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was one of the individuals to lay the foundation for later research of intelligence. He thought that intelligence was a function of "efficiency of the nervous
System" and therefore tried to measure intelligence with tests that, for example, assessed reaction and sensory acuity.
LSD
Lysergic acid diethylamide, a powerful hallucinogenic drug that alters perception, thoughts, and feelings.
Hallucinations
Perceptions in a conscious and awake state in the absence of external stimuli that have qualities of real perception.
Pain-killing Neurotransmitters
Chemical substances in the nervous system that reduce the sensation of pain, such as endorphins.
Foot Shocks
Unpleasant electric shocks applied to the feet, often used in behavioral experiments to study learning and conditioning.
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