A brain-computer interface that delivers artificial sensory information to the brain via electrical stimulation, restoring or creating sensations of touch, vision, hearing, or proprioception.

What category does Sensory BCI belong to in BCI?

Sensory BCI is a Applications concept in brain-computer interface science.

Sensory BCI — BCI Glossary

A sensory BCI is a neural interface that writes information into the brain — delivering electrical stimulation to sensory cortical areas to evoke perceptions that the user experiences as touch, pressure, vision, or other sensations. Sensory BCIs address the "write" side of the bidirectional BCI equation, complementing motor BCIs that handle the "read" side.

Somatosensory (Touch) BCIs

The most advanced sensory BCI work targets somatosensory cortex to restore tactile feedback for prosthetic limb users:

Intracortical microstimulation (ICMS): Electrodes implanted in somatosensory cortex (S1) deliver small electrical currents that evoke sensations perceived as originating from specific body locations. Stimulation parameters (frequency, amplitude, pulse width) can encode different qualities of touch — pressure, vibration, texture.
Clinical demonstrations: The University of Pittsburgh group (Gaunt, Collinger, Bensmaia) has shown that participants with tetraplegia can discriminate textures, detect object contact, and regulate grasp force using ICMS-based feedback through Utah Arrays implanted in S1.

Visual Prostheses

Visual BCIs (cortical visual prostheses) stimulate visual cortex to evoke phosphenes — points of light — in the visual field of blind individuals. The Orion device (Second Sight, now discontinued) and the Gennaris system (Monash University) represent attempts to create cortical vision prostheses. The challenge is producing coherent visual percepts from a limited number of stimulation electrodes.

Cochlear Implants

The cochlear implant is the most successful sensory neural interface in history, with over 1 million implanted worldwide. While technically a peripheral (not cortical) device, it demonstrates that electrical stimulation of sensory neural pathways can produce rich, useful perceptual experiences — a key proof of concept for cortical sensory BCIs.

Challenges

Sensory BCIs face fundamental challenges: understanding how the brain naturally encodes sensory information (encoding models), designing stimulation patterns that produce naturalistic perceptions rather than artificial buzzing or tingling, avoiding tissue damage from chronic stimulation, and managing stimulation artifacts that interfere with simultaneous neural recording in bidirectional systems.