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Heroin, by inhibiting GABAergic interneurons in the VTA, induces local dopaminergic activation and release in the NAC terminals. The role of other basic neurotransmitter systems, such as glutamate in the VTA, in mediating the rewarding effect of addictive drugs, is less established. We explored whether blockade of glutamate receptors in subregions of the VTA modulate the rewarding properties and\/or the development of psychomotor changes induced by opiates. Administration of 6-cyano-7-nitroquinoxaline-2,3-dione (CNQX; an AMPA\/kainate receptor antagonist) into the anterior VTA blocked the rewarding effects of opiates in both the conditioned place preference and the self-administration paradigms without affecting the gradual increase of the psychomotor response to opiates. In contrast, administration of CNQX into the posterior VTA did not affect the rewarding properties of opiates, but blocked the initial sedative effect of opiates and the gradual increase of the psychomotor response to the drug. These findings suggest a critical role for glutamate receptors in the VTA in opiate reward, as well as behavioral and anatomical dissociation between the rewarding and psychomotor effects of opiates.<\/jats:p>","DOI":"10.1523\/jneurosci.1958-08.2008","type":"journal-article","created":{"date-parts":[[2008,8,20]],"date-time":"2008-08-20T19:18:06Z","timestamp":1219259886000},"page":"8406-8416","source":"Crossref","is-referenced-by-count":62,"title":["Dissociation between Rewarding and Psychomotor Effects of Opiates: Differential Roles for Glutamate Receptors within Anterior and Posterior Portions of the Ventral Tegmental 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