Neuroscience 2004 Abstract
| Presentation Number: | 332.4 |
|---|---|
| Abstract Title: | Dissociation of spatial attention and saccade preparation during visual search. |
| Authors: |
Mebane, M. W.*1
; Shorter-Jacobi, S. M.1
; Sherwood, J. M.1
; Schall, J. D.1
1Ctr Integrative & Cognitive Neurosci., Vanderbilt Vision Res. Ctr, Dept of Psychology, Vanderbilt Univ., Nashville, TN |
| Primary Theme and Topics |
Cognition and Behavior - Human and Animal Cognition and Behavior -- Attention |
| Secondary Theme and Topics | Sensory Systems<br />- Vision<br />-- Visual cortex: Perception and action |
| Session: |
332. Attention: Cortical Mechanisms II Poster |
| Presentation Time: | Sunday, October 24, 2004 4:00 PM-5:00 PM |
| Location: | San Diego Convention Center - Hall A-H, Board # OO21 |
| Keywords: | frontal eye fields, target selection, eye movements, microstimulation |
To dissociate the focus of attention from the endpoint of a saccade, macaque monkeys were trained to perform visual search for a uniquely colored rectangle and shift gaze either toward or opposite this color singleton according to its orientation (vertical cued prosaccade; horizontal, antisaccade). During antisaccade trials most neurons in the frontal eye fields (FEF) initially select the singleton but then modulate to select the saccade endpoint (Sato & Schall, 2003 Neuron). Saccade preparation was probed by measuring the direction of saccades evoked by FEF intracortical microstimulation at variable times following presentation of the search array (Juan et al., SfN 2003). Critically, eye movements evoked on antisaccade trials never deviated toward the singleton but only toward the stimulus location opposite the singleton. In our original report the singleton appeared at only two of the four locations in the array, always orthogonal to the evoked saccade baseline, which resulted in negligible RT differences between pro- and antisaccades. Here we presented the singleton at all locations with equal probability. Antisaccade RTs were slower than for prosaccades. When the singleton was off the axis of the evoked saccade, the pattern of deviations in pro- and antisaccade trials was replicated; importantly, deviations on antisaccade trials were consistently biased toward the saccade endpoint, not the singleton. When the task saccade was opposite the evoked one, interactions were complex and more variable than when the task saccade was within 45 deg of the singleton. Deviations were significant only after the singleton shape and associated stimulus-response mapping rule were registered. Visual selection and saccade selection are distinct processes instantiated by different neurons located in common structures.
Supported by T32 EY08126, F32 EY14502, NSF 0218507, R01 EY08890 and P30 EY08126
Sample Citation:
[Authors]. [Abstract Title]. Program No. XXX.XX. 2004 Neuroscience Meeting Planner. San Diego, CA: Society for Neuroscience, 2004. Online.
Copyright © 2004-2026 Society for Neuroscience; all rights reserved. Permission to republish any abstract or part of any abstract in any form must be obtained in writing by SfN office prior to publication.
