Neuroleptics block high- but not low-dose heroin place preferences: further evidence for a two-system model of motivation (Nadar 1994)



  • One environment was white with a wire mesh floor that was covered with wood chips.
  • The other environment was black with a smooth Plexiglas floor.
  • A narrow neutral gray zone separated two test compartments, each of which was the same as one of the two conditioning environments.

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