Linear Integration of Tactile and Non-tactile Inputs Mediates Estimation of Fingertip Relative Position

Frontiers in Neuroscience
Simone TomaMarco Santello

Abstract

While skin, joints and muscles receptors alone provide lower level information about individual variables (e.g., exerted limb force and limb displacement), the distance between limb endpoints (i.e., relative position) has to be extracted from high level integration of somatosensory and motor signals. In particular, estimation of fingertip relative position likely involves more complex sensorimotor transformations than those underlying hand or arm position sense: the brain has to estimate where each fingertip is relative to the hand and where fingertips are relative to each other. It has been demonstrated that during grasping, feedback of digit position drives rapid adjustments of fingers force control. However, it has been shown that estimation of fingertips' relative position can be biased by digit forces. These findings raise the question of how the brain combines concurrent tactile (i.e., cutaneous mechanoreceptors afferents induced by skin pressure and stretch) and non-tactile (i.e., both descending motor command and joint/muscle receptors signals associated to muscle contraction) digit force-related inputs for fingertip distance estimation. Here we addressed this question by quantifying the contribution of tactile and non-...Continue Reading

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Citations

Apr 11, 2019·Journal of Neurophysiology·Trevor Lee-MillerAndrew M Gordon
Nov 2, 2019·The Journal of Physiology·Annie A ButlerSimon C Gandevia
Jan 27, 2021·Neuroscience and Biobehavioral Reviews·Helen O'Shea, Stephen J Redmond
Apr 24, 2021·Scientific Reports·Trevor Lee-MillerAndrew M Gordon

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