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An Experimental Paradigm for Measuring the Effects of Ageing on Sentence Processing
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Published on: October 25, 2019

Electrophysiological evidence for aging effects on local contextual processing.

Noa Fogelson1, Mona Shah, Frederique Bonnet-Brilhault

  • 1Department of Psychology and the Helen Wills Neuroscience Institute, University of California Berkeley, CA, USA. nfogelson@udc.es

Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
|June 30, 2009
PubMed
Summary
This summary is machine-generated.

Aging alters how the brain processes visual context. Older adults show prolonged brain responses to predictive cues, suggesting changes in local contextual processing with age.

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Area of Science:

  • Cognitive Neuroscience
  • Human Aging Research

Background:

  • Local contextual processing is crucial for efficient target detection.
  • Aging may impact the neural mechanisms underlying contextual processing.

Purpose of the Study:

  • To investigate the effects of aging on local contextual processing using event-related potentials (ERPs).
  • To compare neural responses to predictive versus random visual stimuli in young and older adults.

Main Methods:

  • Event-related potentials (ERPs) were recorded while participants performed a visual target detection task.
  • Stimuli included targets and standard visual shapes presented in either random or predictive sequences.
  • Behavioral responses (button presses) and electrophysiological data were analyzed.

Main Results:

  • Predictive local context reduced stimulus evaluation time in both age groups, indicated by a P3b latency shift.
  • An earlier latency context positivity was prolonged in older adults compared to young adults.
  • Older adults exhibited a late sustained positivity in the predictive condition, absent in younger adults.

Conclusions:

  • Local contextual effects on target detection are altered in older adults.
  • Aging impacts the temporal dynamics and neural signatures of predictive processing.