Visual motion and the human brain: what has neuroimaging told us?
Recently, neuroimaging techniques have been applied to the study of human motion perception, complementing established techniques such as psychophysics, neurophysiology and neuropsychology. Because vision, particularly motion perception, has been studied relatively extensively, it provides an interesting case study to examine the contributions and limitations of neuroimaging to cognitive neuroscience. We suggest that in the domain of motion perception neuroimaging has: (1) revealed an extensive network of motion areas throughout the human brain, in addition to the well-studied motion complex (MT+); (2) verified and extended findings from other techniques; (3) suggested extensive top-down influences on motion perception; and (4) allowed experimenters to examine the neural correlates of awareness. We discuss these contributions, along with limitations and future directions for the neuroimaging of motion.
Culham
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Department of Psychology, University of Western Ontario, London, Ont., Canada N6A 5C2. culham@irus.rri.on.ca
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Dukelow
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Verstraten
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D001288:Attention / Q000502:physiology; D001921:Brain / Q000033:anatomy & histology* / Q000502:physiology*; D003952:Diagnostic Imaging; D006801:Humans; D008279:Magnetic Resonance Imaging; D009039:Motion Perception / Q000502:physiology*; D014796:Visual Perception / Q000502:physiology*