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    Neural correlates of binding features within- or cross-dimensions in visual conjunction search: an fMRI study

    Wei, P. and Muller, Hermann J. and Pollmann, S. and Zhou, X. (2011) Neural correlates of binding features within- or cross-dimensions in visual conjunction search: an fMRI study. NeuroImage 57 (1), pp. 235-241. ISSN 1053-8119.

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    The fMRI technique was used to investigate the functional neuroanatomy of binding features within- or cross-dimension during visual conjunction search. Participants were asked to perform feature search (FS; e.g., search for a vertical bar among tilted bars), within-dimension search (WS; e.g., search for an upright T among non-target oriented Ts and Ls), cross-dimension search (CS; e.g., search for an orange vertical bar among blue vertical bars and orange tilted bars), and complex search combining within- and cross-dimension features (WCS; e.g., search for an orange upright T among orange leftward Ts and blue Ls). Reaction times (RTs) taken to decide whether a target was present or absent were faster in the FS than in the WS, CS, and WCS conditions, but did not differ between the latter three conditions. Neuroimaging results revealed a set of fronto-parietal regions, including frontal eye field and intraparietal sulcus, to be consistently activated in conjunction search (WS, CS, and WCS) relative to feature search, suggesting that these regions play a more prominent role in matching visual input against the target template in conjunction search. Furthermore, left occipito-temporal cortex was more activated in within-dimension conjunction search, and bilateral intraparietal sulci were more activated in cross-dimension conjunction search. This suggests that features from the same dimension are ‘bound’ at a higher stage of the ventral pathway by conjoining the inputs from lower-level neurons, whereas neurons along the intraparietal sulcus appear to be necessary for discerning the presence of cross-dimensional conjunctions.


    Item Type: Article
    Keyword(s) / Subject(s): visual search, feature search, conjunction search, within-dimension conjunction, cross-dimension conjunction, fMRI
    School: School of Science > Psychological Sciences
    Depositing User: Sarah Hall
    Date Deposited: 03 Nov 2015 16:19
    Last Modified: 14 Nov 2016 13:33


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