Recognition of Random Shapes by Patients with Unilateral Lesions as a Function of Complexity, Association Value and Delay

Bisiach, Edoardo; Faglioni, P.

doi:10.1016/s0010-9452(74)80001-8

Cited by 71 publications

(34 citation statements)

References 11 publications

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“…Contralesional motor, somatosensory, and visual field deficits, including extinction to tactile and visual stimuli, were assessed by a standard neurological examination; for each function tested (i.e., visual, somatosensory, and motor), the score range was: 3 = maximum deficit; 0 = unimpaired performance (Bisiach and Faglioni, 1974). Anosognosia for neurological deficits was assessed by the standard interview of Bisiach et al (1986b), which provides scores ranging from 0 (no anosognosia) to 3 (maximum deficit).…”

Section: Methodsmentioning

confidence: 99%

Bisecting Real and Fake Body Parts: Effects of Prism Adaptation After Right Brain Damage

Bolognini

Casanova

Maravita

et al. 2012

Front. Hum. Neurosci.

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The representation of body parts holds a special status in the brain, due to their prototypical shape and the contribution of multisensory (visual and somatosensory-proprioceptive) information. In a previous study (Sposito et al., 2010), we showed that patients with left unilateral spatial neglect exhibit a rightward bias in setting the midpoint of their left forearm, which becomes larger when bisecting a cylindrical object comparable in size. This body part advantage, found also in control participants, suggests partly different processes for computing the extent of body parts and objects. In this study we tested 16 right-brain-damaged patients, and 10 unimpaired participants, on a manual bisection task of their own (real) left forearm, or a size-matched fake forearm. We then explored the effects of adaptation to rightward displacing prism exposure, which brings about leftward aftereffects. We found that all participants showed prism adaptation (PA) and aftereffects, with right-brain-damaged patients exhibiting a reduction of the rightward bias for both real and fake forearm, with no overall differences between them. Second, correlation analyses highlighted the role of visual and proprioceptive information for the metrics of body parts. Third, single-patient analyses showed dissociations between real and fake forearm bisections, and the effects of PA, as well as a more frequent impairment with fake body parts. In sum, the rightward bias shown by right-brain-damaged patients in bisecting body parts is reduced by prism exposure, as other components of the neglect syndrome; discrete spatial representations for real and fake body parts, for which visual and proprioceptive codes play different roles, are likely to exist. Multisensory information seems to render self bodily segments more resistant to the disruption brought about by right-hemisphere injury.

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Section: Methodsmentioning

confidence: 99%

Bisecting Real and Fake Body Parts: Effects of Prism Adaptation After Right Brain Damage

Bolognini

Casanova

Maravita

et al. 2012

Front. Hum. Neurosci.

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“…All patients had a normal or corrected-to-normal vision. Contralesional motor, somatosensory, and visual half-field deficits, including extinction to tactile and visual double simultaneous stimuli, were assessed by a standard neurological exam (Bisiach and Faglioni, 1974). Visual field defects were also assessed by kinetic Goldmann perimetry, and by a computerized program testing six different positions in both the left and right hemi-fields, at different eccentricities (3°, 6°, 12°).…”

Section: Methodsmentioning

confidence: 99%

Visuo-Haptic Interactions in Unilateral Spatial Neglect: The Cross Modal Judd Illusion

et al. 2011

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Unilateral spatial neglect (USN) has been mainly investigated in the visual modality; only few studies compared spatial neglect across different sensory modalities, and explored their multisensory interactions, with controversial results. We investigated the integration between vision and haptics, through a bisection task of a cross modal illusion, the Judd variant of the Müller-Lyer illusion. We examined right-brain-damaged patients with (n = 7) and without (n = 7) left USN, and neurologically unimpaired participants (n = 14) in the bisection of Judd stimuli under visual, haptic, and visuo-haptic presentation. Neglect patients showed the characteristic rightward bias in the bisection of the baseline stimuli in the visual modality, but not in the haptic and visuo-haptic conditions. The illusory effects were preserved in each group and in each modality, indicating that the processing of the cross modal illusion is independent of the presence of deficits of spatial attention and representation. Spatial neglect can be modality-specific, but visual and tactile sensory inputs are properly integrated.

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“…Visual field examination disclosed a right upper quadrantanopia (tested by Kinetic Goldmann perimethry). Standardized neurological examination (Bisiach and Faglioni, 1974;Bisiach and Vallar, 2000) did not provide evidence of extinction of visual and tactile stimuli. Constructional abilities were spared.…”

Section: Case History and General Neuropsychological Examinationmentioning

confidence: 98%

A stimulus-centered reading disorder for words and numbers: Is it neglect dyslexia?

Arduino¹,

Daini²,

Silveri³

2005

Neurocase

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A single case, RCG, showing a unilateral reading disorder without unilateral spatial neglect was studied. The disorder was characterized by substitutions of the initial (left) letters of words, nonwords and Arabic numbers, independently of egocentered spatial coordinates. MRI showed a bilateral lesion with the involvement of the splenium. Although, within the framework of the visual word recognition model proposed by Caramazza and Hillis (1990), RCG disorder could be defined as a stimulus-centered neglect dyslexia, we discuss the hypothesis of a dissociation in neural correlates and mechanisms between the syndrome of unilateral spatial neglect and such a unilateral reading disorder.

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Recognition of Random Shapes by Patients with Unilateral Lesions as a Function of Complexity, Association Value and Delay

Cited by 71 publications

References 11 publications

Bisecting Real and Fake Body Parts: Effects of Prism Adaptation After Right Brain Damage

Bisecting Real and Fake Body Parts: Effects of Prism Adaptation After Right Brain Damage

Visuo-Haptic Interactions in Unilateral Spatial Neglect: The Cross Modal Judd Illusion

A stimulus-centered reading disorder for words and numbers: Is it neglect dyslexia?

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