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Inspired by honeybees that locally heat beeswax to reversibly switch it between rigid and moldable states for comb construction, this work introduces a heat\u2010induced viscoelasticity\u2010switchable electrode (HIVE) that enables conformal contact on hairy scalps and user\u2010friendly operation in wearable systems. HIVE integrates a thermoresponsive gelatin gel confined in a sponge matrix with an on\u2010electrode microheater. Its temperature is actively modulated on demand, enabling autonomous switching between the gel and sol states. As a flowable sol, it permeates hair, conforms to the skin. At body temperature, it remains in a viscoelastic state, providing strong adhesion. Moreover, heating duration is closed\u2010loop controlled using real\u2010time electrode\u2010skin impedance. In steady\u2010state visual evoked potential paradigm, HIVE delivers high classification accuracy comparable to gold\u2010standard wet electrodes while supporting wearable BCI devices for vision\u2010based wheelchair navigation and high\u2010speed text entry. By translating honeybee viscoelasticity\u2010modulation strategy into bioelectronic interfaces, this work provides a practical solution for wearable BCI devices and a new design paradigm for conformal biointerfaces on hairy or piliferous surfaces.<\/jats:p>","DOI":"10.1002\/adma.202517936","type":"journal-article","created":{"date-parts":[[2025,12,29]],"date-time":"2025-12-29T07:43:48Z","timestamp":1766994228000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["Bioinspired Heat\u2010Induced Viscoelasticity\u2010Switchable Electrodes for Conformal Brain\u2010Computer Interfaces"],"prefix":"10.1002","volume":"38","author":[{"given":"Zheren","family":"Cai","sequence":"first","affiliation":[{"name":"Innovative Centre For Flexible Devices (iFLEX) Max Planck\u2013NTU Joint Lab for Artificial Senses School of Materials Science and Engineering Nanyang Technological University  Singapore Singapore"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shangen","family":"Zhang","sequence":"additional","affiliation":[{"name":"College of Computing and Data Science Nanyang Technological University  Singapore Singapore"},{"name":"School of Computer and Communication Engineering University of Science and Technology Beijing  Beijing P. 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