Central Nervous System, Conditioning, Classical, Action Potentials, Synaptic Transmission, Thalamus, Adrenal Glands, Neural Pathways, Limbic System, Homeostasis, Attention, Skin, Cerebrospinal Fluid, Motor Neurons, Muscles, Brain, Electroencephalography, Amygdala, Pain, Intractable, Frontal Lobe, Electrophysiology, Spinal Cord, Blood-Brain Barrier, Neuroglia, Body Temperature Regulation, Models, Neurological, Hypothalamus, Sensation, Neurophysiology, Motor Activity, Language Development, Feedback, Dogs, Reflex, Aphasia, Animals, Humans, Neurons, Afferent, Dominance, Cerebral, Agraphia, Body Weight, Cell Membrane, Neural Inhibition, Axons, Acetylcholine, Psychosurgery, Synapses, Cats, Conditioning, Operant, Perception, Sleep, Digestive System, Brain Stem