Allocentric neglect strongly associated with egocentric neglect

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• 作者：Christopher Rorden^a ; ^{rorden@sc.edu} ; Haukur Hjaltason^b ; Paul Fillmore^c ; Julius Fridriksson^c ; Olafur Kjartansson^b ; Sigridur Magnusdottir^b ; Hans-Otto Karnath^a ; ^d
• 关键词：Allocentric ; Egocentric ; Object-based ; Reference frame ; Spatial neglect ; Brain damage ; Human
• 刊名：Neuropsychologia
• 出版年：2012
• 出版时间：May, 2012
• 年：2012
• 卷：50
• 期：6
• 页码：1151-1157
• 全文大小：765 K

文摘

Following brain injury, many patients experience egocentric spatial neglect, where they fail to respond to stimuli on the contralesional side of their body. On the other hand, allocentric, object-based neglect refers to the symptom of ignoring the contralesional side of objects, regardless of the objects?egocentric position. There is an established tradition for considering these two phenomena as both behaviorally and anatomically dissociable. However, several studies and some theoretical work have suggested that these rather reflect two aspects of a unitary underlying disorder. Furthermore, in a recent large study reported that acute allocentric neglect is only observed in cases where substantial egocentric neglect is also present. In a new sample of right hemisphere stroke patients, we attempted to control for potential confounds by using a novel continuous measure for allocentric neglect (in addition to a recently developed continuous measure for egocentric neglect). Our findings suggest a strong association between egocentric and allocentric neglect. Consistent with the work of , we found allocentric behavioral deficits only in conjunction with egocentric deficits as well as a large corresponding overlap for the anatomical regions associated with egocentric and with allocentric neglect. We discuss how different anatomical and behavioral findings can be explained in a unified physiologically plausible framework, whereby allocentric and egocentric effects interact.