporal asynchrony
of only 17 ms between the targets reinstated express saccade generation. Express
saccades continued to be generated when the vergence or pursuit systems was coactivated
with the saccadic system.