Our overall hypothesis is that 10 Hertz rTMS of the left dorsolateral prefrontal cortex (DLPFC) will correct impulsive choice behavior deficits found in acutely suicidal patients that in turn will translate into faster resolution of acute suicidal ideation. The current proposal will expand our understanding of the neurobiology of suicidal behavior by examining a potential neurocognitive mechanism of acute suicidality and test the value of rTMS as intervention for acute suicidal behavior. The current proposal will utilize behavioral assessments and rTMS in a randomized controlled trial in a group of adult patients hospitalized: a) following a recent suicide attempt with persistent suicidal ideation, or b) for severe suicidal ideation (n=20). Specifically, we propose: