Theoretical evidence supporting harmonic reaching trajectories

Tiseo, Carlo, Charitos, Sydney Rebecca and Mistry, Michael (2021) Theoretical evidence supporting harmonic reaching trajectories. International IEEE/EMBS Conference on Neural Engineering, Italy, 4-6 May 2021. Published in: 2021 10th International IEEE/EMBS Conference on Neural Engineering (NER). 2021-M 823-827. IEEE ISSN 1948-3546 ISBN 9781728143385

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Minimum Jerk trajectories have been long thought to be the reference trajectories for human movements due to their impressive similarity with human movements. Nevertheless, minimum jerk trajectories are not the only choice for C∞ (i.e., smooth) functions. For example, harmonic trajectories are smooth functions that can be superimposed to describe the evolution of physical systems. This paper analyses the possibility that motor control plans using harmonic trajectories, will be experimentally observed to have a minimum jerk likeness due to control signals being transported through the Central Nervous System (CNS) and muscle-skeletal system. We tested our theory on a 3-link arm simulation using a recently developed planner that we reformulated into a motor control architecture, inspired by the passive motion paradigm. The arm performed 100 movements, reaching for each target defined by the clock experiment. We analysed the shape of the trajectory planned in the CNS and executed in the physical simulator. We observed that even under ideal conditions (i.e., absence of delays and noise) the executed trajectories are similar to a minimum jerk trajectory; thus, supporting the thesis that the human brain might plan harmonic trajectories.

Item Type: Conference Proceedings
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Schools and Departments: School of Engineering and Informatics > Engineering and Design
SWORD Depositor: Mx Elements Account
Depositing User: Mx Elements Account
Date Deposited: 20 Dec 2021 10:13
Last Modified: 04 Mar 2022 17:01

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