Sensory attenuation from action observation

Scott, Mark

doi:10.1007/s00221-022-06460-1

Cited by 1 publication

(1 citation statement)

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“…Perceived force, touch or pain has been shown to be influenced by movement preparation, execution or even observation ( Loehr, 2013 ; Palmer et al, 2016 ; Pinto et al, 2021 ; Scott, 2022 ). SEP amplitudes are reduced during concurrent tactile stimulation ( Kakigi and Jones, 1985 , 1986 ), passive ( Abbruzzese et al, 1981 ; Rushton et al, 1981 ) and voluntary movement ( Papakostopoulos et al, 1975 ; Rushton et al, 1981 ; Cheron and Borenstein, 1987 ) of the stimulated body part compared to SEPs elicited at rest.…”

Section: Discussionmentioning

confidence: 99%

Movement predictability modulates sensorimotor processing

Altermatt,

Thomas,

Wenderoth

2023

Front. Hum. Neurosci.

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IntroductionAn important factor for optimal sensorimotor control is how well we are able to predict sensory feedback from internal and external sources during movement. If predictability decreases due to external disturbances, the brain is able to adjust muscle activation and the filtering of incoming sensory inputs. However, little is known about sensorimotor adjustments when predictability is increased by availability of additional internal feedback. In the present study we investigated how modifications of internal and external sensory feedback influence the control of muscle activation and gating of sensory input.MethodsCo-activation of forearm muscles, somatosensory evoked potentials (SEP) and short afferent inhibition (SAI) were assessed during three object manipulation tasks designed to differ in the predictability of sensory feedback. These included manipulation of a shared object with both hands (predictable coupling), manipulation of two independent objects without (uncoupled) and with external interference on one of the objects (unpredictable coupling).ResultsWe found a task-specific reduction in co-activation during the predictable coupling compared to the other tasks. Less sensory gating, reflected in larger subcortical SEP amplitudes, was observed in the unpredictable coupling task. SAI behavior was closely linked to the subcortical SEP component indicating an important function of subcortical sites in predictability related SEP gating and their direct influence on M1 inhibition.DiscussionTogether, these findings suggest that the unpredictable coupling task cannot only rely on predictive forward control and is compensated by enhancing co-activation and increasing the saliency for external stimuli by reducing sensory gating at subcortical level. This behavior might serve as a preparatory step to compensate for external disturbances and to enhance processing and integration of all incoming external stimuli to update the current sensorimotor state. In contrast, predictive forward control is accurate in the predictable coupling task due to the integrated sensory feedback from both hands where sensorimotor resources are economized by reducing muscular co-activation and increasing sensory gating.

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