Shanghai StairMed Technology Co.’s brain-computer interface device that can pick up neural signals.Photographer: Qilai Shen/BloombergSeptember 18, 2025 at 11:00 PM UTCUpdated on September 19, 2025 at 6:09 AM UTCAmerica’s leadership in the cutting-edge field of brain technology is being challenged as Chinese startups rise with the support of a full-throttle policy drive.For years, US companies like Elon Musk’s Neuralink Corp. have led the industry with state-of-the-art procedures implanting chips...