Wim J. Riedel

Caffeine attenuates scopolamine-induced memory impairment in humans

H. Praag, J. Jolles, E. Hogervorst, 2005, Psychopharmacology.

Tryptophan depletion in normal volunteers produces selective impairment in memory consolidation

W. Riedel, T. Klaassen, N. Deutz, 1999, Psychopharmacology.

The effects of high-dose and low-dose tryptophan depletion on mood and cognitive functions of remitted depressed patients

W. Riedel, L. Booij, D. Fekkes, 2005, Journal of psychopharmacology.