The Fluff Test: A simple task to assess body representation neglect

Cocchini, Gianna; Beschin, Nicoletta; Jehkonen, Mervi

doi:10.1080/09602010042000132

Cited by 136 publications

(112 citation statements)

References 23 publications

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“…By contrast, the ability to use left personal space without difficulty can be seen in the context of severe left neglect of peripersonal space as assessed by visual search tasks where the targets are displayed within arm's reach [20]. This double dissociation of personal and peripersonal neglect suggests that distinct neuronal circuits underlie how the two spaces are represented in the human brain.…”

Section: Personal Spacementioning

confidence: 96%

“…Neglect of left personal space can occur without neglect of left peripersonal space [20,21].Typical manifestations of left personal neglect include failure to shave or groom the left side of the face, failure to adjust spectacles on the left side, and failure to notice the position of the left limbs and use them appropriately even when no significant motor weakness is present. By contrast, the ability to use left personal space without difficulty can be seen in the context of severe left neglect of peripersonal space as assessed by visual search tasks where the targets are displayed within arm's reach [20].…”

Section: Personal Spacementioning

confidence: 99%

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Spatial cognition: evidence from visual neglect

Halligan

Fink

Marshall

et al. 2003

Trends in Cognitive Sciences

503

274

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Recent work on human attention and representational systems has benefited from a growing interplay between research on normal attention and neuropsychological disorders such as visual neglect. Research over the past 30 years has convincingly shown that, far from being a unitary condition, neglect is a protean disorder whose symptoms can selectively affect different sensory modalities, cognitive processes, spatial domains and coordinate systems. These clinical findings, together with those of functional neuroimaging, have increased knowledge about the anatomical and functional architecture of normal subsystems involved in spatial cognition. We provide a selective overview of how recent investigations of visual neglect are beginning to elucidate the underlying structure of spatial processes and mental representations.Once considered a unitary syndrome, it is now accepted that visuospatial neglect results from the interplay of damage to several different cognitive processes [1,2]. Even within such relatively simple tasks as copying or spontaneous drawing, patients show many qualitatively distinct patterns of omission and distortion in 'left' space [3].Deficits of attention, intention, global-local processing, spatial memory and mental representation can all contribute to the clinical picture of neglect, which accordingly cannot be traced back to the disruption of a single supramodal process [1,4]. Many of the symptoms traditionally ascribed to left neglect share little in common other than a contra-lesional gradient of increasing impairment, with comparatively well -preserved performance on the ipsilesional (right) side of space [1,5].Although characterising and remediating the clinical condition [1,2,5] are clearly crucial, the primary interest for cognitive neuroscience is how conditions such as visual neglect can inform existing cognitive theory and functional anatomy. That an abnormal bias towards one side of space can exist in the absence of contralateral peripheral sensory or motor loss (e.g. visual field losses or hemi-paralysis) suggests that impairment to higher level processes must be involved. The standard approach taken by cognitive neuropsychology characterises complex mental processes as information-processing systems with separate but interconnected components. Some of the informationprocessing stages involved in visual object recognition (see Fig. 1) illustrate the potential levels and links where lateralised deficits can arise after brain damage.This model charts the processing routes from preattentive assignment of simple structural features (i.e. without the need for focused attention and conscious awareness) to post-attentional integration of local and global processing (involving selective attention and conscious awareness) and the assignment of relevant spatial frames of reference prior to recognition and naming.

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Section: Personal Spacementioning

confidence: 96%

Section: Personal Spacementioning

confidence: 99%

Spatial cognition: evidence from visual neglect

Halligan

Fink

Marshall

et al. 2003

Trends in Cognitive Sciences

503

274

View full text Add to dashboard Cite

show abstract

“…Bisiach personal neglect assessment is a proprioceptive identification task in which the patient is asked to locate one hand with the other (Bisiach et al, 1986). The fluff task is a visuospatial test of personal neglect (Cocchini et al, 2001). The patient is blindfolded, and six cotton balls are placed on the contralesional side of the patient's body.…”

Section: Methodsmentioning

confidence: 99%

Anatomical Correlates of Directional Hypokinesia in Patients with Hemispatial Neglect

Sapir¹,

Kaplan²,

He³

et al. 2007

J. Neurosci.

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Unilateral spatial neglect (neglect) is a syndrome characterized by perceptual deficits that prevent patients from attending and responding to the side of space and of the body opposite a damaged hemisphere (contralesional side). Neglect also involves motor deficits: patients may be slower to initiate a motor response to targets appearing in the left hemispace, even when using their unaffected arm (directional hypokinesia). Although this impairment is well known, its anatomical correlate has not been established. We tested 52 patients with neglect after right hemisphere stroke, and conducted an anatomical analysis on 29 of them to find the anatomical correlate of directional hypokinesia. We found that patients with directional hypokinesia had a lesion involving the ventral lateral putamen, the claustrum, and the white matter underneath the frontal lobe. Most importantly, none of the patients without directional hypokinesia had a lesion in the same region. The localization of neglect's motor deficits to the basal ganglia establishes interesting homologies with animal data; it also suggests that a relative depletion of dopamine in the nigrostriatal pathway on the same side of the lesion may be an important pathophysiological mechanism potentially amenable to intervention.

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“…The neuropsychological assessment showed left spatial neglect (table 1), with perseveration behavior. 10 Personal neglect was mild, as assessed by tasks verbally requiring to reach, with the right hand, the left hand and other left-sided body parts, 11,12 and by a task requiring to search targets located on the body, 13 when blindfolded. P1, spontaneously and repeatedly, stated that her left hand belonged to her son, obdurately denying it was her own, while ownership of the remaining part of the left upper limb was preserved (table 2A).…”

Section: Participantsmentioning

confidence: 99%

Multisensory remission of somatoparaphrenic delusion

et al. 2014

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SummaryThis study investigates whether the rubber hand illusion (RHI) can induce a remission of somatoparaphrenia, a somatic delusion usually following righthemisphere damage, which typically manifests as a defective sense of ownership of one's contralesional body parts. First, we show that patients with somatoparaphrenia can experience a reliable RHI, exhibiting illusory effects similar to those reported by healthy participants. Moreover, synchronous touches applied to the patients' visible disowned left hand (rather than to the rubber hand), and to their right invisible unimpaired hand, induce an immediate self-attribution of the disowned hand, without affecting other sensorimotor or attentional disorders. The higher-level representation of the body concerned with ownership, deranged as a somatic delusion in patients with somatoparaphrenia, is penetrable, and can be restored by multisensory stimulations.

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The Fluff Test: A simple task to assess body representation neglect

Cited by 136 publications

References 23 publications

Spatial cognition: evidence from visual neglect

Spatial cognition: evidence from visual neglect

Anatomical Correlates of Directional Hypokinesia in Patients with Hemispatial Neglect

Multisensory remission of somatoparaphrenic delusion

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