Position of the egocentric reference and directional arm movements in right-brain-damaged patients.
We asked 12 right-brain-damaged patients (6 with left neglect signs and 6 without left neglect signs) to perform a straight ahead pointing task and a visual detection task with lateralized motor response, in order to investigate the relationship between the position of the egocentric reference and response time and accuracy in producing lateralized arm movements. Results showed that there was no correlation between the position of the egocentric reference and neglect signs, nor between the position of the egocentric reference and the latencies to direct a motor response toward either side of space. These findings were interpreted within the context of egocentric hypotheses of neglect. In particular, it was suggested that attentional or intentional neglect signs cannot be considered as a direct consequence of an ipsilesional deviation of the egocentric reference.
Chokron
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Laboratoire de Psychologie Expérimentale, Université de Savoie, Chambéry, CNRS ep 617, France. chokron@ext.jussieu.fr
Bartolomeo
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P
D000328:Adult; D000368:Aged; D001132:Arm / Q000503:physiopathology*; D002545:Brain Ischemia / Q000150:complications*; D002543:Cerebral Hemorrhage / Q000150:complications*; D007839:Functional Laterality; D006801:Humans; D008297:Male; D008875:Middle Aged; D009069:Movement Disorders / Q000209:etiology* / Q000503:physiopathology*; D010468:Perceptual Disorders / Q000209:etiology; D011930:Reaction Time; D013028:Space Perception / Q000502:physiology; D013037:Spatial Behavior / Q000502:physiology; D011795:Surveys and Questionnaires; D014794:Visual Fields / Q000502:physiology