Connectivity-based segmentation of occipito-temporal face selective area
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1
Cuban Neuroscience Center, Cuba
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2
Voice Neurocognition Laboratory, Univ of Glasgow, United Kingdom
A wide swath of human occipito-temporal cortex is selectively activated by faces. Within this face-selective territory, two segments have has been singled out: the occipital face area (OFA) and the fusiform face area (FFA). The boundaries between these two areas are fuzzy and difficult to establish with certainty. However they have different functional properties, so a reasonable hypothesis is that each area is connected to other parts of the brain with a unique pattern. Therefore, a better way to segment the face-selective territory is by clustering voxels according to their anatomical connections. Here, face selective territory was identified by functional magnetic resonance imaging (fMRI) in 10 subjects. Active voxels were then used as seeding points in a diffusion tensor imaging (DTI) probabilistic tractography analysis to ascertain connectivity patterns with 46 other cortical areas. The connections found between face selective voxels and other cortical regions were reproducible between individuals. These face selective voxels were clustered with the FSL procedure (Beherens et al., 2003), revealing distinct subregions within the face-selective occipito-temporal cortex. The clusters encompassing the centroids of OFA and FFA have boundaries that do not correspond with traditional segmentations based on anatomical landmarks.
Keywords:
fMRI,
Perception
Conference:
XI International Conference on Cognitive Neuroscience (ICON XI), Palma, Mallorca, Spain, 25 Sep - 29 Sep, 2011.
Presentation Type:
Poster Presentation
Topic:
Poster Sessions: Neurophysiology of Sensation and Perception
Citation:
Bobes
M,
Valdes-Sosa
M,
Santos
Y,
Sosa
Y,
Quiñones
I,
Iturria
Y and
Belin
P
(2011). Connectivity-based segmentation of occipito-temporal face selective area.
Conference Abstract:
XI International Conference on Cognitive Neuroscience (ICON XI).
doi: 10.3389/conf.fnhum.2011.207.00331
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Received:
23 Nov 2011;
Published Online:
28 Nov 2011.
*
Correspondence:
Dr. Maria Bobes, Cuban Neuroscience Center, Havana, Cuba, antonieta@cneuro.edu.cu