Time resolution for visual information processing in Parkinson’s disease
- aDepartment of Physiology, bDepartment of Physical Medicine and Rehabilitation, Faculty of Medicine, cDepartment of Statistics, Operating Research and Computation, dDepartment of Psychobiology, University of La Laguna, Tenerife, Spain
- Dr Manuel Rodríguez Díaz, Department of Physiology, Faculty of Medicine, University of La Laguna, 38320, Tenerife, Spain. Fax 00349 22 319397.
- Received 12 March 1997
- Revised 11 June 1998
- Accepted 15 June 1998
Abstract
It has been suggested that a deficit in timing could be the cause of the sensory disturbances reported for Parkinson’s disease. To test this hypothesis the temporal discrimination thresholds in four visual tasks were used to study 45 healthy young people, 14 healthy elderly people, and 17 patients with Parkinson’s disease. In these tasks, subjects watched a computer controlled light emitting diode display and pushed a button when the visual event previously specified by the researcher was perceived. The time between successive images required to discriminate a visual detail was accurately quantified. In two of the four tasks, the time for visual processing of image sequences was longer in the elderly group than in the young group. No significant differences were found between patients with Parkinson’s disease and their age matched controls for any of the four tasks. Present data show normal temporal discrimination and no slowing in the initial steps of visual processing in Parkinson’s disease.
