| Reference code: | PT/FB/BL-2014-184.07 |
| Location: | BF-GMS
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Title:
| Hand-selective areas of both dorsal and ventral visual streams represent how to appropriately grasp 3D tools
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| Publication year: | 2018
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URL:
| https://www.abstractsonline.com/pp8/#!/4649/presentation/40022
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| Abstract/Results: | ABSTRACT:
Tools are manipulable objects that, unlike other objects in the world (e.g., buildings), are tightly linked to highly predictable action procedures. Neuroimaging has revealed a left-lateralized network of dorsal and ventral visual stream regions for tool-use and tool-knowledge tasks, but the exact role of these regions remains unclear. Moreover, studies involving actual hand actions with real tools are rare as most research to date used proxies for tool-use including presenting visual stimuli (e.g., pictures) or action simulation (e.g., pantomime). Here we investigated with real 3D tools, whether the human brain represents actual object-specific functional grasps, using functional magnetic resonance imaging (fMRI) with multi-voxel pattern analysis (MVPA). Specifically, we tested if patterns of brain activity would differ depending on whether the grasp was consistent or inconsistent with how tools are typically grasped for use (e.g., grasp knife by handle rather than by its serrated edge). In a block-design fMRI paradigm, 19 participants grasped the left or right sides of 3D-printed tools (kitchen utensils) and non-tool objects (bar-shaped objects) with the right-hand. Importantly, and unknown to participants, by varying movement direction (right/left) the tool grasps were performed in either a typical (by the handle) or atypical (by the business end) manner. In addition, for each participant separate perceptual localizer runs were obtained to functionally define regions of interest (ROI). ROI MVPA showed that typical vs. atypical grasping could be decoded significantly higher for tools than non-tools in hand-selective (but not tool-, body- or object-selective) regions of the left lateral occipital temporal cortex (LOTC) and intraparietal sulcus (IPS). Whole-brain searchlight MVPA also identified representations of typicality for tool grasping in bilateral inferior parietal lobule and inferior temporal gyrus, right middle occipital and inferior frontal gyri and left anterior temporal lobe (ATL). Together these findings indicate that representations of how to appropriately grasp tools are automatically evoked (even when irrelevant to task performance) throughout specific regions within the tool network, left ATL and left hand-selective regions of LOTC and IPS.
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| Accessibility: | Document does not exist in file
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Language:
| eng
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Author:
| Knights, E.
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Secondary author(s):
| Smith, F. W., Mansfield, C., Tonin, D., Weaver, H., Rossit, S.
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Document type:
| Online abstract
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Number of reproductions:
| 1
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Reference:
| Knights, E., Smith, F. W., Mansfield, C., Tonin, D., Weaver, H., & Rossit, S. (2018). Hand-selective areas of both dorsal and ventral visual streams represent how to appropriately grasp 3D tools. Program No. 270.09. 2018 Neuroscience Meeting Planner. San Diego, CA: Society for Neuroscience, 2018. Online. Abstract retrieved from https://www.abstractsonline.com/pp8/#!/4649/presentation/40022
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| Indexed document: | No
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| Keywords: | fMRI / Tool use / Multi-voxel pattern analysis (MVPA) / Grasping
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