title: Functional Brain Activation Associated with Inhibitory Control Deficits in Older Adults.
abstract: In young adults, canceling an initiated action depends on the right inferior frontal cortex (IFC), presupplementary motor area (preSMA), and the basal ganglia. Older adults show response inhibition deficits, but how this relates to functional brain activation remains unclear. Using event-related functional magnetic resonance imaging, we tested whether older adults (N = 20) exhibit overactivation during stop-signal inhibition as shown for attentional control tasks, or reduced activity compared with young adults (N = 20). We used a modified stop-signal task involving coupled bimanual responses and manipulated whether both or just one hand was cued to stop. Stop-task difficulty was matched across groups. We found a group by condition interaction in supramarginal gyrus, anterior insula, rIFC, and preSMA, with activation increasing for successful Stop versus Go trials in the young adults only. Comparing the groups on Stop trials revealed preSMA and striatum hypoactivity for older adults. White matter tracts connecting rIFC, preSMA, and the subthalamic nuclei were associated with stronger activation of preSMA in older adults, suggesting that maintenance of the brain's structure has positive implications for brain function.
authors.affiliation: Movement Neuroscience Laboratory, Department of Sport and Exercise Science Centre for Brain Research, University of Auckland, Auckland, New Zealand Movement Control and Neuroplasticity Research Group, KU Leuven, Leuven, Belgium.
authors.forename: James P
authors.initials: JP
authors.lastname: Coxon
authors.affiliation: School of Exercise and Nutritional Sciences, San Diego State University, San Diego, CA, USA.
authors.forename: Daniel J
authors.initials: DJ
authors.lastname: Goble
authors.affiliation: Movement Control and Neuroplasticity Research Group, KU Leuven, Leuven, Belgium.
authors.forename: Inge
authors.initials: I
authors.lastname: Leunissen
authors.affiliation: Movement Control and Neuroplasticity Research Group, KU Leuven, Leuven, Belgium.
authors.forename: Annouchka
authors.initials: A
authors.lastname: Van Impe
authors.affiliation: Movement Control and Neuroplasticity Research Group, KU Leuven, Leuven, Belgium Neural Control of Movement Laboratory, Department of Health Sciences and Technology, ETH, Zurich, Switzerland.
authors.forename: Nicole
authors.initials: N
authors.lastname: Wenderoth
authors.affiliation: Movement Control and Neuroplasticity Research Group, KU Leuven, Leuven, Belgium Leuven Research Institute for Neuroscience & Disease (LIND), KU Leuven, Leuven, Belgium.
authors.forename: Stephan P
authors.initials: SP
authors.lastname: Swinnen
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000375:Aging / Q000502:physiology*; D001921:Brain / Q000502:physiology*; D001931:Brain Mapping; D005260:Female; D007839:Functional Laterality / Q000502:physiology*; D006801:Humans; D007266:Inhibition, Psychological; D008279:Magnetic Resonance Imaging / Q000379:methods; D008297:Male; D008875:Middle Aged; D009434:Neural Pathways / Q000502:physiology*; D009483:Neuropsychological Tests; D011597:Psychomotor Performance / Q000502:physiology*; D011930:Reaction Time
keywords: aging; cognitive control; fMRI; response inhibition; stop signal