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https://hdl.handle.net/2440/65789
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Type: | Journal article |
Title: | Memory strength effects in fMRI studies: A matter of confidence |
Author: | de Zubicaray, G. McMahon, K. Dunn, J. |
Citation: | Journal of Cognitive Neuroscience, 2011; 23(9):2324-2335 |
Publisher: | M I T Press |
Issue Date: | 2011 |
ISSN: | 0898-929X 1530-8898 |
Statement of Responsibility: | Greig I. de Zubicaray, Katie L. McMahon, Simon Dennis and John C. Dunn |
Abstract: | To investigate potentially dissociable recognition memory responses in the hippocampus and perirhinal cortex, fMRI studies have often used confidence ratings as an index of memory strength. Confidence ratings, although correlated with memory strength, also reflect sources of variability, including task-irrelevant item effects and differences both within and across individuals in terms of applying decision criteria to separate weak from strong memories. We presented words one, two, or four times at study in each of two different conditions, focused and divided attention, and then conducted separate fMRI analyses of correct old responses on the basis of subjective confidence ratings or estimates from single- versus dual-process recognition memory models. Overall, the effect of focussing attention on spaced repetitions at study manifested as enhanced recognition memory performance. Confidence- versus model-based analyses revealed disparate patterns of hippocampal and perirhinal cortex activity at both study and test and both within and across hemispheres. The failure to observe equivalent patterns of activity indicates that fMRI signals associated with subjective confidence ratings reflect additional sources of variability. The results are consistent with predictions of single-process models of recognition memory. |
Keywords: | Hippocampus Cerebral Cortex Humans Oxygen Magnetic Resonance Imaging Brain Mapping Analysis of Variance Photic Stimulation Mental Processes Memory Neuropsychological Tests Vocabulary Image Processing, Computer-Assisted Adolescent Adult Female Male Young Adult |
Rights: | © 2011 Massachusetts Institute of Technology |
DOI: | 10.1162/jocn.2010.21601 |
Grant ID: | http://purl.org/au-research/grants/arc/DP0878630 |
Published version: | http://dx.doi.org/10.1162/jocn.2010.21601 |
Appears in Collections: | Aurora harvest Psychology publications |
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