Luu, P.

system reactive proactive model control program behavior approach avoidance function tucker serotonin brain cortex ventral reactive approach temperament context drive activity attention aspect cholinergic context models reward carver neuromodulator action cognition reactive avoidance dorsal figure environment noradrenergic proactive approach psychology adaptive response noradrenalin memory neuromodulation proactive system research dopaminergic neurosci dopamine study section disorder level activation element psychol emotion article processing motor prefrontal personality september serotonergic motivational impulsivity affective inhibition pathway evidence volume context model 2010   al neuromodulation 152  neuromodulator systems reactive systems stimuli distinction contrast regulation network university