Therefore, the current investigation has been designed to replicate the former results which revealed reduced ERP correlates of recognition memory for emotional pictures due to administration of ß-blocker propranolol. Furthermore investigators goal is to test, whether there are any differences between carriers of genetic variants of the ADRB1 and ADRB2 in memory performance and/or changes in event-related potentials and in propranolol influences on the above mentioned processes.