We found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleMethylxanthines are the psycho-pharmacologically active constituents of chocolate.AuthorsSmit HJ; Gaffan EA; Rogers PJPublicationPsychopharmacology, 2004, Vol 176, Issue 3-4, p412ISSN0033-3158Publication typearticleDOI10.1007/s00213-004-1898-3