Modulation of vestibular-evoked responses prior to simple and complex arm movements
- 11 March 2020
- journal article
- research article
- Published by Springer Science and Business Media LLC in Experimental Brain Research
- Vol. 238 (4), 869-881
- https://doi.org/10.1007/s00221-020-05760-8
Abstract
During destabilizing, voluntary arm movements, the vestibular system provides sensory cues related to head motion that are necessary to preserve upright balance. Although sensorimotor processing increases in accordance with task complexity during the preparation phase of reaching, it is unclear whether vestibular signals are also enhanced when maintaining postural control prior to the execution of a voluntary movement. To probe whether vestibular cues are a component of complexity-related increases in sensorimotor processing during movement preparation, vestibular-evoked responses to stochastic (0–25 Hz; root mean square = 1 mA) binaural, bipolar electrical vestibular stimulation (EVS) were examined. These responses were assessed using cumulant density function estimates in the upper and lower limbs prior to ballistic arm movements of varying complexity in both standing (experiment 1) and seated (experiment 2) conditions. In experiment 1, EVS-electromyography (EMG) cumulant density estimates surpassed 95% confidence intervals for biceps and triceps brachii, as well as the left and right medial gastrocnemius. For the latter two muscles, the responses were enhanced 10–18% with increased movement complexity. In experiment 2, the EVS-EMG cumulant density estimates also surpassed 95% confidence intervals in the upper limb, confirming the presence of vestibular-evoked responses while seated; however, the amplitude was significantly less than standing. This study demonstrates the vestibular system contributes to postural stability during the preparation phase of reaching. As such, vestibular-driven signals may be used to update an internal model for upcoming reaching tasks or to prepare for imminent postural disturbances.Funding Information
- Natural Sciences and Engineering Research Council of Canada (2017-06632)
- Canada Foundation for Innovation (30979)
This publication has 56 references indexed in Scilit:
- Testing the excitability of human motoneuronsFrontiers in Human Neuroscience, 2013
- Human standing is modified by an unconscious integration of congruent sensory and motor signalsJournal Of Physiology-London, 2012
- The vestibular system: multimodal integration and encoding of self-motion for motor controlTrends in Neurosciences, 2012
- Frequency-Specific Modulation of Vestibular-Evoked Sway Responses in HumansJournal of Neurophysiology, 2010
- Determining the direction of vestibular‐evoked balance responses using stochastic vestibular stimulationJournal Of Physiology-London, 2009
- Frequency response of human vestibular reflexes characterized by stochastic stimuliJournal Of Physiology-London, 2007
- Feedforward versus feedback modulation of human vestibular‐evoked balance responses by visual self‐motion informationJournal Of Physiology-London, 2007
- Spatial Transformations for Eye–Hand CoordinationJournal of Neurophysiology, 2004
- Effects of transmastoid electrical stimulation on the triceps brachii EMG in manNeuroReport, 1990
- Vestibulospinal and Reticulospinal SystemsPublished by American Geophysical Union (AGU) ,1981