ArticleScientific reports2025
Quantitative assessment of human-exoskeleton integration through a neurophysiological marker of embodiment.
Article in Scientific reports, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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10 authors.
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Abstract
Assistive exoskeletons are increasingly used in rehabilitation settings, yet their adoption in real-world scenarios remains limited. This is partly due to the insufficient understanding of human-device interaction mechanisms. The process through which the central nervous system integrates external devices is known as "tool embodiment" and is primarily assessed through subjective questionnaires. This protocol aims to identify a quantitative marker of embodiment by leveraging the phenomenon of sensory attenuation, i.e., the modulation of sensory stimulation intensity perception as a function of action control. Twenty-one participants either self-administered electrical stimulation to the median nerve by stepping on a pedal or remained still during stimulation by the experimenter, in two conditions: with and without wearing a lower-limb exoskeleton. Somatosensory evoked potentials (SSEPs) were recorded using a 64-channel electroencephalography. Results showed reduced N60 amplitude during self-stimulation, consistent with sensory attenuation, in both conditions. However, wearing the exoskeleton led to higher N60 amplitudes, suggesting reduced motor prediction accuracy. External stimulation elicited a larger N100 component, likely reflecting increased attentional engagement. Together, N60 and N100 serve as promising neurophysiological indices of embodiment and cognitive load. These objective markers could be integrated into the design and evaluation of robotic devices, improving usability and fostering better device-user integration.
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