The role of medial prefrontal cortical dopamine in spontaneous flexibilityin the rat

In rat studies, both lesions in the medial prefrontal cortex (mPFC) and alt erations of the level of mPFC dopamine (DA) have been found to induce distu rbances in behavioural flexibility, as measured with switching tasks. It is not clear whether mPFC DA is also involved in spontaneous flexibility, The refore, the aim of the present study was to investigate the role of mPFC DA in spontaneous flexibility. As a measure for spontaneous flexibility, the diversity in spatial distribution of exploration on a large open field was used. The rats received local injections into the mPFC with a D-1 or D-2 an tagonist, or the dopamimetic, amphetamine, The results showed that both DA antagonists reduced spontaneous flexibility, due to increased stimulus-boun d behaviour. Amphetamine had a similar effect to the DA antagonists. It is suggested that this is most likely due to an amphetamine-induced increase i n extracellular DA, leading to a suboptimal level of mPFC DA, (C) 2001 Lipp incott Williams & Wilkins.