We found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleReinforcing effects of caffeine and theobromine as found in chocolate.AuthorsSmit HJ; Blackburn RJPublicationPsychopharmacology, 2005, Vol 181, Issue 1, p101ISSN0033-3158Publication typearticleDOI10.1007/s00213-005-2209-3