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Scarcity is a problem faced by all but the wealthiest of citizens.
Conditioned Response
A learned reaction or behavior to a previously neutral stimulus that has become associated with a significant stimulus.
Novel Stimulus
A new or unfamiliar stimulus that has not been previously experienced by an organism, often used in experimental research to gauge response or attention.
Stimulant
A substance that increases physiological or nervous activity in the body.
Stimulus Discrimination
The ability to distinguish between different stimuli, even if they are similar, based on learned responses.
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