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Assimilation: central and peripheral effects

C M de Weert1, N A van Kruysbergen

  • 1Nijmegen Institute for Cognition and Information (NICI), University of Nijmegen, The Netherlands. deweert@nici.kun.nl

Perception
|January 1, 1997
PubMed
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Perceptual assimilation reduces perceived differences, while contrast enhances them. This study localizes assimilation effects in the visual system, finding they occur beyond binocular separation, suggesting central processing.

Area of Science:

  • Visual Perception
  • Neuroscience
  • Psychophysics

Background:

  • Assimilation and contrast are fundamental perceptual phenomena with opposing effects on perceived differences.
  • The precise neural locus of these effects within the perceptual system remains elusive.
  • Understanding assimilation's localization is key to deciphering visual processing mechanisms.

Purpose of the Study:

  • To investigate the spatial localization of assimilation effects within the human visual system.
  • To differentiate between early visual processing stages and later, more central mechanisms.
  • To explore how manipulating noise properties influences the strength and perception of assimilation.

Main Methods:

  • Experimental manipulation of spatial noise properties, including binocular disparity and motion.

Related Experiment Videos

  • Quantification of assimilation strength under varying noise conditions.
  • Utilizing binocular disparities to probe depth-plane separation and its impact on masking.

    • Main Results:

    • Masking effects of spatial noise were reduced when the noise was presented with binocular disparity.
    • This suggests that assimilation effects, at least partially, occur at a stage beyond binocular separation in depth.
    • Peripheral similarity in images influenced perceived assimilation, further supporting central processing involvement.

    Conclusions:

    • Assimilation effects are not solely confined to early visual processing stages like binocular separation.
    • Evidence points towards a significant contribution of central neural mechanisms in mediating assimilation.
    • Further research using noise manipulation can refine our understanding of perceptual localization.