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Spatial reference frames for visual ...

Schendel, Krista Lynn.

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Spatial reference frames for visual attention: Evidence from healthy and brain-damaged human adults.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Spatial reference frames for visual attention: Evidence from healthy and brain-damaged human adults./
Author:	Schendel, Krista Lynn.
Description:	178 p.
Notes:	Source: Dissertation Abstracts International, Volume: 62-07, Section: B, page: 3096.
Contained By:	Dissertation Abstracts International62-07B.
Subject:	Biology, Neuroscience. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3019047
ISBN:	0493307141

Spatial reference frames for visual attention: Evidence from healthy and brain-damaged human adults.
Schendel, Krista Lynn.

Spatial reference frames for visual attention: Evidence from healthy and brain-damaged human adults. - 178 p.

Source: Dissertation Abstracts International, Volume: 62-07, Section: B, page: 3096.

Thesis (Ph.D.)--University of California, Davis, 2001.

This work challenges the notion of separate object- and location-based attention mechanisms in humans by examining how various stimulus attributes elicit attentional orienting in different spatial reference frames. Part I tests the degree to which objects and locations have been adequately dissociated in previous studies of reflexive orienting to moving objects. Since previous studies have relied on objects that move together as a group, it was predicted that object-based effects may be restricted to cases in which moving objects maintain their positions relative to one another as they move. As predicted, traditional object-based exogenous cueing effects were observed when two objects moved in a way that was consistent with a transformation of the entire stimulus array, but not when the objects appeared to move more independently. The fact that exogenous cueing effects were not observed with all types of stimulus motion suggests that attention is not reflexively allocated to objects per se. Rather, reflexive attentional orienting appears to utilize various spatial reference frames, including ones that are stimulus-based. The second portion of this work investigates how stimulus factors such as rotation and object orientation influence attentional selection of a particular reference frame. Six right-hemisphere damaged patients with left neglect were studied. In short, the spatial biases of these patients were used to assess the degree to which attention was allocated within a particular reference frame under different stimulus conditions. Findings indicate that the perceived direction of rotation of a global stimulus element may affect the magnitude of viewer-based neglect. Moreover, for this subject population, it appeared that orientation information provided by local stimulus features had greater influence over reference frame selection than orientation information provided by a larger, global form. Together, these studies provide empirical evidence that stimulus rotation can have specific effects on the allocation of spatial attention in both normal and brain-damaged humans. Furthermore, the findings suggest that the posited dichotomy between object- and location-based attention effects may be more accurately described as a continuum of attentional behavior with spatial references frames being the common underlying factor.

ISBN: 0493307141Subjects--Topical Terms:

1017680
Biology, Neuroscience.

Spatial reference frames for visual attention: Evidence from healthy and brain-damaged human adults.
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100 1 $a Schendel, Krista Lynn. $3 1932976
245 1 0 $a Spatial reference frames for visual attention: Evidence from healthy and brain-damaged human adults.
300 $a 178 p.
500 $a Source: Dissertation Abstracts International, Volume: 62-07, Section: B, page: 3096.
500 $a Adviser: Lynn C. Robertson.
502 $a Thesis (Ph.D.)--University of California, Davis, 2001.
520 $a This work challenges the notion of separate object- and location-based attention mechanisms in humans by examining how various stimulus attributes elicit attentional orienting in different spatial reference frames. Part I tests the degree to which objects and locations have been adequately dissociated in previous studies of reflexive orienting to moving objects. Since previous studies have relied on objects that move together as a group, it was predicted that object-based effects may be restricted to cases in which moving objects maintain their positions relative to one another as they move. As predicted, traditional object-based exogenous cueing effects were observed when two objects moved in a way that was consistent with a transformation of the entire stimulus array, but not when the objects appeared to move more independently. The fact that exogenous cueing effects were not observed with all types of stimulus motion suggests that attention is not reflexively allocated to objects per se. Rather, reflexive attentional orienting appears to utilize various spatial reference frames, including ones that are stimulus-based. The second portion of this work investigates how stimulus factors such as rotation and object orientation influence attentional selection of a particular reference frame. Six right-hemisphere damaged patients with left neglect were studied. In short, the spatial biases of these patients were used to assess the degree to which attention was allocated within a particular reference frame under different stimulus conditions. Findings indicate that the perceived direction of rotation of a global stimulus element may affect the magnitude of viewer-based neglect. Moreover, for this subject population, it appeared that orientation information provided by local stimulus features had greater influence over reference frame selection than orientation information provided by a larger, global form. Together, these studies provide empirical evidence that stimulus rotation can have specific effects on the allocation of spatial attention in both normal and brain-damaged humans. Furthermore, the findings suggest that the posited dichotomy between object- and location-based attention effects may be more accurately described as a continuum of attentional behavior with spatial references frames being the common underlying factor.
590 $a School code: 0029.
650 4 $a Biology, Neuroscience. $3 1017680
650 4 $a Psychology, Experimental. $3 517106
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710 2 0 $a University of California, Davis. $3 1018682
773 0 $t Dissertation Abstracts International $g 62-07B.
790 1 0 $a Robertson, Lynn C., $e advisor
790 $a 0029
791 $a Ph.D.
792 $a 2001
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