Although serious interest in studying the role of central cho linergic processes in psychopathology is just beginning to emerge, experimental literature on the part played by cholinergic mechanisms in brain behavior. reiations is quite extensive. During the past thirty years, cholinergic research has contributed significantly to the characterization and differentiation of adaptive mechanisms in volved in input selection, perception, cortical, autonomic and behav ioral activation, learning, memory, and inhibitory control of behav ioral outputs. To say that dysfunction of one or more of these...