Document Detail

Direction-selective patterns of activity in human visual cortex suggest common neural substrates for different types of motion.
MedLine Citation:
PMID:  21945806     Owner:  NLM     Status:  MEDLINE    
A sense of motion can be elicited by the movement of both luminance- and texture-defined patterns, what is commonly referred to as first- and second-order, respectively. Although there are differences in the perception of these two classes of motion stimuli, including differences in temporal and spatial sensitivity, it is debated whether common or separate direction-selective mechanisms are responsible for processing these two types of motion. Here, we measured direction-selective responses to luminance- and texture-defined motion in the human visual cortex by using functional MRI (fMRI) in conjunction with multivariate pattern analysis (MVPA). We found evidence of direction selectivity for both types of motion in all early visual areas (V1, V2, V3, V3A, V4, and MT+), implying that none of these early visual areas is specialized for processing a specific type of motion. More importantly, linear classifiers trained with cortical activity patterns to one type of motion (e.g., first-order motion) could reliably classify the direction of motion defined by the other type (e.g., second-order motion). Our results suggest that the direction-selective mechanisms that respond to these two types of motion share similar spatial distributions in the early visual cortex, consistent with the possibility that common mechanisms are responsible for processing both types of motion.
Sang Wook Hong; Frank Tong; Adriane E Seiffert
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Publication Detail:
Type:  Journal Article; Research Support, American Recovery and Reinvestment Act; Research Support, N.I.H., Extramural     Date:  2011-09-17
Journal Detail:
Title:  Neuropsychologia     Volume:  50     ISSN:  1873-3514     ISO Abbreviation:  Neuropsychologia     Publication Date:  2012 Mar 
Date Detail:
Created Date:  2012-02-21     Completed Date:  2012-07-17     Revised Date:  2014-09-15    
Medline Journal Info:
Nlm Unique ID:  0020713     Medline TA:  Neuropsychologia     Country:  England    
Other Details:
Languages:  eng     Pagination:  514-21     Citation Subset:  IM    
Copyright Information:
Copyright © 2011 Elsevier Ltd. All rights reserved.
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MeSH Terms
Brain Mapping
Image Processing, Computer-Assisted
Magnetic Resonance Imaging
Motion Perception / physiology*
Neurons / physiology*
Photic Stimulation
Visual Cortex / physiology*
Grant Support
P30 EY008126/EY/NEI NIH HHS; P30 EY008126/EY/NEI NIH HHS; P30 EY008126-19/EY/NEI NIH HHS; R01 EY014984/EY/NEI NIH HHS; R01 EY014984-03/EY/NEI NIH HHS; R01 EY017082/EY/NEI NIH HHS; R01 EY017082/EY/NEI NIH HHS; R01 EY017082-03/EY/NEI NIH HHS; R01 EY017082-03S1/EY/NEI NIH HHS; R01 EY017082-03S1/EY/NEI NIH HHS

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