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Long-term memory for and extinction of trace conditioning were examined using the rabbit nictitating membrane response (NMR) preparation. Rabbits were trained on four consecutive days with 80 trials of a 100-ms tone followed 500 ms later by a 100-ms periorbital electrical pulse. After a period of 1, 2, 3, or 6 months in their home cages, rabbits were given four consecutive days of 80 tone-alone extinction...
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