Abstract
The hurdle-jumping response was used as an independent index of conditioned fear to test differences in fear of the startbox predicted by the conditioned-fear interpretation of self-punitive behavior. Following shock-escape training and varying numbers of regular- or punished-extinction trials, subjects were dropped into the startbox with access to the runway blocked and allowed to escape by jumping over a hurdle into a safebox. All subjects learned to jump the hurdle. Subjects given punished extinction showed more fear of the startbox than those given regular extinction. Startbox fear increased with the number of punished-extinctinction trials up to a point and then decreased. The results validate the use of hurdle jumping as an independent index of fear and strongly support the conditioned-fear interpretation of self-punitive behavior.
Published Version
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