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[P300 and dementia: diagnostic relevance. I]
U Wranek1, G Ladurner, W Klimesch
1Institut für Psychologie, Universität und Abteilung für Neurologie der Landesnervenklinik, Salzburg.
EEG-EMG Zeitschrift Fur Elektroenzephalographie, Elektromyographie Und Verwandte Gebiete
|September 1, 1990
Summary
Patients with multi-infarct dementia and brain infarcts showed prolonged P300 latency and reaction time. These cognitive markers correlated with the WAIS-index but were insufficient for individual diagnosis of dementia.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Neurology
Background:
- Multi-infarct dementia (MID) and other brain infarct diseases can impact cognitive function.
- Visual evoked potentials (VEPs), particularly the P300 response, and reaction time (RT) are sensitive electrophysiological and behavioral measures of cognitive processing.
- Assessing these markers may help differentiate between demented and non-demented individuals with cerebrovascular disease.
Purpose of the Study:
- To investigate differences in P300 latency and reaction time between patients with multi-infarct dementia, non-demented brain infarct patients, and healthy controls.
- To examine the correlation between these electrophysiological and behavioral measures and cognitive status assessed by the WAIS-index.
Main Methods:
- Recorded visual evoked potentials (VEPs), including P300 response, and reaction time in three groups: 20 MID patients, 20 non-demented brain infarct patients, and 20 age-matched controls.
- Administered the Wechsler Adult Intelligence Scale (WAIS-index) to assess cognitive function in patient groups.
Main Results:
- Both patient groups exhibited significantly prolonged P300 latency and reaction time compared to controls.
- A significant correlation was found between prolonged P300 latency, extended reaction time, and lower WAIS-index scores in both patient groups.
- Despite significant group differences, the observed effects on P300 latency and reaction time were not robust enough for reliable individual classification of dementia.
Conclusions:
- Prolonged P300 latency and reaction time are indicative of cognitive impairment in patients with multi-infarct dementia and other brain infarct diseases.
- These electrophysiological and behavioral measures show promise as objective indicators of cognitive decline associated with cerebrovascular disease.
- Further research is needed to enhance the diagnostic utility of VEPs and reaction time for individual dementia classification.