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Keywords:

  • parkinsonism;
  • bradyphrenia;
  • reaction time;
  • ageing process;
  • mental test score.

Reaction time was studied in 103 subjects with idiopathic parkinsonism and 144 without. Central processing time, as measured by the response to a warning, had a component which could be explained by the presence or absence of parkinsonism, but not by the ageing process, a mental test score, or consumption of exogenous substances. Depression did not influence the efficiency of response. Cigarette smoking and anti-parkinsonian medication were associated with greater efficiency.