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Laterally directed arm movements and right unilateral neglect after left hemisphere damage
- Source :
- Neuropsychologia. 39(10)
- Publication Year :
- 2001
-
Abstract
- Signs of unilateral neglect for events occurring in one hemispace most often result from right hemisphere lesions. Right unilateral neglect after left hemisphere damage is much rarer, and has received less attention. The present study explores the relationships between right unilateral neglect and asymmetries in producing laterally directed arm movements in the horizontal plane in left brain-damaged (LBD) patients. Participants produced right- or left-directed arm movements with their left arm in response to centrally located visual stimuli. Results showed that LBD patients with signs of right unilateral neglect were consistently slowed when producing arm movements toward the right (neglected) side, as compared to left-directed movements. Taking into account patients with and without signs of neglect, this directional asymmetry positively correlated with a reaction-time measure of perceptual spatial bias. These findings stand in contrast with previous results obtained with the same experimental paradigm in right brain-damaged patients, in whom a consistent slowing of leftward-directed movements was rare and apparently unrelated to the presence and severity of left neglect. These conflicting results are discussed with respect to the hypothesis that different mechanisms may underlie left and right unilateral neglect.
- Subjects :
- Left and right
Adult
Male
medicine.medical_specialty
Visual perception
Cognitive Neuroscience
media_common.quotation_subject
Experimental and Cognitive Psychology
Neuropsychological Tests
Lateralization of brain function
Neglect
Perceptual Disorders
Behavioral Neuroscience
Physical medicine and rehabilitation
Orientation
medicine
Humans
Right hemisphere
Dominance, Cerebral
media_common
Aged
Cerebral Hemorrhage
Aged, 80 and over
Cerebral Cortex
Brain Mapping
Body movement
Cerebral Infarction
Middle Aged
medicine.anatomical_structure
Unilateral neglect
Upper limb
Hemianopsia
Female
Psychology
Neuroscience
Psychomotor Performance
Subjects
Details
- ISSN :
- 00283932
- Volume :
- 39
- Issue :
- 10
- Database :
- OpenAIRE
- Journal :
- Neuropsychologia
- Accession number :
- edsair.doi.dedup.....f5724534d2ca663316d2b1522623abb9