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• W2941001531 abstract "ABSTRACT Humans are unique in their ability to perform dexterous object manipulation in a wide variety of scenarios. However, previous work has used a grasping context that predominantly elicits memory-based control of digit forces by constraining where the object should be grasped. For this ‘constrained’ grasping context, primary motor cortex (M1) is involved in storage and retrieval of digit forces used in previous manipulations. In contrast, when choice of digit contact points is allowed (‘unconstrained’ grasping), behavioral studies revealed that forces are adjusted, on a trial-to-trial basis, as a function of digit position. This suggests a role of online feedback that detects digit position, rather than memory, for force control. However, despite the ubiquitous nature of unconstrained hand-object interactions in activities of daily living, the underlying neural mechanisms are unknown. Using non-invasive brain stimulation and electroencephalography, we found the role of M1 to be sensitive to grasping condition. While confirming the role of M1 in storing and retrieving learned digit forces and position in ‘constrained’ grasping, we also found that M1 is involved in modulating digit forces to digit position in unconstrained grasping. Furthermore, we found that digit force modulation to position relies on sensorimotor integration mediated by primary sensory cortex (S1) and M1. This finding supports the notion of a greater contribution of somatosensory feedback of digit position in unconstrained grasping. We conclude that the relative contribution of memory and online feedback based on whether contact points are constrained or unconstrained modulates sensorimotor cortical interactions for dexterous manipulation." @default.
• W2941001531 created "2019-05-03" @default.
• W2941001531 creator A5024992097 @default.
• W2941001531 creator A5028595522 @default.
• W2941001531 creator A5046482171 @default.
• W2941001531 date "2019-04-29" @default.
• W2941001531 modified "2023-09-28" @default.
• W2941001531 title "Choice of Contact Points Modulates Sensorimotor Cortical Interactions for Dexterous Manipulation" @default.
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• W2941001531 doi "https://doi.org/10.1101/621466" @default.
• W2941001531 hasPublicationYear "2019" @default.
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