paracontrast

From para- +‎ contrast.

paracontrast (uncountable)

1. A visual phenomenon where the perceived brightness of a stimulus is reduced when it is preceded by an adjacent visual stimulus.
   • 1918, PHYSIOLOGICAL ABSTRACTS, volume III, THE PHYSIOLOGICAL SOCIETY (GREAT BRITAIN AND IRELAND), page 557:

     An apparatus for the demonstration of the phenomena of the time relations of visual stimuli, and of meta- and paracontrast.

   • 1989, Glyn W. Humphreys, Vicki Bruce, Visual Cognition: Computational, Experimental and Neuropsychological Perspectives, Psychology Press, page 123:

     Masking between non-overlapping stimuli is termed paracontrast when the mask precedes the target, and metacontrast then the mask follows the target (equivalent to forward and backward masking between overlapping stimuli).

   • 2014 June 12, Bruno G. Breitmeyer, The Visual (Un)Conscious and Its (Dis)Contents: A microtemporal approach, Oxford University Press, page 51:

     A particular type of forward masking, in which the target and mask are spatially nonoverlapping, as in metacontrast, is called paracontrast masking.

• paracontrast. (n.d.) Millodot: Dictionary of Optometry and Visual Science, 7th edition. (2009). Retrieved December 7 2024 from https://medical-dictionary.thefreedictionary.com/paracontrast