Decoding Pain-Specific Oscillations in Deep Brain Structures with a Flexible Multi-Channel Bioelectronic Interface for Precision Neuromodulation

We introduce a multi-channel PEDOT:PSS-coated flexible micro-electrode array capable of stable, highresolution recordings from the mouse ventral tegmental area (VTA) for months. Using this chronic deep-brain interface, we identified three functionally distinct nociceptive-responsive neuronal subpopulations (excitatory, inhibitory, non-responsive) and revealed stimulus-locked augmentation of$\beta(15-30 ~\text{Hz})$and low-$\gamma (30-60 ~\text{Hz})$oscillations. These findings establish VTA as a previously unrecognized pain-processing node and provide candidate electrophysiological biomarkers for pain states. The technology platform opens new avenues for circuitlevel, low-addiction analgesic strategies.