6 ch4 - I. Altering Consciousness with Drugs A....

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I. Altering Consciousness with Drugs A. psychoactive drugs: chemical substances that act on the nervous system to alter consciousness, modify perceptions, and change moods B. tolerance: progressive decrease in person's responsiveness to drug due to continued use C. withdrawal: discomfort and distress from stopping an addictive drug i. symptoms typically opposite of pleasurable sensations caused by drug D. physical dependence: physiological need for a drug, experiences withdrawal symptoms E. psychological dependence: a psychological need to use a drug, no withdrawal F. drug addiction: physical and/or psychological dependence on a drug II. types of psychoactive drugs A. depressants: drugs that decreases nervous system activity i. ii. @ high doses can slow nervous system to point of death B. Alcohol i. 2 nd most commonly used recreational drug in US ii. causes relaxed pleasant state, increases self-esteem iii. brain activity decreased: a) lowers inhibitions b) impairs judgment/cognition c) slow reaction times, impairs motor abilities
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6 ch4 - I. Altering Consciousness with Drugs A....

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