Covert orienting attention in Parkinson's disease.

@article{Yamada1990CovertOA,
  title={Covert orienting attention in Parkinson's disease.},
  author={Tetsuya Yamada and M Izyuuinn and Michael Schulzer and Keizo Hirayama},
  journal={Journal of neurology, neurosurgery, and psychiatry},
  year={1990},
  volume={53 7},
  pages={593-6}
}
We examined covert orienting attention in twenty patients with Parkinson's disease using Posner's reaction time (RT) method. Patients were divided according to the grade of severity (Hoehn and Yahr), the P1 group was grade I-II and P2 group grade II-IV. Each group of patients was compared with an equal number of age-matched controls. In controls, and in the less disabled younger P1 group, a significant RT difference was shown between "valid" and "crossed" conditions, that is, when the cue and… CONTINUE READING
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Frontal lobe lesions slow the movement of visual attention

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Possible involvement of attention processes in Parkinson ' s disease

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