Examlex
Which of the following does not have at least one, very long-lived, natural, radioactive isotope?
Acquisition
The process of learning or obtaining something, such as skills, knowledge, or possessions.
Extinction
The process in which a conditioned response gradually diminishes and eventually disappears as the conditioned stimulus is repeatedly presented without the unconditioned stimulus.
Spontaneous Recovery
The reemergence of a previously extinguished conditioned response after a pause.
Classical Conditioning
A teaching process in which two stimuli are repetitively paired; a response first initiated by the second stimulus eventually becomes initiated by the first stimulus alone.
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