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Journal of Vision (2002) 2, 627-644 http://journalofvision.org/2/9/5/ 627 Primacy of spatial information in guiding target
 

Summary: Journal of Vision (2002) 2, 627-644 http://journalofvision.org/2/9/5/ 627
Primacy of spatial information in guiding target
selection for pursuit and saccades
Scott A. Adler Salk Institute for Biological Studies, La Jolla, CA, USA
Jagdeep Bala Salk Institute for Biological Studies, La Jolla, CA, USA
Richard J. Krauzlis Salk Institute for Biological Studies, La Jolla, CA, USA
Previous studies have examined the facilitative effects of prior spatial information on target selection for saccadic eye
movements. More recently, studies have shown that prior spatial information also influences target selection for smooth
pursuit. However, direct comparisons of the effects of prior information on target selection for pursuit and saccades have
not been made. To this end, we provided different classes of prior information and measured their effects on target
selection for pursuit and saccades. In Experiment 1, we assessed the relative effects of spatial cues (indicating the target
stimulus' initial location) and color cues (indicating the target stimulus' color) on eye movement latencies. In Experiment 2,
we assessed the effects of motion cues (indicating the target stimulus' direction of motion) in addition to spatial cues. For
both pursuit and saccades, we found that spatial cues reduced eye movement latencies more than color cues
(Experiment 1). Spatial cues also reduced eye movement latencies more than motion cues (Experiment 2), even for
pursuit, despite the fact that stimulus motion is essential for the generation of pursuit eye movements. These results
indicate that both pursuit and saccades are affected to a greater degree by spatial information than motion or color
information. We suggest that the primacy of spatial information for both pursuit and saccades reflects the importance of
spatial attention in selecting the stimulus target for both eye movements.
Keywords: eye movements, information cues, attention, spatial, motion, saccades, pursuit

  

Source: Adler, Scott A. - Centre for Vision Research & Department of Psychology, York University (Toronto)
Krauzlis, Richard J. - Systems Neurobiology Laboratories, Salk Institute for Biological Studies

 

Collections: Biology and Medicine