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  • Title: Selective and interactive neural correlates of visual dimension changes and response changes.
    Author: Pollmann S, Weidner R, Müller HJ, Maertens M, von Cramon DY.
    Journal: Neuroimage; 2006 Mar; 30(1):254-65. PubMed ID: 16263311.
    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.
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