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effect response study feedback participant tryptophan depletion group brain tryptophan performance depletion depression activation van der veen error analysis brain activation measure condition serotonin family history stroop contrast level change stimuli score volunteer psychiatry stimulus amygdala feedback stimulus performance monitoring fh − group expression neu words disorder difference cc words right processing interference psychopharmacology history factor treatment incongruent stimuli family order monitoring electro-cortical incongruent session 5- ht metabolism unipolar depression mixture plasma affective patient stroop task system number punishment prediction erasmus univ rotterdam interaction emotion cortex stroop interference within-subjects factors sequential ibi trp − condition trp à condition finding time-estimation task sequential eriksen flanker task psychol result deceleration van der molen