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.2011 Jan 1;54(1):653-60.
doi: 10.1016/j.neuroimage.2010.07.046. Epub 2010 Jul 23.

Remembering beauty: roles of orbitofrontal and hippocampal regions in successful memory encoding of attractive faces

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Remembering beauty: roles of orbitofrontal and hippocampal regions in successful memory encoding of attractive faces

Takashi Tsukiura et al. Neuroimage..

Abstract

Behavioral data have shown that attractive faces are better remembered but the neural mechanisms of this effect are largely unknown. To investigate this issue, female participants were scanned with event-related functional MRI (fMRI) while rating the attractiveness of male faces. Memory for the faces was tested after fMRI scanning and was used to identify successful encoding activity (subsequent memory paradigm). As expected, attractive faces were remembered better than other faces. The study yielded three main fMRI findings. First, activity in the right orbitofrontal cortex increased linearly as a function of attractiveness ratings. Second, activity in the left hippocampus increased as a function of subsequent memory (subsequent misses<low confidence hits<high confidence hits). Third, functional connectivity between these orbitofrontal and hippocampal regions was stronger during the encoding of attractive than neutral or unattractive faces. These results suggest that better memory for attractive faces reflects greater interaction between a region associated with reward, the orbitofrontal cortex, and a region associated with successful memory encoding, the hippocampus.

Copyright © 2010 Elsevier Inc. All rights reserved.

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Figures

Fig. 1
Fig. 1
Task paradigm. During encoding, female participants were required to rate the attractiveness of male faces by using the eight-point scale (from 1: very unattractive to 8: very attractive). During retrieval, previously studied and new faces were presented one by one. For each face, participants indicated whether the face was judged as (1) a studied one with high confidence (definitely old: DO), (2) a studied one with low confidence (probably old: PO), (3) an unstudied one with low confidence (probably new: PN), or (4) an unstudied one with high confidence (definitely new: DN).
Fig. 2
Fig. 2
Proportion of hit responses with high confidence. HH: high confidence-hits, HL: low confidence-hits, Error bars represent standard error. *P<0.05, **P<0.01.
Fig. 3
Fig. 3
Attractive-related activity and activation profile in the right orbitofrontal cortex. An activation image of this region is shown on a rendering image of the ventral surface and on a sagittal slice (x=26). Error bars represent standard error.
Fig. 4
Fig. 4
Encoding-related activity and activation profile in the left hippocampus. An activation image of this region is shown on a coronal slice (y=−10). Error bars represent standard error.
Fig. 5
Fig. 5
Correlation between attractiveness-related orbitofrontal activity and encoding-related hippocampal activity, separately for attractive faces (orange), neutral faces (green), and unattractive faces (blue). Orbitofrontal and hippocampal activations were correlated for attractive faces (*P<0.05) but not for neutral and unattractive faces.
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