When I am (almost) 64: The effect of normal ageing on implicit motor imagery in young elderlies

Laura Zapparoli, Gianluca Saetta, Carlo De Santis, Martina Gandola, Alberto Zerbi, Giuseppe Banfi, Eraldo Paulesu

Research output: Contribution to journalArticle

Abstract

Motor imagery (M.I.) is a cognitive process in which movements are mentally evoked without overt actions. Behavioral and fMRI studies show a decline of explicit M.I. ability (e.g., the mental rehearsal of finger oppositions) with normal ageing: this decline is accompanied by the recruitment of additional cortical networks.However, none of these studies investigated behavioral and the related fMRI ageing modifications in implicit M.I. tasks, like the hand laterality task (HLT).To address this issue, we performed a behavioral and fMRI study: 27 younger subjects (mean age: 31 years) and 29 older subjects (mean age: 61 years) underwent two event-related design fMRI experiments. In the HLT, participants were asked to decide whether a hand rotated at different angles was a left or right hand. To test the specificity of any age related difference in the HLT, we used a letter rotation task as a control experiment: here subjects had to decide whether rotated letters were presented in a standard or a mirror orientation.We did not find any group difference in either behavioral task; however, we found significant additional neural activation in the elderly group in occipito-temporal regions: these differences were stronger for the HLT rather than for the LRT with group by task interactions effects in right occipital cortices.We interpret these results as evidence of compensatory processes associated with ageing that permit a behavioral performance comparable to that of younger subjects. This process appears to be more marked when the task specifically involves motor representations, even when these are implicitly evoked.

Original languageEnglish
Pages (from-to)137-151
Number of pages15
JournalBehavioural Brain Research
Volume303
DOIs
Publication statusPublished - Apr 15 2016

Keywords

  • Ageing
  • FMRI
  • Hand laterality task
  • Implicit motor imagery

ASJC Scopus subject areas

  • Behavioral Neuroscience

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