Justus-Liebig-University,Giessen,Germany;
HG&H Pharmaceuticals(Pty)Ltd.,Bryanston,South Africa;
NeuroCode AG,Wetzlar,Germany;
Sceletium tortuosum; Zembrin^(█); EEG; Psychophysiology; Spectral Power; CATEEM^(█); Psychometry; Anxiety; Stress; Cognitive;