Large postural sways prevent foot tactile information from fading: neurophysiological evidence - Archive ouverte HAL Access content directly
Journal Articles Cerebral Cortex Communications Year : 2021

Large postural sways prevent foot tactile information from fading: neurophysiological evidence

Abstract

Cutaneous foot receptors are important for balance control, and their activation during quiet standing depends on the speed and the amplitude of postural oscillations. We hypothesized that the transmission of cutaneous input to the cortex is reduced during prolonged small postural sways due to receptor adaptation during continued skin compression. Central mechanisms would trigger large sways to reactivate the receptors. We compared the amplitude of positive and negative post-stimulation peaks (P 50 N 90) somatosensory cortical potentials evoked by the electrical stimulation of the foot sole during small and large sways in 16 young adults standing still with their eyes closed. We observed greater P 50 N 90 amplitudes during large sways compared with small sways consistent with increased cutaneous transmission during large sways. Postural oscillations computed 200 ms before large sways had smaller amplitudes than those before small sways, providing sustained compression within a small foot sole area. Cortical source analyses revealed that during this interval, the activity of the somatosensory areas decreased, whereas the activity of cortical areas engaged in motor planning (supplementary motor area, dorsolateral prefrontal cortex) increased. We concluded that large sways during quiet standing represent self-generated functional behavior aiming at releasing skin compression to reactivate mechanoreceptors. Such balance motor commands create sensory reafference that help control postural sway.
Fichier principal
Vignette du fichier
2021 Cerebral Cortex Comm (Fabre).pdf (1.58 Mo) Télécharger le fichier
Origin Publisher files allowed on an open archive

Dates and versions

hal-03097070 , version 1 (23-02-2021)

Identifiers

Cite

Marie Fabre, Marine Antoine, Mathieu Germain Robitaille, Edith Ribot-Ciscar, Rochelle Ackerley, et al.. Large postural sways prevent foot tactile information from fading: neurophysiological evidence. Cerebral Cortex Communications, 2021, 2 (1), ⟨10.1093/texcom/tgaa094⟩. ⟨hal-03097070⟩
105 View
77 Download

Altmetric

Share

Gmail Mastodon Facebook X LinkedIn More