Examlex
Petroleum is a fossil fuel containing many different carbon compounds. If the carbon atoms in petroleum have been in the ground for 100 million years, what fraction of the initial 14C atoms is still there? (t1/2 = 5730 yr)
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.
Extinction
In psychology, the gradual weakening of a conditioned response when the reinforcement is no longer provided.
Stimulus Generalization
A psychological phenomenon in which a response that has been conditioned for one stimulus is evoked by another, similar stimulus.
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