Journal ArticleDOI
Perceptual and premotor factors of unilateral neglect
TLDR
Right-brain-damaged patients showing unilateral neglect underwent a specifically devised line-bisection task that allowed uncoupling of the direction of visual attention from that of hand movement, which made it possible to isolate and separately assess perceptual and premotor factors of the disorder.Abstract:
Right-brain-damaged patients showing unilateral neglect underwent a specifically devised line-bisection task that allowed uncoupling of the direction of visual attention from that of hand movement. This made it possible to isolate and separately assess perceptual and premotor factors of the disorder. Comparison of experimental and radiologic data suggested that premotor factors were more pronounced in patients with lesions involving the frontal lobes than in patients with lesions confined to postrolandic areas. The technique employed is compatible with bedside examination and provides data useful for standard assessment of neglect symptomatology for both clinical and experimental purposes.read more
Citations
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Journal ArticleDOI
Pseudoneglect: a review and meta-analysis of performance factors in line bisection tasks.
George Jewell,Mark E. McCourt +1 more
TL;DR: An exhaustive qualitative (vote-counting) review is conducted of the literature concerning visual and non-visual line bisection in neurologically normal subject populations, which indicates a significant leftward bisection error in Neurologically normal subjects.
Journal ArticleDOI
Spatial attention and neglect: parietal, frontal and cingulate contributions to the mental representation and attentional targeting of salient extrapersonal events.
TL;DR: The syndrome of contralesional neglect reflects a lateralized disruption of spatial attention, and patients with left neglect experience a loss of salience in the mental representation and conscious perception of the left side and display a reluctance to direct orientating and exploratory behaviours to the left.
Journal ArticleDOI
Improved discrimination of AD patients using beta-amyloid((1-42)) and tau levels in CSF
Frank Hulstaert,Kaj Blennow,Adrian Ivanoiu,HC Schoonderwaldt,Matthias Riemenschneider,P.P. De Deyn,C. Bancher,Patrick Cras,Jens Wiltfang,Pankaj Mehta,Khalid Iqbal,Hans Pottel,Eugeen Vanmechelen,Hugo Vanderstichele +13 more
TL;DR: The combined measure of CSF Aβ42 and tau meets the requirements for clinical use in discriminating AD from normal aging and specific neurologic disorders.
Journal ArticleDOI
Perceptual awareness and its loss in unilateral neglect and extinction
John Driver,Patrik Vuilleumier +1 more
TL;DR: Patient findings are related to neurophysiological data from areas in the monkey parietal lobe which indicate that these serve as cross-modal and sensorimotor interfaces highlighting currently relevant locations as targets for intentional action, and speculate on the special role such brain regions may play in perceptual awareness.
Journal ArticleDOI
Hemispatial neglect Subtypes, neuroanatomy, and disability
Lj Buxbaum,Mk Ferraro,Tracy Veramonti,Alessandro Farnè,John Whyte,Elisabetta Làdavas,Francesca Frassinetti,H. Coslett +7 more
TL;DR: The neglect syndrome per se, rather than overall stroke severity, predicts poor outcome in right hemisphere stroke.
References
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Journal ArticleDOI
Deficits in attention and movement following the removal of postarcuate (area 6) and prearcuate (area 8) cortex in macaque monkeys.
TL;DR: The effect of unilateral surgical ablations of the postarcuate cortex (area 6) has been studied in the macaque monkey and two series of neurological deficits were found: a failure to grasp food with the mouth when presented contralaterally to the lesion and a reluctance to use the contralateral hand.
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Unilateral neglect, representational schema and consciousness
TL;DR: Right brain-damaged patients with unilateral neglect were asked to detect differences within pairs of patterns moving left- or rightward behind a narrow vertical slit; it was seen that differences occurring on the left side of the mentally reconstructed images were less easily detected.
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Unilateral neglect: Personal and extra-personal
TL;DR: The results suggest a non-unitary frame of spatial reference for unilateral neglect, which may be interpreted in terms of a personal vs extra-personal dichotomy.
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Directional hypokinesia Prolonged reaction times for leftward movements in patients with right hemisphere lesions and neglect
TL;DR: It is postulate that hemispatial neglect induced by right hemisphere lesions may be associated with a directional hypokinesia: initiation of movements toward the hemispace contralateral to the lesion is affected more than movements towardThe lesion.
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Hemispace-visual field interactions in visual extinction.
TL;DR: In this article, the authors found that visual extinction occurred during double simultaneous stimulation within the same visual hemi-field (VHF) and that interhemispheric rivalry was not a critical factor.