Résumé
Augmented sensory feedback can support motor control in complex actions, yet its effects during multi-phase sequential reaching in younger adults remain underexplored. This study investigated how auditory and vibrotactile feedback influence performance across varying task complexities of one- and two-target tasks. Twenty-four younger adults (aged 19-35 years) participants performed five target tasks under three feedback conditions: no feedback (NF), auditory (A), and vibrotactile (VT). Position data were captured via an Optotrak 3D motion-tracker and analyzed using repeated measures ANOVAs. Reaction time (RT) was significantly influenced by sensory condition(F2,46=6.67,p=.00), with shorter RTs in the NF condition compared to the A or VT conditions.Task type also affected RT (F4,92 =6.94,p=.00), with the shortest initiation time in the two-target single-hand extension (2T1He) condition. Movement time to the second target was shortest in the two-target single-hand reversal task (2T1Hr) and longest in the two-target two-hand extension task (2T2He) (F3,69=17.67, p=.00). Importantly, VT feedback significantly shortened time after peak velocity during the second movement (TAPV2; F2,46=4.23, p=.02), supporting faster movement termination. However, during the first movement segment, TAPV1 was longer in the VT condition than in NF, specifically in the 2T1Hr task (p = .05), suggesting greater reliance on feedback to guide deceleration. Constant error also increased in more complex movements (p =.001). These findings suggest that vibrotactile (VT) feedback enhances motor control in complex tasks, highlighting its potential to support performance in human-computer interaction, as well as in everyday reaching movements and activities of daily living.
