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Neuroscience› Cognitive Neuroscience› Tactile and Sensory Interactions

Neural engineering and somatosensory prosthetics — Direct cortical stimulation of primary somatosensory cortex as prosthetic feedback

Submitted 2026-10-22

Field: Neuroscience › Cognitive NeuroscienceType: A method hit a wallArea: neural engineering and somatosensory prostheticsTarget: Direct cortical stimulation of primary somatosensory cortex as prosthetic feedbackStage: full study

Hypothesis

Stimulating somatosensory cortex can stand in for touch in a neuroprosthesis, giving feedback as usable and as fast as a cutaneous haptic cue.

What failed

In four subjects implanted with electrocorticographic grids, median response times to reliably perceived cortical stimulation ran from 254 ms to 528 ms against 198-313 ms for haptic stimuli to the hand, a significant slowing; no learning or habituation appeared across blocks and stimulation train duration did not change the latency.

Broken assumption

Cortical stimulation is perceived as quickly as peripheral touch, so it can be substituted for it in a feedback loop.

Why

The authors offer no mechanism, presenting the latencies as a realistic expectation for prosthetic feedback and calling for study of how cortical stimulation is perceived.

From the published paper: Caldwell et al. Scientific Reports, 2019. ↗CC BY

Research ideas from this failure

Unvetted lead — read the papers

New hypotheses this failure suggests, each with a crucial experiment, a rival explanation of the original result, and the papers it rests on. Written by AI from paper titles and abstracts found on OpenAlex (and Europe PMC, for life and health sciences).

Related failures

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Links in published research

Where this experiment's genes are known to matter outside its own research area, and the papers behind those links. Sources: Open Targets Platform and Europe PMC.