June 2006
Volume 6, Issue 6
Free
Vision Sciences Society Annual Meeting Abstract  |   June 2006
An electrophysiological measure of multiple object tracking
Author Affiliations
  • Trafton Drew
    University of Oregon
  • Edward K. Vogel
    University of Oregon
Journal of Vision June 2006, Vol.6, 771. doi:10.1167/6.6.771
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      Trafton Drew, Edward K. Vogel; An electrophysiological measure of multiple object tracking. Journal of Vision 2006;6(6):771. doi: 10.1167/6.6.771.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Numerous studies have shown that we are capable of tracking 4 or 5 moving objects simultaneously. In this study we examined an electrophysiological measure in humans that appears to reflect the tracking of multiple objects “online” during a trial. Subjects were shown a bilateral display of multiple moving objects and were asked to track the objects in a single hemifield for an occasional brief flicker of one of the tracked objects. We time-locked the ERPs to the onset of the moving objects and recorded throughout the trial. Approximately 400ms following the onset of the movement, we observe a sustained negative wave at electrode sites that were contralateral with respect to the hemifield the subject was tracking. This wave persisted throughout the entire trial and its amplitude increased as a function of the number of items the subject was tracking on a given trial (1, 2, or 4 items). Together, these results suggest that this activity reflects a neural mechanism for tracking multiple objects.

Drew, T. Vogel, E. K. (2006). An electrophysiological measure of multiple object tracking [Abstract]. Journal of Vision, 6(6):771, 771a, http://journalofvision.org/6/6/771/, doi:10.1167/6.6.771. [CrossRef]
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