Artificial vibrotactile feedback elicits neural correlates of sense of agency.

The study included only twenty-five healthy adults, so it says nothing about patients with sensory loss, amputation, or prosthetic use. The test was a short laboratory stepping task, not long-term use of a real assistive device. Auditory and vibrotactile stimulus intensities were not matched, so differences between the two feedback types are hard to interpret. The self-reported control ratings and timing estimates did not support agency, so the brain finding alone is not evidence of felt control. The vibrotactile N100 change was opposite to the auditory N100 change, and the authors say the directionality is unclear. The subgroup analysis of explicit agency ratings was exploratory and based on small groups. The study did not compare the auditory and vibrotactile modalities directly, because the stimuli were considered different.

Do not read this as evidence that vibrotactile feedback makes patients feel more control. The self-reported control ratings did not rise above the neutral rating, and the study was done in healthy adults in a lab task.