Food for Your Mind? The Effect of Tyrosine on Selective Attention
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The amino acid tyrosine is the precursor of dopamine and norepinephrine and can be administered as a dietary supplement. Previous studies have demonstrated that the intake of tyrosine can enhance both working memory performance and response inhibition (e.g., Colzato et al., Frontiers in Behavioral Neuroscience, 72013; Colzato et al., Neuropsychologia, 62, 398–402, 2014). In this study, we tested whether the consumption of tyrosine improved the performance of female participants in the Attention Network Test (ANT; Fan et al., Journal of Cognitive Neuroscience, 14, 340–347 2002) and the Stroop task (Stroop, Journal of Experimental Psychology, 18, 643–662 1935). Tyrosine marginally improved the resolution of interference in the Stroop task and had some impact on average reaction times. We conclude that more research is required as to understand the mechanisms through which tyrosine influences cognitive functioning. At this point in time, it remains unclear at best whether the consumption of tyrosine can be advised as a dietary supplement to support cognition.
KeywordsSelective attention Tyrosine Dopamine Cognitive enhancement
Compliance with Ethical Standards
The experimental protocol was approved by the ethics committee of the University of Trier and was conducted in accordance with the latest revision of the Declaration of Helsinki.
Conflict of Interest
The authors declare that they have no conflict of interest.
- Chen, J., Lipska, B. K., Halim, N., Ma, Q. D., Matsumoto, M., Melhem, S., et al. (2004). Functional analysis of genetic variation in catechol-O-methyltransferase (COMT): Effects on mRNA, protein, and enzyme activity in postmortem human brain. The American Journal of Human Genetics, 75, 807–821.CrossRefGoogle Scholar
- Colzato, L. S., Jongkees, B. J., Sellaro, R., & Hommel, B. (2013). Working memory reloaded: tyrosine repletes updating in the N-back task. Frontiers in Behavioral Neuroscience, 7. https://doi.org/10.3389/fnbeh.2013.00200.
- Cools, R., & D’Esposito, M. (2010). Dopaminergic modulation of flexible cognitive control in humans. In A. Bjorklund, S. Dunnett, L. Iversen, & S. Iversen (Eds.), Dopamine handbook (pp. 249–260). Oxford: Oxford University Press.Google Scholar
- Jeffreys, H. (1961). Theory of probability. Oxford, England: Oxford University Press.Google Scholar
- Jongkees, B. J., Hommel, B., Kühn, S., & Colzato, L. S. (2015). Effect of tyrosine supplementation on clinical populations and healthy populations under stress or cognitive demands: a review. Journal of Psychiatric Research, 70, 50–57. https://doi.org/10.1016/j.jpsychires.2015.08.014.CrossRefGoogle Scholar
- Love, J., Selker, R., Marsman, M., Jamil, T., Dropmann, D., Verhagen, A. J., . . . Morey, R. D. (2015). JASP (Version 0.7) [computer software]. Amsterdam.Google Scholar
- Tukey, J. W. (1977). Exploratory data analysis. Reading: Addison-Wesley.Google Scholar
- Wagenmakers, E.–J., Wetzels, R., Borsboom, D., & van der Maas, H. L. (2011). Why psychologists must change the way they analyze their data: The case of psi: Comment on Bem (2011). Journal of Personality and Social Psychology, 100, 426–432. https://doi.org/10.1037/a0022790
- Wittchen, H. U., & Beloch, E. (1997). Instruktionsmanual zur Durchführung von DIA-X-interviews; diagnostisches Expertensystem für psychische Störungen. Harcourt Test Services.Google Scholar
- Wühr, P., & Frings, C. (2008). A Case for inhibition: visual attention suppresses the processing of irrelevant objects. Journal of Experimental Psychology: General, 137, 116–130.Google Scholar