Two-dimensional distortion of space representation in unilateral neglect: perceptual and response-related factors.
The paper reports the results of an experiment in which left-neglect patients were required to point at the location they judged vertically to correspond (within the frame of the visual stimulus display they were given) with a cue that was variably located along a left-right axis lying proximally or distally with respect to the left-right axis over which they had to give their response. Patients were found to make rightward errors as in a similar, single-case study. The significant positive correlation between those errors and the degree of response bias on a manual-response version of the Milner Landmark Task suggests that rightward pointing errors made by left-neglect patients in conditions such as those set in the present experiment are due to a dysfunction selectively affecting an output-related component of space representation.
Bisiach
E
E
Dipartimento di Psicologia, Università di Torino, Italy.
Ricci
R
R
Berruti
G
G
Genero
R
R
Pepi
R
R
Fumelli
T
T
D000368:Aged; D000369:Aged, 80 and over; D002540:Cerebral Cortex / Q000503:physiopathology; D004292:Dominance, Cerebral / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009483:Neuropsychological Tests; D009949:Orientation / Q000502:physiology*; D010468:Perceptual Disorders / Q000175:diagnosis / Q000503:physiopathology*; D010469:Perceptual Distortion / Q000502:physiology*; D011597:Psychomotor Performance / Q000502:physiology*; D012016:Reference Values; D020521:Stroke / Q000175:diagnosis / Q000503:physiopathology