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Effects of post-training d-amphetamine on acquisition of an appetitive autoshaped lever press response in rats

Abstract

This experiment examined the effect of post-training d-amphetamine on retention in an appetitive autoshaping conditioning situation. Harlan Sprague-Dawley rats were first given ten autoshaping trials, followed by either three or four additional sessions of 50 trials (70 s intertrial interval) on which the conditioned stimulus (the extension of an illuminated Plexiglas lever for 10 s) and unconditioned stimulus (a 45 mg food pellet), were paired. d-Amphetamine (1 or 2 mg/kg) or saline was administered IP either immediately or 2 h following training. Rats injected with 1 mg/kg d-amphetamine immediately after the first training session made significantly more responses during the conditioned stimulus presentation on the following daily session of 50 trials. Thus, the amphetamine-treated rats acquired the lever press response faster than those given only saline. The amphetamine effects were time dependent: no significant effects were found if the injection was delayed until 2 h following training. These results agree with the findings of other instrumental aversive facilitation studies and suggest that d-amphetamine may enhance retention of the classically conditioned components of autoshaping.

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Oscos, A., Martinez, J.L. & McGaugh, J.L. Effects of post-training d-amphetamine on acquisition of an appetitive autoshaped lever press response in rats. Psychopharmacology 95, 132–134 (1988). https://doi.org/10.1007/BF00212781

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Key words

  • Autoshaping
  • Amphetamine
  • Appetitive conditioning
  • Facilitation of acquisition
  • Memory
  • Rats