254. Exploring the Effects of Electroconvulsive Therapy Using Dense Sampling Neuroimaging: Differentiating the Impact of Seizure and Electricity. - Argyelan, Miklos; Baradits, Mate; Davani, Ashkhan; Spitzberg, Andy; Joanlanne, Andrea; Arcaro, Noelle; Azizi, Heela; Sanghani, Sohag; Malhotra, Anil (Biological Psychiatry, 2025)