Abstract
Sixteen electrodes aimed at the lateral hypothalamic nucleus were implanted in ten pigeons. Stimulation through these electrodes as the sole reinforcer was shown to maintain a key-pecking response in six cases; in two of these cases the key-pecking response was originally shaped using lateral hypothalamic stimulation as the sole reinforcer. All six of the electrodes which were effective in maintaining key pecking were located in the lateral hypothalamic nucleus; two of the remaining ten electrodes which were ineffective were located in the same nucleus. Concurrent variable interval schedules of reinforcement were used to assess the effects of varying brain-stimulation parameters; increasing stimulus intensity or duration increased the reinforcing value of the stimulus as measured by preference, although the most highly preferred stimulus values maintained low rates of responding.
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