Abstract
The effects of pentazocine (3–30 mg/kg) and naloxone (3–100 mg/kg) were determined on the treadle-pressing behavior of pigeons under a schedule of shock postponement. Pentazocine increased the mean rate of responding at the 10 mg/kg dose, and greatly increased the mean shock rate at 30 mg/kg. Naloxone increased the mean response rate at all doses tested, without any increases in shock rates.

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