Skip to main content
Dryad logo

Separability of human motor memories during reaching adaptation with force cues

Citation

Crevecoeur, Frederic; Mathew, James; Lefèvre, Philippe (2022), Separability of human motor memories during reaching adaptation with force cues, Dryad, Dataset, https://doi.org/10.5061/dryad.b2rbnzsk3

Abstract

Judging by the breadth of our motor repertoire during daily activities, it is clear that learning different tasks is a hallmark of the human motor system. However, for reaching adaptation to different force fields, the conditions under which this is possible in laboratory settings have remained a challenging question. Previous work has shown that independent movement representations or goals enabled dual adaptation. Considering the importance of force feedback during limb control, here we hypothesised that independent cues delivered by means of background loads could support simultaneous adaptation to various velocity-dependent force fields, for identical kinematic plan and movement goal. We demonstrate in a series of experiments that indeed healthy adults can adapt to opposite force fields, independently of the direction of the background force cue. However, when the cue and force field were in the same direction but differed by their magnitude, the formation of different motor representations was still observed but the associated mechanism was subject to increased interference. Finally, we highlight that this paradigm allows dissociating trial-by-trial adaptation from online feedback adaptation, as these two mechanisms are associated with different time scales that can be identified reliably and reproduced in a computational model. 

Methods

All information about data collection is provided in the original reference. 

Usage Notes

Data structures were generated with Matlab in format *.m.

Funding

Fonds De La Recherche Scientifique - FNRS

Université Catholique de Louvain, Award: Concerted Research Action