Lateral and Medial Ventral Occipitotemporal Regions Interact During the Recognition of Images Revealed from Noise
Abstract
Several studies suggest different functional roles for the medial and the lateral sections of the ventral visual cortex in object recognition. Texture and surface information is processed in medial sections, while shape information is processed in lateral sections. This begs the question whether and how these functionally specialized sections interact with each other and with early visual cortex to facilitate object recognition. In the current research, we set out to answer this question. In an fMRI study, 13 subjects viewed and recognized images of objects and animals that were gradually revealed from noise while their brains were being scanned. We applied dynamic causal modeling (DCM)-a method to characterize network interactions-to determine the modulatory effect of object recognition on a network comprising the primary visual cortex (V1), the lingual gyrus (LG) in medial ventral cortex and the lateral occipital cortex (LO). We found that object recognition modulated the bilateral connectivity between LG and LO. Moreover, the feed-forward connectivity from V1 to LG and LO was modulated, while there was no evidence for feedback from these regions to V1 during object recognition. In particular, the interaction between medial a...Continue Reading
References
Attention to form or surface properties modulates different regions of human occipitotemporal cortex
Primary visual cortex activation on the path of apparent motion is mediated by feedback from hMT+/V5
Separate processing of texture and form in the ventral stream: evidence from FMRI and visual agnosia
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