title: Extrinsic tau-coupling and the regulation of interceptive reaching under varying task constraints.
abstract: We investigated a general theory accounting for the guidance of ongoing movements in an interceptive reaching task. The aim was to assess the premise of tau-coupling that the coupling constant k, the ratio of taus (τs) of motion gaps between hand and object, reflects the kinematics of the on-going movement. The spatial and temporal constraints of the interceptive action were manipulated in three task conditions. While the time dependent counterpart of k, K(t) exhibited task effects, k itself could not distinguish between task manipulations. K(t) showed large variability during the initial acceleration phase, small variability during the rest of the movement, and task dependent changes during the final deceleration phase of interception. The findings highlight the importance of clarifying what constitutes as t-coupling.
authors.affiliation: Center for Human Movement Sciences, University Medical Center Groningen, Groningen, Netherlands.
authors.forename: Joanne
authors.initials: J
authors.lastname: Smith
authors.forename: Madeleine
authors.initials: M
authors.lastname: Grealy
authors.forename: Gert-Jan
authors.initials: GJ
authors.lastname: Pepping
mesh_terms: D000328:Adult; D001696:Biomechanical Phenomena; D005260:Female; D006225:Hand / Q000502:physiology; D006801:Humans; D008297:Male; D009039:Motion Perception / Q000502:physiology; D009068:Movement / Q000502:physiology*; D011597:Psychomotor Performance / Q000502:physiology*