Age-related changes in feature-based object memory retrieval as measured by event-related potentials

作者：Chiang Hsueh Sheng; Mudar Raksha A; Spence Jeffrey S; Pudhiyidath Athula; Eroh Justin; De La Rosa Bambi; Kraut Michael A; Hart John Jr^*

来源：Biological Psychology, 2014, 100: 106-114.

DOI：10.1016/j.biopsycho.2014.05.010

• Semantic
• Object memory
• Memory retrieval
• Feature
• ERP
• Aging

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 750 ms 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 1000 ms 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.

• 出版日期2014-7