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.We do not recommend that you commit these principles to memory, because individually they represent an artificial analysis of the situation.There is a single statement that embodies all of these principles:BRAIN CHEMISTRY, BEHAVIOR AND THE ENVIRONMENTHAVE INTERPENETRATING EFFECTS.This statement is the major theme of the book, and emphasizes the need to appreciate the complexities of the nervous system.Yes, drugs change behavior.But the effect of a drug can be altered by the organism's behavior, which in turn has been produced by current and past changes in the environment.Drugs do not possess some essence that magically induces a change in behavior.They act through the normal channels of our physiological response to the environment.As human organisms in a complex environment, we are fortunate that these interactions are complicated.As students of behavior, these physiological interactions are pushed to their limits in our feeble attempts to understand them.Do not despair; the thrill is in the pursuit.E.SUMMARYPrinciples1.The brain is the organ of behavior.2.Brain functions are controlled by unique interactions between neurotransmitter chemicals and specific receptor sites.3.Ancient folk medicine and modern pharmacology are both based upon these principles of chemical specificity.4.The sympathetic and parasympathetic divisions of the autonomic nervous system have served as models for understanding the more complex systems of chemical coding in the brain.5.Brain chemistry, behavior and the environment have interpenetrating effects
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