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Cue dependent right hemineglect in schizophrenia: a kinematic analysis
M E Downing1, J G Phillips, J L Bradshaw
1Department of Psychology, Monash University, Clayton VIC, Australia.
Objectives:
Schizophrenia may result from disturbed attentional processes and/or defective internal cueing. Attention for subsequent action within a cued movement task was therefore studied, testing specific hypotheses of hemispheric dysfunction and of impaired interhemispheric communication.
Method:
Fifteen patients with schizophrenia and 15 matched controls were either cued or uncued when moving a pen to a target on their right or left side with their right or left hand. Pen tip position was sampled at 200 Hz on a WACOM SD420 graphics tablet for subsequent kinematic analysis.
Results:
Patients with schizophrenia were slower initiating rightwards movements without a cue. Patients also exhibited reduced abductive/adductive differences in the shape of their movement trajectories, implying differences in interhemispheric communication.
Conclusions:
It is speculated that schizophrenia is a form of cue dependent right hemineglect.
