498. Relationship Between Electroencephalography-Based Mismatch Negativity and Antipsychotic Treatment Response in Young People at Clinical High Risk for Psychosis - De Rozario, Magdelene; Rowe, Elise; Haaf, Moritz; Adams, Julia; Dzafic, Ilvana; Garrido, Marta; Leicht, Gregor; Wood, Stephen (Biological psychiatry (1969), 2025)