Abstract
In an attempt to replicate and extend an experimental demonstration by Keller and Schoenfeld concerning transformation of electric shock into a secondary reinforcer, separate groups of rats learned to lever press for either food or reinforcing electrical stimulation (ESB) to the medial forebrain bundle. The secondary reinforcer was mild footshock, presented through the lever during conditioning. In extinction trials, continued footshock produced greater resistance to extinction than did no shock in both food and ESB groups, suggesting that footshock had assumed the properties of a secondary reinforcer.
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