This grant provides funding to organize and execute the 2026 National Science Foundation Mind, Machine, and Motor Nexus (M3X) Principal Investigators' Meeting. This meeting will convene investigators of active NSF M3X Program awards for the first time since the program began in 2019. This meeting serves as a conference bringing together a community of interdisciplinary researchers whose work is specifically relevant to advancing seamless bi-directional interaction between intelligent engineered systems and humans. The two-day event will feature poster sessions, M3X program updates, keynote addresses, and interactive panel discussions, creating a rich environment for knowledge exchange and the identification of new research avenues. This meeting will also support participation by a cohort of potential future researchers in the M3X program. The inaugural M3X Principal Investigator meeting will take place at NSF headquarters. This event will gather researchers from a wide array of fields, including but not limited to robotics, cognitive neuroscience, human factors, and artificial intelligence, to showcase innovative projects and prioritize collaboration. Through workshops, discussions, and networking opportunities, attendees will collectively explore how these interactions could revolutionize various industries, from healthcare to transportation. From a scientific perspective, the M3X meeting represents a pivotal convergence of disciplines that address the complexities of bi