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. 2021 Jul 22;15:667509. doi: 10.3389/fnhum.2021.667509

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Copyright © 2021 David, Subash, Varadhan, Melendez-Calderon and Balasubramanian.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Different factors affecting the nature of use of the two upper-limbs during daily life. The construct of upper-limb functioning is composed of one's ability, preference, and observable behavior. Behavior is affected by multiple factors: intrinsic and extrinsic factors. Intrinsic factors inherent to a subject, e.g., ability and preference, while extrinsic factors are external to the subject. Measurements of behavior are used by an assessment procedure to estimate upper-limb functioning.