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fMRI evidence that hyper-caricatured faces activate object-selective cortex.

Ryan Elson1, Denis Schluppeck1, Alan Johnston1

  • 1School of Psychology, University of Nottingham, Nottingham, United Kingdom.

Frontiers in Psychology
|January 30, 2023
PubMed
Summary
This summary is machine-generated.

Caricatured faces did not alter average brain responses in face-selective areas but increased pattern consistency in object-selective regions. This suggests caricatured faces engage object processing areas by enhancing low-level features.

Keywords:
PCAcaricatured facesfMRIface spacefacesobject-selective cortex

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Brain Imaging

Background:

  • Cortical responses to object categories and faces are well-studied.
  • Face space models represent individual faces relative to an average face.
  • Responses to highly caricatured faces remain underexplored.

Purpose of the Study:

  • Investigate brain responses to faces varying in caricature level.
  • Determine if increasing face caricature affects face-selective and object-selective regions.
  • Explore the impact of facial inversion on neural responses.

Main Methods:

  • Generated caricatured faces using principal component analysis (PCA) within a face space.
  • Utilized functional magnetic resonance imaging (fMRI) to measure brain activity.
  • Defined face-, object-, and scene-selective areas using a localizer scan.

Main Results:

  • Increased caricature led to more consistent fMRI response patterns in the right fusiform face area (FFA).
  • No significant effect of caricature level or inversion on average fMRI response in FFA or other face-selective regions.
  • Object-selective regions showed increased response pattern consistency and average fMRI response with higher caricature levels.

Conclusions:

  • Highly caricatured faces enhance processing in object-selective regions, potentially by emphasizing object-like low-level features.
  • Neural responses to faces in FFA do not consistently increase with caricaturing.
  • Caricatured faces may recruit object processing pathways, indicating flexible neural recruitment.