Memory strength effects in fMRI studies: a matter of confidence

de Zubicaray, Greig I., McMahon, Katie L., Dennis, Simon and Dunn, John C. (2011) Memory strength effects in fMRI studies: a matter of confidence. Journal of Cognitive Neuroscience, 23 9: 2304-2315. doi:10.1162/jocn.2010.21601

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Author de Zubicaray, Greig I.
McMahon, Katie L.
Dennis, Simon
Dunn, John C.
Title Memory strength effects in fMRI studies: a matter of confidence
Journal name Journal of Cognitive Neuroscience   Check publisher's open access policy
ISSN 0898-929X
Publication date 2011-09
Year available 2010
Sub-type Article (original research)
DOI 10.1162/jocn.2010.21601
Open Access Status File (Publisher version)
Volume 23
Issue 9
Start page 2304
End page 2315
Total pages 12
Editor Mark D'Esposito
Place of publication Cambridge, MA, United States
Publisher M I T Press
Collection year 2011
Language eng
Formatted 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, focussed 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.
© Massachusetts Institute of Technology
Keyword Medial temporal-lobe
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Corrected Proof posted online December 2, 2010.

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2011 Collection
School of Psychology Publications
Centre for Advanced Imaging Publications
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Citation counts: TR Web of Science Citation Count  Cited 3 times in Thomson Reuters Web of Science Article | Citations
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Created: Wed, 09 Mar 2011, 14:19:21 EST by Sandrine Ducrot on behalf of School of Psychology