Guided by touch: Tactile Cues in Hand Movement Control - Archive ouverte HAL
Pré-Publication, Document De Travail Année : 2024

Guided by touch: Tactile Cues in Hand Movement Control

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Traditionally, touch is associated with exteroception and is rarely considered a relevant sensory cue for controlling movements in space, unlike vision. We developed a technique to isolate and evaluate tactile involvement in controlling sliding finger movements over a surface. Young adults traced a 2D shape with their index finger under direct or mirror-reversed visual feedback to create a conflict between visual and somatosensory inputs. In this context, increased reliance on somatosensory input compromises movement accuracy. Based on the hypothesis that tactile cues contribute to guiding hand movements, we predicted poorer performance when the participants traced with their bare finger compared to when their tactile sensation was dampened using a smooth finger splint. The results supported this prediction. EEG source analyses revealed smaller current in the presumed somatosensory cortex during sensory conflict, but only when the finger directly touched the surface. This finding suggests the gating of task-irrelevant somatosensory inputs. Together, our results emphasize touch's involvement in movement control, challenging the notion that vision predominantly governs goaldirected hand or finger movements.
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hal-04677760 , version 1 (26-08-2024)

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Maria Evangelia Vlachou, Juliette Legros, Cécile Sellin, Dany Paleressompoulle, Francesco Massi, et al.. Guided by touch: Tactile Cues in Hand Movement Control. 2024. ⟨hal-04677760⟩
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