top of page


Dodd FL, Kennedy DO, Riby LM, Haskell-Ramsay CF (2015) A double-blind, placebo-controlled study evaluating the effects of caffeine and L-theanine both alone and in combination on cerebral blood flow, cognition and mood. Psychopharmacology 232(14): 2563-76

Haskell CF, Dodd FL, Wightman EL, Kennedy DO (2013) Behavioural effects of compounds co-consumed in dietary forms of caffeinated plants. Nutrition Research Reviews 26: 49-70

Kennedy DO and Haskell CF (2011) Cerebral blood flow and behavioural effects of caffeine in habitual and non-habitual consumers of caffeine: A Near Infrared Spectroscopy study. Biological Psychology 86:298-306

Haskell CF, Kennedy DO, Milne AL, Wesnes KA, Scholey AB (2008) The effects of l-theanine, caffeine and their combination on cognition and mood. Biological Psychology 77:113-22

Scholey AB and Haskell CF (2008) Neurocognitive effects of guarana [invited review]. Drugs of the Future 33:869-874

Kennedy DO, Haskell CF, Robertson B, Reay J, Brewster-Maund C, Luedemann J, Maggini S, Ruf M, Zangara A, Scholey AB (2008) Improved cognitive performance and mental fatigue following a multi-vitamin and mineral supplement with added guarana (Paullinia cupana). Appetite 50:506-13

Haskell CF, Kennedy DO, Wesnes KA, Milne AL, Scholey AB (2007) A double-blind, placebo-controlled, multi-dose evaluation of the acute behavioural effects of guarana in humans. Journal of Psychopharmacology 21: 65-70

Haskell CF, Kennedy DO, Wesnes KA, Scholey AB (2005) Cognitive and mood improvements of caffeine in habitual consumers and habitual non-consumers of caffeine. Psychopharmacology 179:813-25

Kennedy DO, Haskell CF, Wesnes KA, Scholey AB (2004) Improved cognitive performance in human volunteers following administration of guarana (Paullinia cupana) extract: comparison and interaction with Panax ginseng. Pharmacology, Biochemistry & Behavior 79(3):401-11

Kennedy DO and Scholey AB (2004) A glucose-caffeine 'energy drink' ameliorates subjective and performance deficits during prolonged cognitive demand. Appetite 42:331-333

Scholey AB and Kennedy DO (2004) Cognitive and physiological effects of an "energy drink": an evaluation of the whole drink and of glucose, caffeine and herbal flavouring fractions. Psychopharmacology 176:320-330

Mackay M, Tiplady B & Scholey AB (2002) Interactions between alcohol and caffeine in relation to psychomotor speed and accuracy. Human Psychopharmacology- Clinical and Experimental, 17: 151-156

bottom of page