Reports

Alterations in brain norepinephrine metabolism induced by environmental stimuli previously paired with inescapable shock

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Science  05 Sep 1980:
Vol. 209, Issue 4461, pp. 1138-1140
DOI: 10.1126/science.7403874

Abstract

Footshock stress produced an immediate increase in brain concentrations of 3-methoxy-4-hydroxyphenylglycol sulfate (MHPG-SO4), a major metabolite of the neurotransmitter norepinephrine, in the rat brain. Twenty-four hours after footshock stress, when concentrations had returned to baseline, increases in MHPG-SO4 and emotional behavior could be elicited by previously neutral environmental stimuli that had been paired with the stress.