BCIwiki (bciwiki.com) — A conductive hydrogel electrode with hierarchical anisotropic structures captured signals comparable in quality to the wet and dry electrode benchmarks commonly used in non-invasive brain-computer interfaces (BCIs), in preliminary P300 and steady-state visual evoked potential (SSVEP) experiments. The work was reported in Smart Materials and Structures on September 11, 2026, by Lina Qi, Qingyang Deng, Junqi Chen, Yanrong Li, Yuhao Zu and Jianan Wang.
According to the abstract, the material is made through an in situ directionally frozen copolymerization approach that yields a dual-scale architecture: aligned vertical microchannels for ion transport and an interconnected nanoporous network for enhanced electronic conduction. The paper says this hierarchical design delivers higher conductivity than conventional hydrogel electrodes.
On mechanical performance, the paper reports a tissue-matched compressive modulus, high extensibility, strong skin adhesion and rapid self-healing. The abstract also notes that achieving high conductivity, mechanical compliance and long-term durability at the same time remains a challenge for flexible hydrogel electrodes.
The P300 and SSVEP experiments are presented as a feasibility demonstration. The paper reports no long-term wear stability data, no scalable manufacturing process and no human clinical trial results.