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Term Definition
implicit memoryThe memories acquired through unconscious learning processes, such as operant and classical conditioning.

inhalantsAny drug administered by breathing in its vapors. Most inhalants are organic solvents such as glue and paint thinner, or anesthetic gases such as ether and nitrous oxide.

inhibitory neurotransmitterA neurotransmitter that acts to prevent a neuron from firing an action potential.

inpatient treatmentResidential treatment for drug addiction in a hospital or clinic.

interneuronAny neuron that only sends its messages locally (within a millimeter or so). Many are inhibitory.

interventionThe act of interrupting addiction and persuading the addict to enter treatment.

intervention counselorA person who conducts an intervention with an addict and the addict's family and close friends.

intoxicationBeing under the influence of, and responding to, the acute effects of a psychoactive drug. Intoxication typically includes feelings of pleasure, altered emotional responsiveness, altered perception, and impaired judgment and performance.

Special Thanks:
Addiction Studies Program - Wake Forest University School of Medicine
False Messengers: How Addictive Drugs Change the Brain by David Friedman, PhD, and Sue Rusche, Harwood Academic Publishers, Amsterdam, The Netherlands, 1999. [www.addictionstudies.org]