BCIwiki (bciwiki.com) — Purdue University researchers found that stimulating more electrodes simultaneously helped eight mice learn artificial sensory signals faster and navigate more effectively. The study was uploaded to bioRxiv on September 23, 2026 and has not been peer reviewed.
Intracortical microstimulation directly modulates cortical activity. Only some reported sensations concern body position and movement, so the researchers trained animals to associate artificial stimulation with spatial locations.
Mice located a target in a training cage using a red visual circle, multichannel electrical stimulation, or both. Sparse encoding stimulated fewer electrodes simultaneously; redundant encoding stimulated more.
Redundant encoding accelerated learning. With stimulation alone, mice ran faster and completed trials sooner. Combined with vision, it improved success rates, path efficiency, movement speed and movement time. The authors suggest that optimized encoding could help artificial sensation integrate with existing sensorimotor circuits; transfer to humans remains to be tested.