Cited by 75Sleep and Work-Related FatigueNeurotransmitter Receptor Influence on BehaviorNeural and Behavioral Psychology Studies

Tyrosine improves working memory in a multitasking environment

Thomas, John R, Lockwood, Park A, Singh, Anita, Deuster, Patricia A·1999·Pharmacology Biochemistry and Behavior

Abstract

Previous studies indicate that tyrosine may prove useful in promoting improved performance in situations in which performance is compromised by stress. To extend the generality of previous tyrosine findings, the present study examined the effects of tyrosine ingestion on performance during both a Multiple Task and a Simple Task battery. The multiple task battery was designed to measure working memory, arithmetic skills, and visual and auditory monitoring simultaneously, whereas the simple task battery measured only working memory and visual monitoring. Ten men and 10 women subjects underwent these batteries 1 h after ingesting 150 mg/kg of l-tyrosine or placebo. Administration of tyrosine significantly enhanced accuracy and decreased frequency of list retrieval on the working memory task during the multiple task battery compared with placebo. However, tyrosine induced no significant changes in performance on the arithmetic, visual, or auditory tasks during the Multiple Task, or modified any performance measures during the Simple Task battery. Blood levels of ACTH and cortisol were not, but heart rate and blood pressure were significantly increased during the performance tasks. The present results indicate that tyrosine may sustain working memory when competing requirements to perform other tasks simultaneously degrade performance, and that supplemental tyrosine may be appropriate for maintaining performance when mild to severe decrements are anticipated.

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Crossref · 10.1016/s0091-3057(99)00094-5

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27 of 27 references verified0 citation errors · 0 not checkable

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  • TYR may replete cognitive resources, but only under sufficiently demanding conditions.

    “The results revealed beneficial effects of TYR supplementation when competing requirements to perform other tasks simultaneously degrade performance (Thomas et al., 1999). This indicates that TYR may replete cognitive resources, but only under sufficiently demanding conditions.”

    From Working Memory Reloaded: Tyrosine Repletes Updating in the N-Back Task (2013) · cites this paper as Thomas et al., 1999

  • Two studies found higher working memory scores in the tyrosine group on multitasking tasks.

    “The other two studies observed higher scores of the tyrosine group on working memory tasks that require multitasking (Colzato et al., 2013;Thomas et al., 1999).”

    From Behavioral and cognitive effects of tyrosine intake in healthy human adults (2015) · cites this paper as Thomas et al., 1999

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Authors
Thomas, J. R., Lockwood, P. A., Singh, A., & Deuster, P. A.
Affiliations
Uniformed Services University of the Health Sciences (US)
Corresponding author
Deuster, Patricia A
Venue
Pharmacology Biochemistry and Behavior
Publisher
Elsevier BV
Published
1999-11
Volume
64
Issue
3
Pages
495-500
ISSN
0091-3057 (ISSN-L)
OpenAlex
W2081268267
Cited by
75
References
28
Citations by year
2025: 2 · 2024: 3 · 2023: 4 · 2022: 4 · 2021: 5 · 2020: 3 · 2019: 7 · 2018: 3 · 2017: 8 · 2016: 2 · 2015: 5 · 2014: 8 · 2013: 3 · 2012: 1
FWCI
2.29
Type
journal article
Language
en
Open access
closed
Locations
  • Pharmacology Biochemistry and Behavior (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Social Sciences › Psychology › Experimental and Cognitive Psychology › Sleep and Work-Related Fatigue
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Neural and Behavioral Psychology Studies
Keywords
tyrosine, working memory, multitasking, cognitive performance, stress, dietary supplementation, arithmetic performance, visual monitoring, auditory monitoring, heart rate, blood pressure, ACTH, cortisol
MeSH terms
Adrenocorticotropic Hormone, Adult, Attention, Auditory Perception, Catecholamines, Endocrine Glands, Female, Hemodynamics, Humans, Male, Memory, Short-Term, Psychomotor Performance, Stimulation, Chemical, Tyrosine, Visual Perception

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