these observations revealed that the increased non-nutritive oral activity of such piglets did not appear to be caused by an increased release of dopamine in the brain , since it was not associated with increases in the concentrations of the acidic metabolites of dopamine in either the caudate nucleus , the putamen , the nucleus accumbens , the olfactory tubercle , the hypothalamus , or the substantia nigra .
C0006104
brain
C0086045
concentrations