title: Sensori-motor strategic variations and sequential effects in young and older adults performing a Fitts' task.
abstract: The present study aimed at investigating age-related changes in strategic variations and sequential effects in discrete Fitts' aiming task. Three sequential effects were investigated, namely trial sequential difficulty effects (TSDE), strategy sequential difficulty effects (SSDE), and strategy repetition effects (SRE). After generalizing previously observed aging effects on strategic variations, our results showed that movement times were longer when performed after harder ID level than when following easier ID level (TSDE). We also observed SSDE, such that is movement times were longer when participants executed a strategy of intermediate difficulty (i.e., the progressive-deceleration strategy) after having used a more difficult strategy (i.e., the undershoot strategy) on the previous trial than after an easier strategy (i.e., the one-shot strategy). These sequential difficulty effects related to both difficulty and strategy were similar in young and older adults. In addition, we found that across two successive trials, participants tended to repeat the one-shot strategy the most often and the undershoot strategy the least often, with repetition rates of the progressive-deceleration strategy being in-between (SRE). Finally, age-related differences in strategy repetition effects varied with strategies (e.g., they were largest for the one-shot strategy). These findings have important implications for deciphering processes responsible for sequential effects in sensori-motor tasks as well as in cognitive tasks in general, and for our understanding of processes underlying sensori-motor performance in young and older adults.
authors.affiliation: Aix-Marseille Université, CNRS, UMR 7290, & IUF, 13331 Marseille Cedex 03, France; Aix-Marseille Université, CNRS, ISM UMR 7287, 13288 Marseille Cedex 09, France.
authors.forename: Céline
authors.initials: C
authors.lastname: Poletti
authors.affiliation: Aix-Marseille Université, CNRS, ISM UMR 7287, 13288 Marseille Cedex 09, France; Aix-Marseille Université, Inserm, INS UMR 1106, 13385 Marseille Cedex 05, France.
authors.forename: Rita
authors.initials: R
authors.lastname: Sleimen-Malkoun
authors.affiliation: Aix-Marseille Université, CNRS, UMR 7290, & IUF, 13331 Marseille Cedex 03, France.
authors.forename: Patrick
authors.initials: P
authors.lastname: Lemaire
authors.affiliation: Aix-Marseille Université, CNRS, ISM UMR 7287, 13288 Marseille Cedex 09, France. Electronic address: jean-jacques.temprado@univ-amu.fr.
authors.forename: Jean-Jacques
authors.initials: JJ
authors.lastname: Temprado
mesh_terms: D000328:Adult; D000368:Aged; D000375:Aging / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009068:Movement / Q000502:physiology*; D011597:Psychomotor Performance / Q000502:physiology*; D055815:Young Adult
keywords: Aging; Fitts' task; Kinematic strategies; Sequential effects