Unilateral Neglect of Representational Space

Bisiach, Edoardo; Luzzatti, Claudio

doi:10.1016/s0010-9452(78)80016-1

Cited by 1,147 publications

(455 citation statements)

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“…Intriguingly, the disorder of spatial neglect is not restricted to physical space, but also affects the generation and/or exploration of mental images (Bisiach and Luzzatti, 1978). Thus, when neglect patients describe familiar places, maps or other geographical facts from memory, they may fail to name left-sided, but not right-sided landmarks of the imagined spatial layout (e.g., Bartolomeo, D'Erme et al, 1994;Meador, Loring et al, 1987;Rode, Rossetti et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

Lucky numbers: Spatial neglect affects physical, but not representational, choices in a Lotto task

Loetscher

Nicholls

Towse

et al. 2010

Cortex

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Lucky numbers: Spatial neglect affects physical, but not representational, choices in a Lotto task Loetscher, T; Nicholls, M E; Towse, J N; Bradshaw, J L; Brugger, P Loetscher, T; Nicholls, M E; Towse, J N; Bradshaw, J L; Brugger, P (2010). AbstractSpatial neglect can be characterized by a "magnetic attraction" towards the right side of a visual stimulus array and a selection of stimuli from that hemispace. This study examined whether these distinctive characteristics in visuo-motor space are also evident in representational number space. Given that numbers are thought to be represented along a leftto-right oriented mental number line, an affinity for the spontaneous selection of larger numbers was anticipated for neglect patients. Contrary to this expectation, neglect patients (n=20) picked a similar range of numbers compared to controls (n=17) when generating a number between 1,000 and 10,000 and when playing an imaginary lottery game. There was, however, a positive correlation between the biases for the imaginary lottery, number generation and a number bisection task -demonstrating that exploration asymmetries along the mental number line are consistent within individuals across tasks. Some of the patients selected smaller numbers in all of these tasks, confirming reports of dissociations between physical and numerical-representational forms of neglect. Conversely, only four (20%) of the patients could reliably be classified as demonstrating a neglect in number space. When filling out a physical lottery ticket, the neglect patients showed the expected bias towards picking numbers placed on the right-hand side of the ticket. These results demonstrate that the magnetic attraction towards the right side of mental representations is rather weak and that representational forms of neglect only occasionally co-exist with neglect in physical space.

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Section: Introductionmentioning

confidence: 99%

Lucky numbers: Spatial neglect affects physical, but not representational, choices in a Lotto task

Loetscher

Nicholls

Towse

et al. 2010

Cortex

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“…Data supporting allocentric and egocentric frames of reference stem from the classic work of Bisiatch and Luzzatti (1978). These authors asked PC-lesioned patients to recall the layout of the Piazza del Duomo in Milan, Italy.…”

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confidence: 99%

Lesions of the dorsal hippocampus or parietal cortex differentially affect spatial information processing.

Rogers

Kesner

2006

Behavioral Neuroscience

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The present experiments used 2 versions of a modified Hebb-Williams maze to test the role of the dorsal hippocampus (dHip) and parietal cortex (PC) in processing allocentric and egocentric space during acquisition and retention. Bilateral lesions were made to either the dHip or PC before maze testing (acquisition) or after maze testing (retention). The results indicate that lesions of the dHip impair allocentric maze acquisition, whereas lesions of the PC impair egocentric maze acquisition. During retention, lesions of the PC produced a significant impairment on both maze versions, whereas lesions of the dHip produced short-lived, transient impairments on both maze versions. These results suggest that during acquisition, the hippocampus and PC process spatial information in parallel; however, long-term retention of spatial information requires the PC with the dHIP as necessary for retrieval and/or access but not necessarily storage.

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“…Again, the neglected half is not simply out of sight, but has ceased to exist: patients behave as if it had never existed. As in the experiment by Bisiach and Luzzati (1978), the permanence of the object must in some way be disrupted.…”

Section: Discussionmentioning

confidence: 94%

“…In a famous experiment by Bisiach and Luzzati (1978), two patients with right hemisphere lesions were asked to imagine themselves at one end of a well-known square and describe all the places of business on the plaza. They failed to recall shops, cafes, etc., on the left.…”

Section: Discussionmentioning

confidence: 99%

Object temporal connotation

Becchio

Bertone

2003

Brain and Cognition

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Recent studies show that what connotes an object is first of all a certain spatio-temporal structure. In this paper we describe some of the temporal features characterizing the temporal structure of objects: pre-existence, persistence, conservation of identity in spite of perceptive discontinuity, surviving changes in colour, size, and shape. We argue that time is an indispensable attribute for every type of object and briefly discuss the implication of this view with respect to a specific neuropsychological syndrome: unilateral spatial neglect.

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Unilateral Neglect of Representational Space

Cited by 1,147 publications

References 0 publications

Lucky numbers: Spatial neglect affects physical, but not representational, choices in a Lotto task

Lucky numbers: Spatial neglect affects physical, but not representational, choices in a Lotto task

Lesions of the dorsal hippocampus or parietal cortex differentially affect spatial information processing.

Object temporal connotation

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