Object individuation and compensation in healthy aging

Silvia Pagano, Elisa Fait, Debora Brignani, Veronica Mazza

Research output: Contribution to journalArticle

Abstract

Theories on neural compensation suggest that aged participants overactivate the brain areas involved in a task to compensate for the age-related decline. In this electrophysiological study, we investigated the temporal locus of neural overactivation in aging during multiple target processing. We measured performance and three event-related brain potential responses (N1, N2pc, and contralateral delay activity) in young and old adults, while they enumerated a variable number (1-4) of targets presented in an easy (distractor absent) or difficult (distractor present) condition. The main results indicated that although N2pc (~200 ms) increased in amplitude in the distractor-present condition in the young group, no modulation occurred for the old group. Old participants were associated with larger N2pc amplitudes than young participants in the distractor-absent condition, where both groups had comparable levels of accuracy. These effects were not present for N1 and contralateral delay activity. Overall, the data suggest that in enumeration, aging is associated with compensatory effects that rely on the selection mechanism responsible for target individuation.

Original languageEnglish
Pages (from-to)145-154
Number of pages10
JournalNeurobiology of Aging
Volume40
DOIs
Publication statusPublished - Apr 1 2016

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Keywords

  • Aging
  • ERPs
  • Multiple object processing
  • Neural compensation

ASJC Scopus subject areas

  • Clinical Neurology
  • Neuroscience(all)
  • Ageing
  • Developmental Biology
  • Geriatrics and Gerontology

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