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Visual target processing in high- and low-performing older subjects indexed by P3 component.

L Lorenzo-López1, E Amenedo, P Pazo-Alvarez

  • 1Department of Clinical Psychology and Psychobiology, Faculty of Psychology, University of Santiago de Compostela, Galicia, Spain. laurall@usc.es <laurall@usc.es>

Neurophysiologie Clinique = Clinical Neurophysiology
|June 2, 2007
PubMed
Summary

Older adults who perform poorly on visual attention tasks show a decline in brain resources for processing stimuli. This decline is linked to reduced P3 event-related potential (ERP) amplitude and increased variability.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Gerontology

Background:

  • The P3 event-related potential (ERP) component is a marker of cognitive processing, particularly in attention and working memory.
  • Aging can affect cognitive functions, including visual attention, with varying performance levels observed in older adults.

Purpose of the Study:

  • To investigate age-related changes in P3 ERP parameters in relation to performance on a visual attention task.
  • To differentiate cognitive processing between high- and low-performing older adults compared to young adults.

Main Methods:

  • Conventional and single-trial analyses of the visual P3 component were conducted.
  • Participants were divided into young and older healthy groups, further categorized as high- or low-performers based on a visual attention task.

Main Results:

  • P3 latency increased significantly with age.
  • Low-performing older adults exhibited reduced P3 amplitude at posterior sites and more widespread brain activity compared to high-performing older and young subjects.
  • Single-trial analysis revealed higher P3 latency variability and fewer trials with P3 generation in low-performing older adults.

Conclusions:

  • Data suggest a specific decline in visual target processing in low-performing older adults, indicating reduced attentional brain resources for stimulus selection.
  • Findings contribute to the debate on compensation versus dedifferentiation in normal aging processes.