How do target predictability and precueing affect the production of express
saccades in monkeys?
Schiller PH, Haushofer J, Kendall G
Eur J Neurosci. 2004 Apr;19(7):1963-8.
The extent to which target predictability and precueing affect express saccade
generation was determined in Rhesus monkeys. Target predictability, as manipulated
by the probability with which targets appeared at various locations, had a strong
influence on express saccade generation. Pre-cueing the location of the appearance
of an impending single target with an identical stimulus was effective in increasing
express saccade generation when there was a gap of 50-150 ms between fixation
spot termination and target onset. However, precueing was not effective when the
gap time was set to 0 ms in the single target task, when several simultaneous
targets appeared requiring a visual discrimination to be made using an oddity
task, or when the precue was not identical to the target. These findings indicate
that express saccades are facilitated by a restricted set of conditions that increase
the predictability of target location and identity.