Left visuo-spatial neglect can be worse in far than in near space

Cowey, Alan; Small, Marian; Ellis, Simon J.

doi:10.1016/0028-3932(94)90152-x

Cited by 216 publications

(104 citation statements)

References 12 publications

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“…This finding demonstrated, for the first time in humans, that unawareness for stimuli can be restricted to a specific sector of space. The finding of the opposite dissociation (more severe neglect in far space than in near space) confirmed that, also for humans, far and near space can be separately coded by the brain (Cowey et al, 1994(Cowey et al, , 1999Vuillemieur et al, 1997) Interestingly, a recent PET study has confirmed the anatomical distinction between near and far space coding in humans (Weiss et al, 2000).…”

Section: Coding Of Far and Near Space In Humanssupporting

confidence: 56%

Coding of Far and Near Space in Neglect Patients

Berti

Smania²,

Allport

2001

NeuroImage

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Far (extrapersonal) and near (peripersonal) spaces are behaviorally defined as the space outside armreaching distance and the space within arm-reaching distance. Animal and human studies have shown that this behavioral distinction corresponds in the brain to a composite neural architecture for space representation. In this paper we discuss how the activation of the neural correlates of far and near space can be modulated by the use of tools that change the effective spatial relationship between the agent's body and the target object. When subjects reach for a far object with a tool, it is possible to show that far space is remapped as near. We shall also argue that space remapping may not occur when far space is reached by walking instead of using a tool.

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Section: Coding Of Far and Near Space In Humanssupporting

confidence: 56%

Coding of Far and Near Space in Neglect Patients

Berti

Smania²,

Allport

2001

NeuroImage

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“…Their patient, following a right-hemisphere stroke, showed marked left visual-spatial neglect on a line-bisection task in near space that was reduced when the task was carried out in far space. Cowey, Small, and Ellis (1994) and Vuilleumier, Valenza, Mayer, Reverdin, and Landis (1998) reported the opposite dissociation: more severe neglect in far space than in near space. Thus, based on these studies, one may conclude that the distinction between near and far space is not simply descriptive, but that the brain has different ways for coding the position of objects placed in different location with respect to body coordinates (see Shelton, Bowers, & Heilman, 1990 for further dissociations within the near space).…”

Section: Introductionmentioning

confidence: 94%

When Far Becomes Near: Remapping of Space by Tool Use

Berti

Frassinetti

2000

Journal of Cognitive Neuroscience

632

398

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Abstract& Far (extrapersonal) and near (peripersonal) spaces are behaviorally defined as the space outside the hand-reaching distance and the space within the hand-reaching distance. Animal and human studies have confirmed this distinction, showing that space is not homogeneously represented in the brain. In this paper we demonstrate that the coding of space as ''far'' and ''near'' is not only determined by the hand-reaching distance, but it is also dependent on how the brain represents the extension of the body space. We will show that when the cerebral representation of body space is extended to include objects or tools used by the subject, space previously mapped as far can be remapped as near. Patient P.P., after a right hemisphere stroke, showed a dissociation between near and far spaces in the manifestation of neglect. Indeed, in a line bisection task, neglect was apparent in near space, but not in far space when bisection in the far space was performed with a projection lightpen. However, when in the far space bisection was performed with a stick, used by the patient to reach the line, neglect appeared and was as severe as neglect in the near space. An artificial extension of the patient's body (the stick) caused a remapping of far space as near space. &

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“…As documented above, TPJ activity is necessary for computing self-location and visuo-spatial perspective, because it receives converging visual, tactile, proprioceptive and vestibular signals about body orientation with respect to the environment (Blanke & Arzy, 2005;Bottini et al, 2001;Lopez et al, 2008). The idea that we experience the world from a single visuo-spatial perspective, despite the fact that multiple reference frames are used to code external events, has recently been pointed out by philosophical (Bermúdez, 1998;Husserl, 1973Husserl, /1997, neurophysiological (see e.g., Colby, 1998;Rizzolatti, Fadiga, Fogassi, & Gallese, 1997), and neuropsychological research (see e.g., dissociation between neglect for personal, peripersonal and extrapersonal space; Bisiach, Perani, Vallar, & Berti, 1986;Cowey, Small, & Ellis, 1994;Halligan & Marshall, 1991). Multisensory integration Fig.…”

Section: The Body In the World: Self-locationmentioning

confidence: 99%

Bodily ownership and self-location: Components of bodily self-consciousness

Serino

Alsmith

Costantini

et al. 2013

Consciousness and Cognition

208

170

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a b s t r a c tRecent research on bodily self-consciousness has assumed that it consists of three distinct components: the experience of owning a body (body ownership); the experience of being a body with a given location within the environment (self-location); and the experience of taking a first-person, body-centered, perspective on that environment (perspective). Here we review recent neuroimaging studies suggesting that at least two of these components-body ownership and self-location-are implemented in rather distinct neural substrates, located, respectively, in the premotor cortex and in the temporo-parietal junction. We examine these results and consider them in relation to clinical evidence from patients with altered body perception and work on a variety of multisensory, body-related illusions, such as the rubber hand illusion, the full body illusion, the body swap illusion and the enfacement illusion. We conclude by providing a preliminary synthesis of the data on bodily self-consciousness and its neural correlates.

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Left visuo-spatial neglect can be worse in far than in near space

Cited by 216 publications

References 12 publications

Coding of Far and Near Space in Neglect Patients

Coding of Far and Near Space in Neglect Patients

When Far Becomes Near: Remapping of Space by Tool Use

Bodily ownership and self-location: Components of bodily self-consciousness

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