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The relationship between repetition suppression and face perception.

Petra Hermann1,2, Mareike Grotheer3,4, Gyula Kovács3,4,5

  • 1Brain Imaging Centre, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Magyar tudósok körútja 2, Budapest, 1117, Hungary. hermann.petra@ttk.mta.hu.

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Functional magnetic resonance imaging adaptation (fMRIa) in core face processing regions correlates with better face identity discrimination. This suggests fMRIa reflects key processes for recognizing familiar faces.

Keywords:
FFAFace discriminationOFARepetition suppressionfMRI adaptation

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Visual Perception

Background:

  • Repetition of identical faces causes reduced fMRI responses (fMRI adaptation, fMRIa) in core face-selective visual areas like the fusiform face area (FFA) and occipital face area (OFA).
  • The functional significance of fMRIa in these face-processing regions remains incompletely understood.

Purpose of the Study:

  • To investigate the relationship between fMRI adaptation and face perception abilities.
  • To determine if fMRIa in face-selective regions reflects functionally relevant processes for identity discrimination.

Main Methods:

  • Measured fMRI responses and behavioral identity discrimination performance in the same participants for upright and inverted faces.
  • Utilized correlation analysis, controlling for general object perception and visual adaptation using inverted face data.
  • Examined fMRI adaptation in the fusiform face area (FFA), occipital face area (OFA), and extrastriate body area (EBA).

Main Results:

  • A significant positive correlation was found between identity discrimination performance and fMRI adaptation strength in the core face processing network (FFA and OFA).
  • No significant correlation was observed between fMRI adaptation and identity discrimination in the extrastriate body area (EBA).
  • Strong correlations in fMRI adaptation were found between OFA and FFA, and between OFA and EBA, but not between FFA and EBA.

Conclusions:

  • The findings indicate a face-selective component of fMRI adaptation within the core face processing network.
  • This fMRI adaptation appears to reflect functionally relevant processes involved in face identity perception.
  • The results highlight the role of adaptation in distinguishing between familiar and unfamiliar faces.