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Reber PJ, Gitelman DR, Parrish TB, Mesulam MM.

Dissociating Explicit and Implicit Category Knowledge with fMRI

fMRIDC Accession Number: 2-2002-113D1
Journal of Cognitive Neuroscience 2003 May ;15(4): p.574-583
View entire article (off-site link)
PubMed ID: 12803968 (off-site link)

Study Meta-Data

NIH grant number 5R01MH058748-02 (off-site link)

Neuroimaging of healthy volunteers identified separate neural systems supporting the expression of category knowledge depending on whether the learning mode was intentional or incidental. The same visual category was learned either intentionally or implicitly by two separate groups of participants. During a categorization test, functional magnetic resonance imaging (fMRI) was used to compare brain activity evoked by category members and nonmembers. After implicit learning, when participants had learned the category incidentally, decreased occipital activity was observed for novel categorical stimuli compared with noncategorical stimuli. In contrast, after intentional learning, novel categorical stimuli evoked increased activity in the hippocampus, right prefrontal cortex, left inferior temporal cortex, precuneus, and posterior cingulate. Even though the categorization test was identical in the two conditions, the differences in brain activity indicate differing representations of category knowledge depending on whether the category had been learned intentionally or implicitly.

Supplemental Information

Language: English
Country: USA
Has anatomical data
Has raw image data

Comments on Dissociating Explicit and Implicit Category Knowledge with fMRI by interch on March 22, 2006 @14:19

[ Reply ]

Reanalysis attempt by Petr on March 22, 2006 @14:31	[ Reply ]
This dataset was selected by a group of students engaged in analyses of the fMRIDC's dataset library using SPM5 and FSL tools, as part of an fMRI data analysis course at UC Davis. The 2-2002-113D1 analysis log contains information that could be useful to others trying to utilize this dataset.

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