Chapter 10 Achievement motive The need to master difficult challenges, to outperform others, and to meet high standards of excellence. Androgens The principal class of gonadal hormones in males. Argument One or more premises used to provide support for a conclusion. Assumptions Premises for which no proof or evidence is offered. Bisexuals Persons who seek emotional-sexual relationships with members of either sex. Body mass index (BMI) Weight (in kilograms) divided by height (in meters) squared (kg/m2). Display rules Cultural norms that regulate the appropriate expressions of emotions. Drive An internal state of tension that motivates an organism to engage in activities that should reduce the tension. Emotion A subjective conscious experience (the cognitive component) accompanied by bodily arousal (the physiological component) and by characteristic overt expressions (the behavioral component). Estrogens The principal class of gonadal hormones in females. Galvanic skin An increase in the electrical conductivity of the skin that occurs when sweat glands increase their response (GSR) activity. Glucose A simple sugar that is an important source of energy. Glucostats Neurons sensitive to glucose in the surrounding fluid. Hedonic adaptation An effect that occurs when the mental scale that people use to judge the pleasantnessunpleasantness of their experiences shifts so that their neutral point, or baseline for comparison, changes. Heterosexuals Persons who seek emotional-sexual relationships with members of the other sex. Homeostatsis A state of physiological equilibrium or stability. Homosexuals Persons who seek emotional-sexual relationships with members of the same sex. Incentive An external goal that has the capacity to motivate behaivor. Lie detector See Polygraph. Motivation Goal-directed behavior. Obesity The condition of being overweight. Parental investment What each sex invests—in terms of time, energy, survival risk, and forgone opportunities—to produce and nurture offspring. Polygraph A device that records autonomic fluctuations while a subject is questioned, in an effort to determine whether the subject is telling the truth. Premises The reasons presented to persuade someone that a conclusion is true or probably true. Refractory period A time following orgasm during which males are largely unresponsive to further stimulation. Set-point theory The idea that the body monitors fat-cell levels to keep them (and weight) fairly stable). Settling-point theory The idea that weight tends to drift around a level at which the constellation of factors that determine food consumption and energy expenditure achieve an equilibrium. Sexual orientation A person’s preference for emotional and sexual relationships with individuals of the same sex, the other sex, or either sex. Subjective wellIndividuals’ perceptions of their overall happiness and life satisfaction. being Vasocongestion Engorgement of blood vessels.