L-Theanine and Improved Target-Distractor Discriminability

• High-dose L-theanine-caffeine combination improves neurobehavioural and neurophysiological measures of selective attention in acutely sleep-deprived young adults: a double-blind, placebo-controlled crossover study.

  • 2025-08-12
  • RCT
  • The British journal of nutrition 134(3)
  • • Gayani S Nawarathna
    • Dewasmika I Ariyasinghe
    • Tharaka L Dassanayake

  • PubMed: 40789769
  • DOI: 10.1017/s0007114525104169

  5 Insights on

  • Improved Target-Distractor Discriminability

  • High evidence
  • Adults

  target-distractor discriminability (P = 0·047)

  Effect

  Beneficial

  Effect size

  Small

  Significant

  Yes

  Dose

  200 mg

• Effect of L-theanine on selective attention in a traffic-related reaction task in sleep-deprived young adults: a double-blind placebo-controlled, crossover study.

  • 2024-07-25
  • RCT
  • Nutritional neuroscience 28(4)
  • • Umangi W Karunaratne
    • Tharaka L Dassanayake

  • PubMed: 39052627
  • DOI: 10.1080/1028415x.2024.2383080

  4 Insights on

  • Improved Target-Distractor Discriminability

  • High evidence
  • Adults

  increased A' (i.e. target-distractor discriminability) (p = 0.009), whereas placebo did not (p > 0.05)

  Effect

  Beneficial

  Effect size

  Small

  Significant

  Yes

  Dose

  200 mg