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Effects of attention on visual motio...

Rezec, Amira A.

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Effects of attention on visual motion processing.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Effects of attention on visual motion processing./
Author:	Rezec, Amira A.
Description:	148 p.
Notes:	Source: Dissertation Abstracts International, Volume: 65-01, Section: B, page: 0476.
Contained By:	Dissertation Abstracts International65-01B.
Subject:	Psychology, Psychobiology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3119178
ISBN:	0496665766

Effects of attention on visual motion processing.
Rezec, Amira A.

Effects of attention on visual motion processing. - 148 p.

Source: Dissertation Abstracts International, Volume: 65-01, Section: B, page: 0476.

Thesis (Ph.D.)--University of California, San Diego, 2004.

Research has shown that directing spatial attention to a motion stimulus or attending to a particular feature of a motion stimulus significantly alters the processing of that stimulus. In recent years, more interest has focused on learning how attention influences motion processing.

ISBN: 0496665766Subjects--Topical Terms:

1017821
Psychology, Psychobiology.

Effects of attention on visual motion processing.
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020 $a 0496665766
035 $a (UnM)AAI3119178
035 $a AAI3119178
040 $a UnM $c UnM
100 1 $a Rezec, Amira A. $3 1939726
245 1 0 $a Effects of attention on visual motion processing.
300 $a 148 p.
500 $a Source: Dissertation Abstracts International, Volume: 65-01, Section: B, page: 0476.
500 $a Chair: Karen R. Dobkins.
502 $a Thesis (Ph.D.)--University of California, San Diego, 2004.
520 $a Research has shown that directing spatial attention to a motion stimulus or attending to a particular feature of a motion stimulus significantly alters the processing of that stimulus. In recent years, more interest has focused on learning how attention influences motion processing.
520 $a A current debate exists regarding how, and to what degree, attention influences a particular type of motion processing---red/green (chromatic) motion. It has been argued that attentional mechanisms play a more prominent role in chromatic, as opposed to achromatic, motion processing. Some even argue that chromatic motion perception is mediated entirely by a higher level attentional motion mechanism that relies on salience cues. Studies 1 and 2 psychophysically investigated the degree to which chromatic motion is mediated by lower- versus higher-level visual mechanisms and tested the salience-based hypothesis. Our results show that top-down attention clearly enhances motion strength and does so equally for chromatic and achromatic stimuli, even in the absence of salience cues for chromatic motion. Salience manipulations alone had little influence on chromatic motion perception, suggesting chromatic motion is not entirely mediated by an attentional salience-based mechanism.
520 $a Attention has also been suggested to exert its effects by altering effective stimulus contrast, as does prolonged visual adaptation. Study 3 investigated the relationship between attention and adaptation and the role of stimulus contrast in motion processing by measuring the strength of perceived motion strength (assessed by motion after effect duration) under the presence or absence of top-down spatial attention. Our data show that attention increases perceived motion strength over a wide range of stimulus contrasts and appears to alter effective stimulus contrast. Additionally, our data suggest that attention acts to enhance the contrast gain effects of adaptation. We present a model that can account for our data and predicts these effects in cortical motion area MT.
520 $a These studies all provide further insight into the mechanism by which attention influences both chromatic and achromatic motion processing.
590 $a School code: 0033.
650 4 $a Psychology, Psychobiology. $3 1017821
650 4 $a Psychology, Experimental. $3 517106
690 $a 0349
690 $a 0623
710 2 0 $a University of California, San Diego. $3 1018093
773 0 $t Dissertation Abstracts International $g 65-01B.
790 1 0 $a Dobkins, Karen R., $e advisor
790 $a 0033
791 $a Ph.D.
792 $a 2004
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3119178