Neurochemical: microdialysis and postmortem measures of dopamine and norepinephrine release using HPLC-EC. Microdialysis probes can be stereotaxically inserted into the prefrontal cortex or striatum to measure extracellular dopamine or norepinephrine in vivo. Sample Chromatogram showing the dopamine peak from a prefrontal cortex sample before drug infusion (PRE) and after infusion (POST). back to Methods Department of Psychology 1202 West Johnson Street University of Wisconsin at Madison Madison, WI 53706-1696 © 2001 by the Board of Regents of the University of Wisconsin System. Last Revised: comments