Dissociations in dopamine release in medial prefrontal cortex and ventral striatum during the acquisition and extinction of classical aversive conditioning in the rat. - Wilkinson ,L.S,.; Humby ,T,.; Killcross ,A.S,.; Torres ,E.M,.; Everitt ,B.J,.; Robbins ,T.W:. (Eur. J. Neurosci., 1998)