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| Home > Publications database > Selective and interactive neural correlates of visual dimension changes and response changes |
| Journal Article | PreJuSER-57791 |
; ; ; ;
2006
Academic Press
Orlando, Fla.
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Please use a persistent id in citations: doi:10.1016/j.neuroimage.2005.09.013
Abstract: In an event-related fMRI study, we investigated the neural correlates of visual dimension and response changes. We used a compound task, which required target selection by a singleton feature, a unique color or motion direction, before the appropriate motor response, which was determined by target orientation, could be selected. Both types of change elicited distinct patterns of activation, with dimension-change-related activation primarily in posterior visual areas and response-related activation primarily in motor-related areas of the parietal and frontal cortices. Response-change-related activation was delayed by about 1 s relative to dimension-change-related activation, suggesting that the latter is elicited by perceptual processes, whereas the former reflects response-related or post-response processes. Although dimension changes and response changes rely on different processes, they are not independent: response facilitation was observed for combined dimension and response repetitions, this facilitation, however, was disrupted by dimension changes.
Keyword(s): Adult (MeSH) ; Attention: physiology (MeSH) ; Brain: physiology (MeSH) ; Brain Mapping (MeSH) ; Cerebral Cortex: physiology (MeSH) ; Color Perception: physiology (MeSH) ; Echo-Planar Imaging (MeSH) ; Female (MeSH) ; Frontal Lobe: physiology (MeSH) ; Humans (MeSH) ; Image Processing, Computer-Assisted (MeSH) ; Magnetic Resonance Imaging (MeSH) ; Male (MeSH) ; Motion Perception: physiology (MeSH) ; Motor Cortex: physiology (MeSH) ; Nerve Net: physiology (MeSH) ; Orientation: physiology (MeSH) ; Oxygen: blood (MeSH) ; Pattern Recognition, Visual: physiology (MeSH) ; Reaction Time: physiology (MeSH) ; Visual Pathways: physiology (MeSH) ; Oxygen ; J
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