Article Exposure therapy Extinction learning GABAergic transmission Neuroscience PTSD Prolonged exposure Psychotherapy amygdala brain function brexanolone clinical effectiveness connectome cycloserine default mode network dorsolateral prefrontal cortex down regulation emotionality functional connectivity functional magnetic resonance imaging hippocampus human midomafetamine mindfulness neurobiology neuromodulation neuroscience oxytocin posttraumatic stress disorder prasterone