Continuous sliding pressure feedback enhances supernumerary robotic thumb proprioception over discrete vibrotactile feedback: behavioral and EEG evidence.

Continuous pressure cues supported more accurate position judgments than discrete vibration cues in this laboratory task. This was a human-augmentation experiment, not a rehabilitation or clinical-outcome trial.

Alsuradi H, Korres G, Ko P, Hong J, Eid M.
Journal of neural engineering · Publication date: 2026-09-21
Added to site: 2026-09-25
DOI: 10.1088/1741-2552/aea36f

Electronic publication date verified in Europe PMC. The record was first indexed 2026-09-09 before final electronic publication. This source date is separate from the site's addition date.

Modalities

Sensory biofeedback, EEG, Assistive robotics

Clinical focus

Proprioception, Human augmentation, Sensorimotor integration

Population

Adults completing a passive robotic-thumb position-decoding task without vision

Sample

42 participants assigned to continuous sliding-pressure or discrete vibrotactile feedback

Intervention / method

Participants received modality-specific sensory feedback during passive supernumerary robotic-thumb movements and identified start and end positions

Comparator

Continuous sliding-pressure feedback versus discrete vibrotactile feedback, with implicit feedback as an additional behavioral reference

Clinician summary

Both explicit feedback modes outperformed implicit feedback. Pressure feedback was more accurate and showed higher beta-band network small-worldness; vibrotactile feedback produced more sustained alpha and beta desynchronization, interpreted as greater processing demand.

How to interpret the findings

Laboratory task with passive movement, no vision and no clinical population or long-term use. The checked abstract does not report subgroup sizes, assignment method, effect sizes, adverse events, funding or conflicts. EEG differences do not independently establish easier cognitive integration or real-world benefit.

Equipment and disclosures

Supernumerary robotic thumb with sliding-pressure and vibrotactile feedback systems; model and vendor details were unavailable in the checked abstract.

Funding and competing-interest details were not available in the checked indexed record.

Related evidence

Compare findings from the same clinical area, including mixed results.