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Visually controlled matching of pattern movement

Perception & Psychophysics volume 51, pages 569–579 (1992)Cite this article

Abstract

Utrecht Biophysics Research Institute, Rijksuniversiteit Utrecht, Utrecht, The Netherlands Subjects were asked to match the speeds of two moving random-dot patterns seen through circular apertures. The speed of one pattern that moved horizontally toward the right of a computer screen changed continuously. The speed of this pattern represented the target. It was to be matched with the speed of the second pattern, which moved in the opposite direction. The subject controlled the speed of the second pattern by means of an isometric joystick. The distance between the apertures on the screen as well as the subject’s distance from the screen served as experimental parameters. In this way, the effects of both spatialand temporal transients of pattern speed on human tracking performance were studied. To avoid anticipation by the subject, the amplitude and the frequency of the target pattern speed changed pseudorandomly. The accuracy with which the subject performed the matching task was influenced by the mean pattern speed and the parameters of the visual field. Within lower velocity ranges, the subject’s sensitivity to the instantaneous speed differences varied according to Weber’s law. The cross-correlation of the velocity time courses decreased when the mean speed of the target pattern was increased. Two stimulus parameters had a strong influence on the modulation of the correlation value: (1) the angular size of the stimulus on the retina and (2) the retinal eccentricity of the stimulus.

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Affiliations

  1. Utrecht Biophysics Research Institute, Rijksuniversiteit Utrecht, Utrecht, The Netherlands

    R. Wüst, A. M. L. Kappers & J. J. Koenderink

Authors
  1. R. Wüst
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  2. A. M. L. Kappers
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  3. J. J. Koenderink
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Correspondence to R. Wüst.

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Wüst, R., Kappers, A.M.L. & Koenderink, J.J. Visually controlled matching of pattern movement. Perception & Psychophysics 51, 569–579 (1992). https://doi.org/10.3758/BF03211654

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  • DOI: https://doi.org/10.3758/BF03211654

Keywords

  • Field Size
  • Navigation Task
  • Target Pattern
  • Time Track
  • Noise Function