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<p><b>Operant conditioning</b>, also called <b>instrumental conditioning</b>, is a learning process in which voluntary behaviors are modified by association with the addition (or removal) of reward or aversive stimuli. The frequency or duration of the behavior may increase through <a href="page.php?w=reinforcement">reinforcement</a> or decrease through <a href="page.php?w=punishment">punishment</a> or <a href="page.php?w=Extinction_%28psychology%29">extinction</a>.</p>

<p><big>Origins</big></p>
<p>Operant conditioning originated with <a href="page.php?w=Edward_Thorndike">Edward Thorndike</a>,</p><p>
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