title: Reaction times in Parkinson disease.
abstract: Ten hypokinetic parkinsonian patients and ten age- and sex-matched controls were tested, using reaction times with and without a warning signal. The time difference between each was used as a measure of phasic arousal. Both groups' reaction times improved with a warning signal, but there were no differences in reaction-time reduction between the parkinsonian and control groups. These results suggest either that hypokinesia in parkinsonism is not caused by an arousal defect or it is caused by a defect in the "autoevoked" arousal system.
mesh_terms: D001143:Arousal; D006801:Humans; D007980:Levodopa / Q000627:therapeutic use; D009043:Motor Activity; D010300:Parkinson Disease / Q000188:drug therapy / Q000503:physiopathology*; D011930:Reaction Time
chemical_list: D007980:Levodopa