Figure 1.

Illustration of experimental design. (A) An overview of the experimental flow as shown in the diagram. Questionnaires: Participants completed the Montreal Cognitive Assessment (MoCA), Edinburgh Handedness Test (EHT), and International Physical Activity Questionnaire (IPAQ) and gave information about their sleep duration and quality the previous night. The motor test battery included the Purdue Pegboard Test (PPT), a 30 s sit-to-stand test (STS), and a hand grip force assessment (GF). The Cognitive test battery used the Cambridge Neuropsychological Test Automated Battery (CANTAB) and tested memory (paired associative learning), attention (rapid visual information), and reaction time (RT). Finally, all participants completed three blocks of the bimanual pinch task. Rest intervals between the individual sections were self-paced by the participant, but never exceeded 5 min. (B) Three different conditions during the bimanual pinch force task where pinch movements either could be performed only with the right hand, mirror symmetrically with both hands, and inverse-asymmetrically with both hands. (C) The average force traces of a single subject during the inverse-asymmetrical condition.