Noninvasive profiling of input-output excitability curves in human prefrontal cortex bioRxiv : the preprint server for biology | 3 October, 2025 Nai-Feng Chen, Umair Hassan, Jessica M Ross, Lily Forman, James W Hartford, Juha Gogulski, Sara Parmigiani, Jade Truong, Corey J Keller, Christopher C Cline