Aversive properties of naloxone in non-dependent (naive) rats may involve blockade of central beta-endorphin (Mucha 1985b)
Motivational properties of kappa and mu opioid receptor agonists studied with place and taste preference conditioning (Mucha 1985a)



  • Place conditioning was carried out using 30 x 60 x 30 cm (w x l x h) Plexiglas boxes.
  • Two equal compartments were painted white or flat black.
  • The floors were either smooth black Plexiglas or textured (diamond pattern) white Plexiglas.

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