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      Metacontrast masking and stimulus contrast polarity

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      Embargo Lift Date: 2009-10-01
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      Author
      Breitmeyer, B.
      Tapia, E.
      Kafalıgönül, Hulusi
      Öğmen, H.
      Date
      2008
      Source Title
      Vision Research
      Print ISSN
      0042-6989
      Publisher
      Elsevier
      Volume
      48
      Issue
      23-24
      Pages
      2433 - 2438
      Language
      English
      Type
      Article
      Item Usage Stats
      117
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      Abstract
      A recent report [Becker, M. W., & Anstis S. (2004). Metacontrast masking is specific to luminance polarity. Vision Research, 44, 2537–2543] of a failure to obtain metacontrast with target and mask stimuli of opposite contrast polarity is reexamined in an experiment that systematically varies not only stimulus contrast polarity but also target size and target-mask onset asynchrony (SOA). The results show that (a) although, as previously shown [Breitmeyer, B. G. (1978a). Metacontrast with black and white stimuli: Evidence of inhibition of on and off sustained activity by either on or off transient activity. Vision Research, 18, 1443–1448], metacontrast is weaker with stimuli of opposite contrast polarity, (b) substantial metacontrast can be obtained with targets and masks of opposite contrast polarity, especially (c) when the target is small. We conclude that Becker and Anstis’s failure to obtain metacontrast with stimuli of opposite contrast polarity is due to their use of a single, relatively large, SOA value.
      Keywords
      Metacontrast masking
      Backward masking
      Contrast polarity
      Brightness processing
      Contour processing
      Temporal dynamics
      Permalink
      http://hdl.handle.net/11693/53547
      Published Version (Please cite this version)
      https://doi.org/10.1016/j.visres.2008.08.003
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