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Express averaging saccades in monkeys.

I H Chou¹, M A Sommer, P H Schiller

¹Department of Brain and Cognitive Sciences, Massachusetts Institute of Technology, Cambridge 02139, USA. ihan@phy.ucsf.edu

Vision Research

|February 7, 2001

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Monkeys exhibit express averaging saccades, a fast gaze shift optimization, primarily when target selection is not required. Instructions to select a target significantly reduce these rapid, intermediate saccades.

Area of Science:

Neuroscience
Ophthalmology
Primate Behavior

Background:

Monkeys exhibit two saccade types: averaging and target-directed.
These saccades differ in latency, suggesting distinct underlying neural processes.
Express saccades, faster than regular ones, are thought to be suppressed by target selection.

Purpose of the Study:

Investigate the latency of averaging saccades in monkeys.
Focus on express averaging saccades and their inhibition by target selection.
Understand the role of express averaging saccades in gaze shifting.

Main Methods:

Studied saccade latency in five monkeys.
Recorded saccade endpoints and latencies under different conditions.
Varied stimulus presentation and instructions regarding target selection.

Related Experiment Videos

Main Results:

Express averaging saccades were frequent when no target selection was instructed.
When target selection was required (based on color), averaging saccades still occurred.
However, saccade endpoints shifted to bimodal distributions near targets, and express saccades were rare.

Conclusions:

Express averaging saccades represent a mechanism for optimizing gaze shifts in space and time.
Target selection processes can inhibit express averaging saccades.
The findings shed light on the neural control of gaze behavior in primates.