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Holistic Facial Composite Creation and Subsequent Video Line-up Eyewitness Identification Paradigm
09:49

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Published on: December 24, 2015

Covert face recognition without the fusiform-temporal pathways.

Mitchell Valdés-Sosa1, Maria A Bobes, Ileana Quiñones

  • 1Cuban Center for Neuroscience, Havana, Cuba. mitchell@cneuro.edu.cu

Neuroimage
|May 17, 2011
PubMed
Summary
This summary is machine-generated.

Individuals with prosopagnosia show hidden face recognition despite conscious inability. A novel occipito-frontal pathway may explain this covert face processing.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Neuroimaging

Background:

  • Prosopagnosia, or face blindness, impairs conscious facial recognition.
  • Covert face recognition abilities persist in some patients, but the underlying neural mechanisms remain unclear.
  • The fusiform face area (FFA) and its connections are crucial for conscious face identification.

Purpose of the Study:

  • To investigate the neural substrates of covert face recognition in a patient with severe prosopagnosia.
  • To identify the brain pathways supporting residual face identification abilities.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) and diffusion tensor imaging (DTI) were used.
  • A single patient (FE) with severe prosopagnosia and bilateral fusiform gyrus lesions was studied.
  • Brain activity and connectivity related to face perception were analyzed.

Main Results:

  • Massive bilateral lesions destroyed the patient's FFAs and disrupted the typical fusiform-temporal pathway.
  • Despite lesioning, face-selective activations persisted in occipital and extended face system areas (posterior cingulate, orbitofrontal cortex).
  • A partially preserved occipito-frontal pathway connected these surviving face-selective areas in the right hemisphere.

Conclusions:

  • The typical fusiform-temporal pathway is not necessary for covert face recognition.
  • A novel occipito-frontal pathway may mediate covert face recognition in prosopagnosia.
  • This alternative pathway could also play a role in unconscious face processing during normal cognition.