Learning to stand with unexpected sensorimotor delays

Rasman, Brandon G.; Forbes, Patrick A.; Peters, Ryan M.; Ortiz, Oscar; Franks, Ian M.; Inglis, James; Chua, Romeo; Blouin, Jean‐Sébastien

doi:10.7554/elife.65085

Cited by 14 publications

(34 citation statements)

References 89 publications

(150 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Participants stood upright on robotic apparatuses designed to simulate the control of standing balance with the mechanics of an inverted pendulum restricted to anterior-posterior motion (Fig. 1) (20,(27)(28)(29). The robots applied the self-generated (i.e.…”

Section: Methodsmentioning

confidence: 99%

“…Here, we aimed to reveal the principles underlying our sense of standing balance by quantifying perceptual thresholds to perturbations inducing context-dependent ambiguous or unambiguous cues of self-motion. Healthy participants stood immobile or balanced freely on a robotic balance simulator (27)(28)(29)(30) while their perception thresholds to imposed whole-body or ankle perturbations were measured across a range of perturbation velocities. We estimated perception thresholds to the imposed perturbations by fitting the data with psychometric curves.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Unperceived motor actions of the balance system interfere with the causal attribution of self-motion

et al. 2022

Self Cite

View full text Add to dashboard Cite

The instability of human bipedalism demands that the brain accurately senses balancing self-motion and determines whether movements originate from self-generated actions or external disturbances. Here, we challenge the longstanding notion that this process relies on a single representation of the body and world to accurately perceive postural orientation and organize motor responses to control balance self-motion. Instead, we find that the conscious sense of balance can be distorted by the corrective control of upright standing. Using psychophysics, we quantified thresholds to imposed perturbations and balance responses evoking cues of self-motion that are (in)distinguishable from corrective balance actions. When standing immobile, participants clearly perceived imposed perturbations. Conversely, when freely balancing, participants often misattributed their own corrective responses as imposed motion because their balance system had detected, integrated and responded to the perturbation in the absence of conscious perception. Importantly, this only occurred for perturbations encoded ambiguously with balance-correcting responses and that remained below the natural variability of ongoing balancing oscillations. These findings reveal that our balance system operates on its own sensorimotor principles that can interfere with causal attribution of our actions, and that our conscious sense of balance depends critically on the source and statistics of induced and self-generated motion cues.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Unperceived motor actions of the balance system interfere with the causal attribution of self-motion

et al. 2022

Self Cite

View full text Add to dashboard Cite

show abstract

“…The poor balance ability of middle-aged and older people can be traced back to many possible reasons. With increasing age, the muscles of the vestibular-evoked responses will be delayed, resulting in a decline in balance ability ( 17 ). Multiple systems were affected by chronic inflammatory states and oxidative imbalances ( 18 ).…”

Section: Discussionmentioning

confidence: 99%

Balance ability and all-cause death in middle-aged and older adults: A prospective cohort study

Xie

Han²,

Hu³

2023

Front. Public Health

View full text Add to dashboard Cite

ObjectiveThe present study aimed to explore the relationship between balance ability and all-cause death in middle-aged and elderly people and to provide a basis for formulating a balanced training plan for middle-aged and older people in China.MethodsBased on data from the China Health and Retirement Longitudinal Study (CHARLS) carried out in the years 2011, 2013, 2015, and 2018, 18,888 participants aged 45 years and above were included. Cox proportional hazard models were designed to evaluate the effect of balance ability on death events.ResultsThe present study found that there was an association between balance ability and death among middle-aged and older people. Multivariate Cox proportional hazard regression model analysis showed that the risk of death decreased by 10% (HR = 0.90,95% CI: 0.85–0.95) for every second increase in balance ability. With balance ability <10 s as the reference group, the adjusted HRs were 0.61 (0.44–0.85) among middle-aged and elderly people. The death density of balance ability of <10 s was 73.87 per thousand person-years higher than that of ≥10 s. There was no interaction between balance ability and chronic disease, overweight, and obesity (P > 0.05).ConclusionThe risk of all-cause death in middle-aged and older people increased with the decrease in balance ability and showed no statistical significance between chronic disease, overweight, and obesity, as corroborated by the present study.

show abstract

“…This means that some sensory modalities can contribute more to the representation of balance and posture, being weighted heavier, while others contribute less. These weights are typically not equal between modalities (1)(2)(3)(4), and the CNS appears able to change these weights (termed 'reweighting'), depending on the task or environmental conditions (5)(6)(7)(8)(9).…”

Section: Introductionmentioning

confidence: 99%

Dynamics of sensorimotor reweighting: How light touch alters vestibular-evoked balance responses

Goar,

Barnett-Cowan,

Horslen

2024

Preprint

View full text Add to dashboard Cite

Integrated multisensory feedback plays a crucial role in balance control. Minimal fingertip contact with a surface (light-touch), reduces centre of pressure (CoP) by adding sensory information about postural orientation and balance state. Electrical vestibular stimulation (EVS) significantly increases sway by adding erroneous vestibular cues. This juxtaposition of conflicting sensory cues can be exploited to explore the dynamics of sensorimotor reweighting. We used continuous stochastic EVS (0-25Hz; ± 4mA; 200-300s) to evoke balance responses in CoP (Exp-1, Exp-2) and segment accelerations (Exp-2). Systems analyses (coherence, gain) quantified coupling and size of balance responses to EVS. We had participants either touch (TOUCH; <2N) or not touch (NO-TOUCH) a load cell during EVS (Exp-1, Exp-2), or we intermittently removed the touch surface (Exp-2) to measure the effects of light touch on vestibular-evoked balance responses. We hypothesized that coherence and gain between EVS and CoP would decrease, consistent with the CNS down-weighting vestibular cues that conflict with light touch. Light touch reduced CoP displacement, but increased variation in the CoP signal explained by EVS input. Significant coherence between EVS and CoP was observed up to ~30Hz in both conditions but was significantly greater in the TOUCH condition from 12-28.5-Hz. Conversely, EVS-CoP gain was 63% lower in TOUCH, compared to NO-TOUCH. Our findings show that light touch can re-weight vestibular-evoked responses by reducing their size but also increasing high frequency vestibular contributions for sway. This suggests that the CNS can use novel sensory inputs to alter balance behavior but cannot completely ignore a salient balance cue.

show abstract

Learning to stand with unexpected sensorimotor delays

Cited by 14 publications

References 89 publications

Unperceived motor actions of the balance system interfere with the causal attribution of self-motion

Unperceived motor actions of the balance system interfere with the causal attribution of self-motion

Balance ability and all-cause death in middle-aged and older adults: A prospective cohort study

Dynamics of sensorimotor reweighting: How light touch alters vestibular-evoked balance responses

Contact Info

Product

Resources

About