title: Age-related changes in feature-based object memory retrieval as measured by event-related potentials.
abstract: To investigate neural mechanisms that support semantic functions in aging, we recorded scalp EEG during an object retrieval task in 22 younger and 22 older adults. The task required determining if a particular object could be retrieved when two visual words representing object features were presented. Both age groups had comparable accuracy although response times were longer in older adults. In both groups a left fronto-temporal negative potential occurred at around 750ms during object retrieval, consistent with previous findings (Brier, Maguire, Tillman, Hart, & Kraut, 2008). In only older adults, a later positive frontal potential was found peaking between 800 and 1000ms during no retrieval. These findings suggest younger and older adults employ comparable neural mechanisms when features clearly facilitate retrieval of an object memory, but when features yield no retrieval, older adults use additional neural resources to engage in a more effortful and exhaustive search prior to making a decision.
authors.affiliation: Center for BrainHealth, The University of Texas at Dallas, 2200 West Mockingbird Lane, Dallas, TX 75235, USA.
authors.forename: Hsueh-Sheng
authors.initials: HS
authors.lastname: Chiang
authors.affiliation: Center for BrainHealth, The University of Texas at Dallas, 2200 West Mockingbird Lane, Dallas, TX 75235, USA; Department of Speech and Hearing Science, University of Illinois at Urbana-Champaign, 901 South Sixth Street, Champaign, IL 61820, USA.
authors.forename: Raksha A
authors.initials: RA
authors.lastname: Mudar
authors.affiliation: Center for BrainHealth, The University of Texas at Dallas, 2200 West Mockingbird Lane, Dallas, TX 75235, USA.
authors.forename: Jeffrey S
authors.initials: JS
authors.lastname: Spence
authors.affiliation: Center for BrainHealth, The University of Texas at Dallas, 2200 West Mockingbird Lane, Dallas, TX 75235, USA.
authors.forename: Athula
authors.initials: A
authors.lastname: Pudhiyidath
authors.affiliation: Center for BrainHealth, The University of Texas at Dallas, 2200 West Mockingbird Lane, Dallas, TX 75235, USA.
authors.forename: Justin
authors.initials: J
authors.lastname: Eroh
authors.affiliation: Center for BrainHealth, The University of Texas at Dallas, 2200 West Mockingbird Lane, Dallas, TX 75235, USA.
authors.forename: Bambi
authors.initials: B
authors.lastname: DeLaRosa
authors.affiliation: Center for BrainHealth, The University of Texas at Dallas, 2200 West Mockingbird Lane, Dallas, TX 75235, USA; Department of Radiology, The Johns Hopkins University School of Medicine, 601 North Caroline Street, Baltimore, MD 21287, USA.
authors.forename: Michael A
authors.initials: MA
authors.lastname: Kraut
authors.affiliation: Center for BrainHealth, The University of Texas at Dallas, 2200 West Mockingbird Lane, Dallas, TX 75235, USA; Department of Neurology and Neurotherapeutics, The University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX 75390, USA. Electronic address: jhart@utdallas.edu.
authors.forename: John
authors.initials: J
authors.lastname: Hart
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000375:Aging; D001245:Association Learning / Q000502:physiology*; D001931:Brain Mapping; D004569:Electroencephalography; D005071:Evoked Potentials / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D011939:Mental Recall / Q000502:physiology*; D008875:Middle Aged; D010364:Pattern Recognition, Visual / Q000502:physiology*; D010775:Photic Stimulation; D025341:Principal Component Analysis; D014825:Vocabulary; D055815:Young Adult
keywords: Aging; ERP; Feature; Memory retrieval; Object memory; Semantic