December 2001
Volume 1, Issue 3
Vision Sciences Society Annual Meeting Abstract  |   December 2001
The time course in perceptual organization: An EEG study
Author Affiliations
  • B. Rokers
    UCLA, Los Angeles, CA, USA
  • F. Fang
    Beijing University, Beijing, China
  • H. Pan
    Cornell University, Ithaca, NY, USA
  • B. M. Bly
    Rutgers University-Newark, Newark, New Jersey, USA
  • Z. Liu
    UCLA, Los Angeles, CA, USA
Journal of Vision December 2001, Vol.1, 397. doi:
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      B. Rokers, F. Fang, H. Pan, B. M. Bly, Z. Liu; The time course in perceptual organization: An EEG study. Journal of Vision 2001;1(3):397. doi:

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

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Purpose. In order to find empirical evidence for top-down cortical feedback in relation to the neural mechanisms of perceptual organization, we studied the stereokinetic effect. When rotated in the same plane, two eccentric rings initially appear to move relative to each other in that plane. Soon a 3D, mutating truncated cone is perceived, in which the two rings appear to be in different planes, but at the same time move rigidly relative to each other. This effect vividly demonstrates that perceptual organization is at work in “slow motion.” We studied brain activity elicited by this stimulus with EEG because of its high temporal resolution. Methods. A stereokinetic stimulus was presented during EEG recording. Subjects pressed a button as soon as they perceived a vivid 3D structure. The button press was aligned with EEG recordings. With counterbalancing, eight stimuli were presented to each of the 12 subjects. Results. The average activity in secondary visual areas sharply rises 600ms before the button press. This activity reversed in polarity after button press and was sustained for as long as 2600ms. Our preliminary analysis indicated that mechanisms underlying perceptual organization are relatively slow acting learning processes, instead of quick activity based processes.

Rokers, B., Fang, F., Pan, H., Bly, B.M., Liu, Z.(2001). The time course in perceptual organization: An EEG study [Abstract]. Journal of Vision, 1( 3): 397, 397a,, doi:10.1167/1.3.397. [CrossRef]
 Supported by NSF IBN-9817979.

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