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  Attention and metacontrast: a unifying concept

Kirschfeld, K., & Kammer, T. (1998). Attention and metacontrast: a unifying concept. Poster presented at 1. Tübinger Wahrnehmungskonferenz (TWK 1998), Tübingen, Germany.

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 Creators:
Kirschfeld, K1, 2, Author              
Kammer, T1, 2, 3, Author              
Affiliations:
1Former Department Comparative Neurobiology, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497800              
2Max Planck Institute for Biological Cybernetics, Max Planck Society, Spemannstrasse 38, 72076 Tübingen, DE, ou_1497794              
3Department Human Perception, Cognition and Action, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497797              

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 Abstract: function of the interstimulus interval (ISI) between target and surrounding mask. We hypothesized that there might be an increase in latency of perception along with reduction of perceived intensity. We displayed two horizontal bars (in one line, height: 0.5 deg, width 3 deg) on a PC monitor, each for 25 ms with a variable ISI, the left one was presented first. To achieve maximal metacontrast there was no gap at the neighbored edges of the two bars. Subjects perceive two moving lines, both start at the left and seem to ‚grow‘ to the right. The motion seen in the right line is the well known line motion illusion, generated by cue induced visual focal attention (Steinemann et al. 1997). The motion illusion perceived in the left line is due to metacontrast. This conclusion is supported by the finding that the effect is strongest when the left line as a target is presented 40 - 80 ms before the right line acting as a mask. At equivalent time differences, metacontrast in classical paradigms is strongest. The motion illusion results from the fact that the degree of dimming and the prolongation of latency decreases as the distance separating target from mask increases. There is a close relationship between metacontrast and cue induced focal attention, both show, however, opposite actions: Focal attention intensifies perception of an object and reduces its latency of perception, whereas metacontrast diminishes intensity and prolongs latency.

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 Dates: 1998-02
 Publication Status: Published in print
 Pages: -
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 Rev. Type: -
 Identifiers: BibTex Citekey: 280
 Degree: -

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Title: 1. Tübinger Wahrnehmungskonferenz (TWK 1998)
Place of Event: Tübingen, Germany
Start-/End Date: 1998-02-27 - 1998-03-01

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Title: Visuelle Wahrnehmung: Beiträge zur 1. Tübinger Wahrnehmungskonferenz
Source Genre: Proceedings
 Creator(s):
Bülthoff, HH1, Editor            
Fahle, M, Editor            
Gegenfurtner, KR1, Editor            
Mallot, HA1, Editor            
Affiliations:
1 Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497794            
Publ. Info: Kirchentellinsfurt, Germany : Knirsch
Pages: - Volume / Issue: - Sequence Number: - Start / End Page: 143 Identifier: ISBN: 3-927091-40-5