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Delayed visual P3 in unilateral thalamic stroke.

E Trinka·J Unterrainer·W Staffen·N W Löscher·G Ladurner
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Abstract

The P3 potential is accepted as a neurophysiological correlate of memory and attention. Delayed latencies were reported in different forms of dementias. Although the generator sites are still under debate, the thalamus may play a crucial role. The aim of this study was to investigate the influence of an unilateral thalamic ischaemic infarction on P3 generation. The event-related P3 component of six patients (2 male, four female; mean age 47 years, range 22-63 years) with unilateral thalamic ischaemic infarction was studied and compared to age-matched controls (five male, nine female; mean age 45.8 years; range 22-69 years). All patients underwent full clinical examination, CCT, and MRI scan. P3 potentials were recorded with a visual three stimulus discrimination paradigm. The mean P3 latency of the patient group to the target stimulus was delayed (469.7 ms, SD = 36.8) compared with the controls (378.8 ms, SD = 51.5; P < 0. 05). The mean P3 latency to the unexpected stimulus was delayed in patients with thalamic infarction compared with controls [477 ms (SD = 46.6) vs. 381.2 ms (SD = 48.5); P < 0.001). Delayed P3 components of the event-related potential (ERP) were recorded in six patients with unilateral thalamic infarction, suggesting an important role of the thalamus in the generation of the P3 potential.

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AdultAgedAttentionElectroencephalographyEvent-Related Potentials, P300Evoked Potentials, VisualFemaleFunctional LateralityHumansInfarction, Posterior Cerebral ArteryMaleMiddle AgedReaction TimeThalamusJournal Article

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BibTeXRIS

E Trinka, J Unterrainer, W Staffen, N W Löscher, G Ladurner. 2000. Delayed visual P3 in unilateral thalamic stroke.. https://doi.org/10.1046/j.1468-1331.2000.t01-1-00117.x

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