1. Institute of Physiology; Faculty of Medicine; Charles University; 5 Albertov Street CS-12800 Prague 2 Czechoslovakia
2. Institute of Physiology, Academy of Sciences; 1083 Vídeňská Street CS-14220 Prague 4 Czechoslovakia
3. Research Laboratory of Psychiatry; Faculty of Medicine; Charles University; 5 Albertov Street CS-12800 Prague 2 Czechoslovakia