Motivational properties of opioids: evidence that an activation of 6-receptors mediates reinforcement processes (Shippenberg 1987)
Place preference conditioning reveals the involvement of D -dopamine receptors in the motivational properties of μ- and k-opioid agonists (Shippenberg 1987)
Motivational effects of opioids: influence of D-1 versus D-2 receptor antagonists (Shippenberg 1988)
- The apparatus consists of shuttle box (30 x 60 x 30 cm) composed of plexiglass equipped with a loose-fitting lid.
- One compartment is white, the other is black. The floors of the compartments are textured white and smooth black, respectively.
- For test sessions, a partition which separated the two compartments was raised 12 cm above the floor and a 5 x 2 cm steel mesh platform was inserted along the seam separating the compartments.