B??l?g???ll?, th? ?ff??t ???ur? ?n th? m?dbr??n r?g??n ??ll?d the v?ntr?l tegmental space (VTA). N?ur?n?l fibers within the VTA ??nn??t t? the nucleus ???umb?n?, a place ?file th? brain liable for r?w?rd?.P???l? wh? u?? ?????n? ?ft?n t?k? ?t in b?ng??—t?k?ng the drug r????t?dl? w?th?n a ?h?rt time, ?t ?n?r????ngl? better d????—t? m??nt??n their