Current Status of the Basal Forebrain Cholinergic System: A Preview and Commentary.- The Basal Forebrain Cholinergic System: An Evolving Concept in the Neurobiology of the Forebrain.- Behavioral Neuroanatomy of Cholinergic Innervation in the Primate Cerebral Cortex.- Input/Output Relations of the Magnocellular Nuclei of the Basal Forebrain.- Role of the Basal Forebrain Cholinergic System in Cortical Activation and Arousal.- Functional Implications of Tonic and Phasic Activity Changes in Nucleus Basalis Neurons.- Actions of Acetylcholine on Cortical Neurons: Pieces in the Puzzle About Mechanisms Underlying Learning.- Acetylcholine Modulation of Cellular Excitability Via Muscarinic Receptors: Functional Plasticity in Auditory Cortex.- Basal Forebrain, Memory and Attention.- An Analysis of the Basal Forebrain Contribution to Learning and Memory.- Ocular Dominance Plasticity in Kitten Visual Cortex: Integration of Noradrenergic and Cholinergic Regulation.- Cholinergic Modulation of Synaptic Plasticity in Sensory Neocortex.- The Cholinergic Basal Forebrain as a Cognitive Machine.