we examined changes in brain noradrenaline ( na ) turnover as a function of shock controllability and the task complexity ( fixed ratio , fr-1 and fr-3 ) under a 21-hr continuous discriminated sidman avoidance schedule with shock intensity of 0.7-1.0 ma , shock duration of 1.0 sec , shock-shock interval of 1.5 sec , response-shock interval of 100 sec and signal-shock interval of 10 sec , by measuring levels of a principal metabolite of na , 3-methoxy-4-hydroxyphenylethyleneglycol sulfate ( mhpg-so4 ) , in discrete brain regions of male wistar rats .
C0036974
shock
C0028351
na