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Attention, Perception, & Psychophysics

, Volume 76, Issue 2, pp 367–382 | Cite as

Early top-down control over saccadic target selection: Evidence from a systematic salience difference manipulation

  • Harriet GoschyEmail author
  • A. Isabel Koch
  • Hermann J. Müller
  • Michael Zehetleitner
Article

Abstract

Previous research on the contribution of top-down control to saccadic target selection has suggested that eye movements, especially short-latency saccades, are primarily salience driven. The present study was designed to systematically examine top-down influences as a function of time and relative salience difference between target and distractor. Observers performed a saccadic selection task, requiring them to make an eye movement to an orientation-defined target, while ignoring a color-defined distractor. The salience of the distractor was varied (five levels), permitting the percentage of target and distractor fixations to be analyzed as a function of the salience difference between the target and distractor. This analysis revealed the same pattern of results for both the overall and the short-latency saccades: When the target and distractor were of comparable salience, the vast majority of saccades went directly to the target; even distractors somewhat more salient than the target led to significantly fewer distractor, as compared with target, fixations. To quantify the amount of top-down control applied, we estimated the point of equal selection probability for the target and distractor. Analyses of these estimates revealed that, to be selected with equal probability to the target, a distractor had to have a considerably greater bottom-up salience, as compared with the target. This difference suggests a strong contribution of top-down control to saccadic target selection—even for the earliest saccades.

Keywords

Attentional capture Eye movements Visual attention 

Notes

Acknowledgements

This research was supported by grants from DFG Excellence Cluster EC 142 ‘CoTeSys’ (H. J. M and M. Z.), the DFG research group FOR480 (H. J. M.), DFG grant ZE 887/3-1 (M. Z. and H. J. M.), and the German–Israeli Foundation for Scientific Research and Development grant 1130–158.4 (M. Z. and H. J. M.).

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Copyright information

© Psychonomic Society, Inc. 2013

Authors and Affiliations

  • Harriet Goschy
    • 1
    • 2
    Email author
  • A. Isabel Koch
    • 1
    • 2
  • Hermann J. Müller
    • 1
    • 3
  • Michael Zehetleitner
    • 1
  1. 1.Department of PsychologyLudwig-Maximilians-Universität MünchenMunichGermany
  2. 2.Graduate School of Systemic NeurosciencesPlanegg-MartinsriedGermany
  3. 3.Birkbeck CollegeUniversity of LondonLondonUK

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