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• W1639455067 abstract "We investigated whether the monkey superior colliculus (SC), an important midbrain structure for the regulation of saccadic eye movements, contains neurons with activity patterns sufficient to control both the cancellation and the production of saccades. We used a countermanding task to manipulate the probability that, after the presentation of a stop signal, the monkeys canceled a saccade that was planned in response to an eccentric visual stimulus. By modeling each animal's behavioral responses, with a race between GO and STOP processes leading up to either saccade initiation or cancellation, we estimated that saccade cancellation took on average 110 msec. Neurons recorded in the superior colliculus intermediate layers during this task exhibited the discharge properties expected from neurons closely involved in behavioral control. Both saccade- and fixation-related discharged differently when saccades were counter-manded instead of executed, and the time at which they changed their activity preceded the behavioral estimate of saccade cancellation obtained from the same trials by 10 and 13 msec, respectively. Furthermore, these intervals exceed the minimal amount of time needed for SC activity to influence eye movements. The additional observation that saccade-related neurons discharged significantly less when saccades were countermanded instead of executed suggests that saccades are triggered when these neurons reach a critical activation level. Altogether, these findings provide solid evidence that the superior colliculus contains the necessary neural signals to be directly involved in the decision process that regulates whether a saccade is to be produced." @default.
• W1639455067 created "2016-06-24" @default.
• W1639455067 creator A5041894266 @default.
• W1639455067 creator A5062078798 @default.
• W1639455067 date "2003-07-23" @default.
• W1639455067 modified "2023-10-17" @default.
• W1639455067 title "Controlled Movement Processing: Superior Colliculus Activity Associated with Countermanded Saccades" @default.
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• W1639455067 doi "https://doi.org/10.1523/jneurosci.23-16-06480.2003" @default.
• W1639455067 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6740637" @default.
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