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Predictions enable top-down pattern separation in the macaque face-processing hierarchy

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  • Tarana Nigam

    (European Neuroscience Institute Göttingen – A Joint Initiative of the University Medical Center Göttingen and the Max Planck Institute for Multidisciplinary Sciences
    German Primate Center – Leibniz Institute for Primate Research
    Leibniz ScienceCampus ‘Primate Cognition’
    Georg August University Göttingen)

  • Caspar M. Schwiedrzik

    (European Neuroscience Institute Göttingen – A Joint Initiative of the University Medical Center Göttingen and the Max Planck Institute for Multidisciplinary Sciences
    German Primate Center – Leibniz Institute for Primate Research
    Leibniz ScienceCampus ‘Primate Cognition’)

Abstract

Distinguishing faces requires well distinguishable neural activity patterns. Contextual information may separate neural representations, leading to enhanced identity recognition. Here, we use functional magnetic resonance imaging to investigate how predictions derived from contextual information affect the separability of neural activity patterns in the macaque face-processing system, a 3-level processing hierarchy in ventral visual cortex. We find that in the presence of predictions, early stages of this hierarchy exhibit well separable and high-dimensional neural geometries resembling those at the top of the hierarchy. This is accompanied by a systematic shift of tuning properties from higher to lower areas, endowing lower areas with higher-order, invariant representations instead of their feedforward tuning properties. Thus, top-down signals dynamically transform neural representations of faces into separable and high-dimensional neural geometries. Our results provide evidence how predictive context transforms flexible representational spaces to optimally use the computational resources provided by cortical processing hierarchies for better and faster distinction of facial identities.

Suggested Citation

  • Tarana Nigam & Caspar M. Schwiedrzik, 2024. "Predictions enable top-down pattern separation in the macaque face-processing hierarchy," Nature Communications, Nature, vol. 15(1), pages 1-13, December.
  • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-51543-y
    DOI: 10.1038/s41467-024-51543-y
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    References listed on IDEAS

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