vii Drugs and sex are two topics about which most people have strong
opinions and weak understanding. Knowledge of each can be gained in many
ways, all with associated rewards and risks. Like all textbooks, this
one was written in the belief that reading can foster learning. The book
is intended to introduce principles of behavioral pharmacology to
readers with little or no knowledge of the discipline but with an
interest in how drugs affect human behavior. Gleaning anything of value
from the text requires two things from the reader. The first is a
willingness to accept an analysis of drug effects that shares little
with folklore or common sense no- tions of drug action. The second is a
willingness to accept the fact that the behavioral effects of drugs are
complex and depend upon a sizable number of pharmacological and
behavioral variables. Unless one is aware of these factors and how they
determine a drug's actions, the behavioral effects of drugs can be
neither pre- dicted nor meaningfully explained. If it does nothing else,
this volume will make it obvious that the behavioral effects of drugs
are lawful and can be predicted and understood on the basis of
well-established relations between empirical phenomena. De- scribing
these relations and exploring how they allow behavioral ix x PREFACE
pharmacologists to make sense of drug effects that are otherwise
incomprehensible was a major goal in preparing the text.