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Bilateral interactions in saccade programming. A saccade-latency study

¹Laboratory of Experimental Psychology, University of Leuven, Belgium. cavegn@psy.unibe.ch

Experimental Brain Research

|May 1, 1996

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Location cues facilitate express saccades (fast, ~100ms reaction) when valid. Invalid cues abolish express saccades, demonstrating attentional effects on eye movements.

Area of Science:

Neuroscience
Cognitive Psychology
Ophthalmology

Background:

Saccades are rapid eye movements crucial for visual exploration.
Express saccades, occurring around 100ms, are a distinct type of visually guided saccade.
The role of attention and fixation mechanisms in saccade generation is complex.

Purpose of the Study:

To investigate how visual attention allocation influences the generation of express saccades.
To examine the impact of valid and invalid location cues on saccade latencies and characteristics.
To test the predictions of a fixation-gating model for saccade control.

Main Methods:

Participants performed visually guided saccades to peripheral targets.
Location cues (valid or invalid) preceded target onset to direct attention.

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Experiments included gap and overlap conditions, with peripheral and central cues.

Saccade latency, amplitude, and transition functions were analyzed.

Main Results:

Valid cues facilitated express saccades (~100ms latency).
Invalid cues abolished express saccades, yielding slower fast-regular saccades (~150ms latency).
Continuous amplitude transitions were observed when saccades were initiated towards the cued, but not the target, location.

Conclusions:

Visual attention and saccade preparation strongly modulate saccade generation, particularly express saccades.
The fixation-gating model effectively explains the observed multimodal saccade latency distributions.
Antagonism between fixation and saccade systems, influenced by attention, underlies these findings.