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Measuring the nonselective effects of motor inhibition using isometric force recordings

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Abstract

Inhibition is a key cognitive control mechanism humans use to enable goal-directed behavior. When rapidly exerted, inhibitory control has broad, nonselective motor effects, typically demonstrated using corticospinal excitability measurements (CSE) elicited by transcranial magnetic stimulation (TMS). For example, during rapid action-stopping, CSE is suppressed at both stopped and task-unrelated muscles. While such TMS-based CSE measurements have provided crucial insights into the fronto-basal ganglia circuitry underlying inhibitory control, they have several downsides. TMS is contraindicated in many populations (e.g., epilepsy or deep-brain stimulation patients), has limited temporal resolution, produces distracting auditory and haptic stimulation, is difficult to combine with other imaging methods, and necessitates expensive, immobile equipment. Here, we attempted to measure the nonselective motor effects of inhibitory control using a method unaffected by these shortcomings. Thirty male and female human participants exerted isometric force on a high-precision handheld force transducer while performing a foot-response stop-signal task. Indeed, when foot movements were successfully stopped, force output at the task-irrelevant hand was suppressed as well. Moreover, this nonselective reduction of isometric force was highly correlated with stop-signal performance and showed frequency dynamics similar to established inhibitory signatures typically found in neural and muscle recordings. Together, these findings demonstrate that isometric force recordings can reliably capture the nonselective effects of motor inhibition, opening the door to many applications that are hard or impossible to realize with TMS.

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Acknowledgements

This work was funded by the National Science Foundation (NSF CAREER 1752355 to JRW). GN acknowledges support from the European Research Council (grant agreement 948186).

The data and materials reported here are available on the Open Science Framework ( https://osf.io/en8t9/ ) This experiment was not preregistered.

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National Science Foundation (NSF CAREER 1752355 to JRW).

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Correspondence to Benjamin O. Rangel.

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University of Iowa (IRB #201511709).

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Significance statement

Inhibitory control allows humans to override inappropriate actions during goal-directed behavior. When inhibition is rapidly exerted on the motor system, it has broad, nonselective effects. For example, when a foot movement is rapidly stopped, other task-unrelated muscles also show signs of inhibition. This is typically shown using transcranial magnetic stimulation (TMS) of the motor cortex. However, TMS is contraindicated in many populations of interest, produces artifacts in neural recordings, is distracting to the subject, and has very limited time resolution. Here, we demonstrate clear nonselective effects of inhibitory control using isometric force recordings from a task-unrelated muscle during a stop-signal task. This simple method has high time resolution, no contraindications, and could be readily combined with other imaging methods.

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Rangel, B.O., Novembre, G. & Wessel, J.R. Measuring the nonselective effects of motor inhibition using isometric force recordings. Behav Res (2023). https://doi.org/10.3758/s13428-023-02197-z

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  • DOI: https://doi.org/10.3758/s13428-023-02197-z

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