The knowledge graph.
Explore substances, mechanisms, and effects. Select a node to read its article and inspect the evidence.
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Substances
Concepts
- Stimulantclass
- Methylxanthinechemical-family
- Adenosine antagonistmechanism
- Adenosineneurotransmitter
- CYP1A2enzyme
- Attentionoutcome
- Sleepoutcome
- Adenosine receptorstarget
- Tobacco-smoke exposureexposure
- Subjective alertnesseffect
- Anxiety and jitterinesseffect
Relationships
Editorial index: substances classified under stimulant. This index does not assert a combined effect. Compounds associated with increased arousal; mechanisms and risks differ.
Source 1 ↗Source 2 ↗Editorial index: substances classified under methylxanthine. This index does not assert a combined effect. A chemical family that includes caffeine.
- Methylxanthineindex concept
- Caffeineindexed substance
Editorial index: substances classified under adenosine antagonist. This index does not assert a combined effect. Blocks adenosine receptor signaling.
- Adenosine antagonistindex concept
- Caffeineindexed substance
Editorial index: substances classified under adenosine. This index does not assert a combined effect. A neuromodulator involved in sleep pressure and arousal.
Source 1 ↗Editorial index: substances classified under cyp1a2. This index does not assert a combined effect. A liver enzyme important in caffeine metabolism; activity varies with exposures and physiology.
Source 1 ↗Editorial index: substances classified under attention. This index does not assert a combined effect. Performance on tasks that test selecting or switching attention. A task result does not measure general intelligence or subjective focus.
- Attentionindex concept
- Caffeineindexed substance
- L-theanineindexed substance
Editorial index: substances classified under sleep. This index does not assert a combined effect. Measured sleep outcomes, such as onset time and continuity. Direction and clinical meaning depend on the endpoint and population.
Source 1 ↗Source 2 ↗Editorial index: substances classified under adenosine receptors. This index does not assert a combined effect. Receptors activated by adenosine; caffeine antagonism changes signaling without removing the physiological need for sleep.
- Adenosine receptorsindex concept
- Caffeineindexed substance
Editorial index: substances classified under tobacco-smoke exposure. This index does not assert a combined effect. Smoke exposure can induce CYP1A2 activity. This context is distinct from nicotine exposure and from the route of caffeine administration.
- Tobacco-smoke exposureindex concept
- Caffeineindexed substance
Editorial index: substances classified under subjective alertness. This index does not assert a combined effect. A reported sense of being awake and responsive. It can change independently of objective task performance or later sleep.
- Subjective alertnessindex concept
- Caffeineindexed substance
Editorial index: substances classified under anxiety and jitteriness. This index does not assert a combined effect. Uncomfortable arousal or unease reported after exposure. The experience depends on dose, sensitivity and context.
- Anxiety and jitterinessindex concept
- Caffeineindexed substance
Caffeine's adenosine antagonism connects a molecule, mechanism, transmitter system and functional class.
- Stimulantfunctional-class
- Adenosine antagonistmechanism
- Adenosineendogenous-ligand
- Adenosine receptorstarget
- Caffeineagent
Tobacco-smoke exposure induces CYP1A2. The study measured declining caffeine clearance after cessation; enzyme activity decline is not caffeine elimination half-life.
- CYP1A2metabolizing-enzyme
- Tobacco-smoke exposureexposure-context
- Caffeinesubstrate
The sleep connection represents possible disruption, not a sleep benefit.
Source 1 ↗A small randomized study tested the combination. Co-study is not a recommendation to combine substances.
- Attentionmeasured-outcome
- Caffeineco-exposure
- L-theanineco-exposure
Relationship nodes connect multiple concepts in one sourced statement. Member roles identify the substance, biological target, measured outcome, or exposure context. Editorial index relationships group classifications. Connections are not recommendations to combine substances.