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Punishment may also be applied on moral, especially religious, grounds, as in penance (which is voluntary) or imposed in a theocracy with a religious police (as in a strict Islamic state like Iran or under the Taliban) or (though not a true theocracy) by Inquisition.
Thus the retributive theory of punishment with its criterion of justice as an end in itself gives place to a theory which regards punishment solely as a means to an end, utilitarian or moral, according as the common advantage or the good of the criminal is sought.
In operant conditioning, punishment is the presentation of a stimulus contingent on a response which results in a decrease in response strength (as evidenced by a decrease in the frequency of response).
Punishment is any change in an animal's surroundings that occurs after a given behavior or reponse which reduces the frequency of that behavior occuring again in the future.
Aversive stimulus, punisher, and punishing stimulus are synonyms.
Punishment may be used for (a) an aversive stimulus or (b) the occurrence of any punishing change or (c) the part of an experiment in which a particular response is punished.