An FMRI analysis of the human hippocampus: inference, context, and task awareness.

An FMRI analysis of the human hippocampus: inference, context, and task awareness. Research Abstract Details 

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An FMRI analysis of the human hippocampus: inference, context, and task awareness. Abstract Text:

Anthony J Greene,William L Gross,Catherine L Elsinger,Stephen M Rao,

The hippocampus is critical for encoding and retrieving semantic and episodic memories. Animal studies indicate that the hippocampus is also required for relational learning tasks. A prototypical relational learning task, and the one investigated in this experiment, using event-related functional magnetic resonance imaging, is the transitive inference (TI) task. In the TI task, participants were to choose between A and B (A?B) and learned by trial and error to choose A (A > B). There were four such premise pairs during a training (A > B, B > C, C > D, D > E). These can be acquired distinctly or can be organized into a superordinate hierarchy (A > B > C > D > E), which would efficiently represent all the learned relations and allow inferences (e.g., B > D). At test there was no reinforcement: In addition to premise pairs, untrained pairings were introduced (e.g., A?E, B?D). Correctly inferring that B > D is taken as evidence for the formation of a superordinate hierarchy; several alternatives to the superordinate hierarchy hypothesis are considered. Awareness of the formation of this hierarchy was measured by a postscan questionnaire. Four main findings are reported: (1) Inferential performance and task awareness dissociated behaviorally and at the level of hemodynamic response; (2) As expected, performance on the inferred relation, B > D, corresponded to the ability to simultaneously acquire B > C and C > D premise pairs during training; (3) Interestingly, acquiring these "inner pairs" corresponded to greater hippocampal activation than the "outer pairs" (A > B, D > E) for all participants. However, a distinct pattern of hippocampal activity for these inner pairs differentiated those able to perform the inferential discrimination, B > D, at test. Because these inner premise pairs require contextual discrimination (e.g., C is incorrect in the context of B but correct in the context of D), we argue that the TI task is hippocampal-dependent because the premise pair acquisition necessary for inference is hippocampal-dependent; (4) We found B > D related hippocampal activity at test that is anatomically consistent with preconsolidation recall effects shown in other studies.

An FMRI analysis of the human hippocampus: inference, context, and task awareness. Publishing Authors By Initials

AJ Greene,WL Gross,CL Elsinger,SM Rao,

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An FMRI analysis of the human hippocampus: inference, context, and task awareness. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Journal of cognitive neuroscience

VOLUME: 18

Page Numbers: 1156-73

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ISSN: 0898-929X

DAY: 26

MONTH: Jul

YEAR: 2006

An FMRI analysis of the human hippocampus: inference, context, and task awareness. Information

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LANGUAGE: eng

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Grant and Affiliation Information for An FMRI analysis of the human hippocampus: inference, context, and task awareness.

AFFILIATION: Department of Psychology, University of Wisconsin, Milwaukee, WI 53211, USA. ag@uwm.edu

Country: United States

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MEDLINETA: J Cogn Neurosci

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