Dec 19, 2014

Faciotopy—a face-feature map with face-like topology in the human occipital face area

BioRxiv : the Preprint Server for Biology
Linda HenrikssonNikolaus Kriegeskorte

Abstract

The occipital face area (OFA) and fusiform face area (FFA) are brain regions thought to be specialized for face perception. However, their intrinsic functional organization and status as cortical areas with well-defined boundaries remains unclear. Here we test these regions for ?faciotopy?, a particular hypothesis about their intrinsic functional organisation. A faciotopic area would contain a face-feature map on the cortical surface, where cortical patches represent face features and neighbouring patches represent features that are physically neighbouring in a face. The faciotopy hypothesis is motivated by the idea that face regions might develop from a retinotopic protomap and acquire their selectivity for face features through natural visual experience. Faces have a prototypical configuration of features, are usually perceived in a canonical upright orientation, and are frequently fixated in particular locations. To test the faciotopy hypothesis, we presented images of isolated face features at fixation to subjects during functional magnetic resonance imaging. The responses in V1 were best explained by low-level image properties of the stimuli. OFA, and to a lesser degree FFA, showed evidence for faciotopic organization. Whe...Continue Reading

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Mentioned in this Paper

Body Regions
Cortex Bone Disorders
Adrenal Cortex Diseases
Occipital Lobe
Magnetic Resonance Imaging
Entire Retina
Brain
Face
Sample Fixation
Region of Face

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