Task Constraints Act at the Level of Synergies and at the Level of End-Effector Kinematics in Manual Reaching and Manual Lateral Interception

Inge Tuitert*, Laura Golenia, Egbert Otten, Reinoud J. Bootsma, Raoul M. Bongers

*Corresponding author voor dit werk

OnderzoeksoutputAcademicpeer review

2 Citaten (Scopus)

Samenvatting

To coordinate the redundant degrees of freedom (DOF) in the action system, synergies are often proposed. Synergies organize DOF in temporary task-specific units emerging from interactions among task, organism, and environmental constraints. We examined whether task constraints affect synergies, end-effector kinematics, or both. To this end, we compared synergies and end-effedor kinematics when participants (N = 15) performed discrete movements of identical amplitude in manual reaching (stationary targets) and manual lateral interception (moving targets, with different angles of approach). We found that time-velocity profiles were roughly symmetric in teaching, whereas they had a longer decelerative tail and showed an angle-of-approach effect in interception. Uncontrolled manifold analyses showed that in all conditions joint angle variability was primarily awariation, indicating a synergistic organization. The analysis on the clusters of joint angle configurations demonstrated differences between reaching and interception synergies, whereas more similar synergies were used within interception conditions. This implies that some task constraints operate at the level of synergies while other task constraints only affect end-effector kinematics. The results support a 2-step process in the organization of DOF, consisting of synergy formation and further constraining of synergies to produce the actual movement, as proposed by Kay (1988).

Originele taal-2English
Pagina's (van-tot)1511-1526
Aantal pagina's16
TijdschriftJOURNAL OF EXPERIMENTAL PSYCHOLOGY-HUMAN PERCEPTION AND PERFORMANCE
Volume46
Nummer van het tijdschrift12
DOI's
StatusPublished - dec.-2020

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