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    Role of features and categories in the organization of object knowledge: Evidence from adaptation fMRI

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    Author
    Geng, Jingyi; Schnur, Tatiana T.
    Date
    2016
    Abstract
    There are two general views regarding the organization of object knowledge. The feature-based view assumes that object knowledge is grounded in a widely distributed neural network in terms of sensory/function features (e.g., Warrington & Shallice, 1984), while the category-based view assumes in addition that object knowledge is organized by taxonomic and thematic categories (e.g., Schwartz etᅠal., 2011). Using a functional magnetic resonance imaging (fMRI) adaptation paradigm, we compared predictions from the feature- and category-based views by examining the neural substrates recruited as subjects read word pairs that were identical, taxonomically related, thematically related or unrelated while controlling for the function features involved across the two categories. We improved upon previous study designs and employed an fMRI adaptation task, obtaining results overall consistent with both the category-based and feature-based views. Consistent with the category-based view, we observed for both hypothesized regions of interest (ROI) and exploratory (whole-brain analyses) reduced activity in the left anterior temporal lobe (ATL) for taxonomically related versus unrelated word pairs, and for the exploratory analysis only, reduced activity in the right ATL. In addition, the exploratory analyses revealed reduced activity in the left temporo-parietal junction (TPJ) for thematically related versus unrelated word pairs. Consistent with the feature-based view, we found in the exploratory analyses that activity reduced in the bilateral precentral gyri (i.e., function regions) including part of premotor cortex as the function relatedness ratings increased. However, we did not find a relationship between adaptation effects in the bilateral ATLs and left TPJ and corresponding ratings of taxonomic/thematic relationships suggesting that the adaptation effects may potentially not reflect aspects of taxonomy that have been traditionally assumed. Together, our findings indicate that both feature and category information are important for the organization of object knowledge although the exact nature of those organization principles is an important question for future research.
    Citation
    Geng, Jingyi and Schnur, Tatiana T.. "Role of features and categories in the organization of object knowledge: Evidence from adaptation fMRI." Cortex, 78, (2016) Elsevier: 174-194. https://doi.org/10.1016/j.cortex.2016.01.006.
    Published Version
    https://doi.org/10.1016/j.cortex.2016.01.006
    Keyword
    Taxonomic category; Thematic category; Features; The organization of object knowledge
    Type
    Journal article
    Publisher
    Elsevier
    Citable link to this page
    https://hdl.handle.net/1911/94169
    Rights
    This is an open access article under the CC BY-NC-ND license
    Link to License
    https://creativecommons.org/licenses/by-nc-nd/4.0/
    Metadata
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    • Department of Psychological Sciences Papers and Publications [169]
    • Faculty Publications [5504]

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    Home | FAQ | Contact Us | Privacy Notice | Accessibility Statement
    Managed by the Digital Scholarship Services at Fondren Library, Rice University
    Physical Address: 6100 Main Street, Houston, Texas 77005
    Mailing Address: MS-44, P.O.BOX 1892, Houston, Texas 77251-1892
    Site Map