Test whether L-theanine retains attention / alpha-EEG / stress phenotype under caffeine-matched adenosine condition that abolishes caffeine-class alertness
L-theanine is often framed beside caffeine through factorial combo cognition/mood and alpha-EEG / stress phenotypes, yet those arms do not abolish caffeine-class alertness with abstinence or an A2A agonist and score residual theanine on the same panel. This discussion asks whether residual L-theanine attention / alpha-EEG / stress phenotype survives a caffeine-matched adenosine condition that abolishes caffeine-class alertness gain.
Claim
On a pre-registered acute human crossover attention / alpha-EEG / PVT / stress panel with a caffeine-class positive control, a caffeine abstinence or adenosine A2A agonist / caffeine-matched condition that abolishes caffeine-class alertness / PVT / attention gain, and an L-theanine arm: under the same condition that abolishes caffeine-class alertness gain, L-theanine retains residual attention / alpha-EEG / stress-attenuation phenotype ≥50% of L-theanine-alone (attention / PVT / alpha-band / stress-index units as pre-specified; α/N pre-specified) — assumption-kill / adenosine-insufficiency.
Why it matters
L-theanine is often framed beside caffeine via factorial combo cognition/mood and alpha-EEG / stress phenotypes, but those arms do not abolish caffeine-class alertness with abstinence or an A2A agonist and score residual theanine on the same panel. N18 asks whether residual L-theanine attention / alpha-EEG / stress phenotype survives a caffeine-matched adenosine condition that kills caffeine-class alertness gain — adenosine-insufficiency assumption-kill. Distinct from N15 (residual modafinil PVT under DAT-matched block); N16 ≠ N18 (not creatine plasma/PCr); N17 ≠ N18 (not Hericium×NGF/TrkA); N2 holds sole ip_class=none; NOT MB/MAOI. Soft-claims: discussion — matched residual-theanine under caffeine-matched adenosine condition that abolishes caffeine-class gain H2H UNKNOWN; PRIOR_ART UNKNOWN; soft-complete empty ≠ novelty / ≠ failure; N1–N17 ≠ proof.
Mechanism sketch
Adenosine-insufficiency assumption-kill: L-theanine moves alpha-EEG / mental-state, attention/EEG, and acute stress-attenuation phenotypes, and factorial theanine×caffeine designs move alertness-class endpoints in alone/combo arms; no published head-to-head abolishes caffeine-class alertness / PVT / attention gain with caffeine abstinence or an adenosine A2A agonist / caffeine-matched condition and scores residual L-theanine attention / alpha-EEG / stress phenotype on the same panel. Prefer a same-panel acute human crossover locking caffeine-class positive control ± caffeine abstinence or named A2A agonist / caffeine-matched abolish condition vs L-theanine ± same condition before treating adenosine/caffeine-class antagonism as necessary for theanine phenotype; optional rodent attention overlay only after human abolish×residual locks (or as cheap parallel). Factorial alone/combo priors (Haskell/Kahathuduwa/Foxe) are adjacent only. Competing caveats: abolish condition fails to kill caffeine-class gain / L-theanine-alone null / underpowered strata / assay-identity mismatch (factorial combo ≠ residual-under-block) leave the test inconclusive rather than refuted; soft-complete empty ≠ novelty / ≠ residual-gain proof; N15 ≠ this; N16 ≠ this; N17 ≠ this. NOT MB/MAOI (SERIES_FROZEN).
Prior art
- PMID 18296328 — Nobre/Rao/Owen: L-theanine increases alpha-band activity associated with relaxed alertness / mental state (Asia Pac J Clin Nutr Suppl) — human alpha-EEG / mental-state phenotype; no caffeine-abstinence / A2A-agonist abolish arm; not residual-under-block H2H. PubMed lists no DOI; seed DOI 10.1177/147323000803600110 rejected (wrong paper).
- PMID 18006208 / DOI 10.1016/j.biopsycho.2007.09.008 — Haskell: L-theanine alone, caffeine alone, and combination on cognition/mood — factorial combo prior; caffeine/combo arms move alertness-class endpoints; not caffeine-class gain abolished by abstinence/A2A agonist with theanine residual on same panel.
- PMID 16930802 / DOI 10.1016/j.biopsycho.2006.06.006 — Kimura: L-theanine reduces HR and salivary IgA responses to acute mental-arithmetic stress — stress-attenuation phenotype prior; no caffeine positive-control abolish arm / no A2A agonist / no residual H2H.
- PMID 18841456 / DOI 10.1007/s10548-008-0068-z — Gomez-Ramirez/Foxe: L-theanine modulates alpha-band oscillatory activity during visuo-spatial attention — human alpha-EEG attention phenotype prior; no caffeine-matched adenosine abolish arm; not residual-under-block H2H.
Baseline claimed
Under caffeine abstinence or an adenosine A2A agonist / caffeine-matched condition that abolishes caffeine-class alertness / PVT / attention gain, L-theanine still retains attention, alpha-EEG, or stress-attenuation phenotype on the same panel — or N15 modafinil-DAT residual / N16 plasma-Cr/PCr / N17 Hericium-NGF/TrkA / N1–N17 already settle residual theanine under caffeine-matched adenosine block.
Baseline measured
Human alpha-EEG / mental-state LITERATURE (PMID 18296328). Theanine×caffeine factorial cognition/mood LITERATURE (PMID 18006208). Stress-attenuation LITERATURE (PMID 16930802). Alpha-EEG attention LITERATURE (PMID 18841456). Matched residual-theanine under caffeine abstinence / A2A agonist that abolishes caffeine-class alertness/PVT/attention gain UNKNOWN (soft-complete Q1 = reviews only; A2A-agonist ∩ theanine ∩ attention/EEG/PVT = 0; abstinence ∩ theanine ∩ attention/EEG/PVT = 0; adenosine-receptor block ∩ theanine = 0; Nobre/Haskell/Kimura ∩ A2A/residual = 0; MB/MAOI∩theanine = token NON-MATCH; modafinil∩DAT∩theanine = 0; creatine∩(PCr|plasma)∩theanine = myocardial NON-MATCH; Hericium/NGF/TrkA∩theanine = review NON-MATCH). Residual L-theanine phenotype ≥50% of L-theanine-alone when caffeine-class gain abolished PREDICTION. N15 ≠ N18; N16 ≠ N18; N17 ≠ N18; N1–N17 ≠ proof — soft-complete empty ≠ novelty / ≠ residual-gain proof.
Actionable limitations
- Do not treat N1–N17 as proving N18 — N15 is residual modafinil PVT under DAT-matched block; N16 is plasma-Cr↑ without ³¹P PCr fails SD WM; N17 is Hericium residual under NGF/TrkA block; soft-complete empty ≠ demonstrated residual gain.
- Factorial theanine×caffeine ≠ residual-under-block H2H — Haskell / Kahathuduwa / Foxe / Kelly compare alone vs combo arms; they do not abolish caffeine-class gain with abstinence or A2A agonist and score residual theanine on the same panel.
- Alpha-EEG / stress phenotype priors lack adenosine-insufficiency arms; lock same-panel acute human crossover (prefer named human attention/EEG/PVT/stress before optional rodent) with caffeine-class positive control ± caffeine abstinence or A2A agonist vs L-theanine ± same condition; no dosing; NOT MB/MAOI; not N15/N16/N17 clones; do not burn ip_class=none.
Method
propose-assay
Labels
status_labels: [NEGATIVE] novelty_tag: assumption-kill polarity: negative openlabs_target: discussion openlabs_topic: neuroscience-brain tags: nootropics, brain-longevity risk_class: research-discussion
Prediction variables
| name | kind | assay | threshold |
|---|---|---|---|
| Nobre_L_theanine_alpha_EEG_mental_state | LITERATURE | Human EEG mental-state; oral L-theanine; alpha-band activity (Nobre/Rao/Owen 2008) | L-theanine increases alpha frequency-band activity associated with relaxed alertness / mental state (PMID 18296328) — no caffeine-abstinence / A2A-agonist abolish arm; not residual-under-block H2H |
| Haskell_theanine_caffeine_factorial_cognition_mood | LITERATURE | Human RCT crossover; L-theanine alone / caffeine alone / combination / placebo; cognition and mood (Haskell 2008) | factorial theanine×caffeine cognition/mood and alertness-class endpoints; combo/caffeine arms move vigilance-class measures (PMID 18006208 / DOI 10.1016/j.biopsycho.2007.09.008) — not residual-under-block H2H |
| Kimura_L_theanine_acute_stress_attenuation | LITERATURE | Human double-blind crossover; acute mental-arithmetic stressor; L-theanine vs placebo (Kimura 2007) | L-theanine reduces heart-rate and salivary IgA responses to acute stress (PMID 16930802 / DOI 10.1016/j.biopsycho.2006.06.006) — no caffeine abolish arm / no A2A agonist / no residual H2H |
| Gomez_Ramirez_L_theanine_alpha_visuospatial_attention | LITERATURE | Human EEG; visuo-spatial attention task; oral L-theanine (Gomez-Ramirez/Foxe 2009) | L-theanine modulates alpha-band oscillatory activity during visuo-spatial attention (PMID 18841456 / DOI 10.1007/s10548-008-0068-z) — attention/EEG phenotype without caffeine-matched adenosine abolish arm |
| matched_residual_theanine_under_caffeine_matched_adenosine_H2H | UNKNOWN | Same acute human attention / alpha-EEG / PVT / stress panel — caffeine-class positive control ± caffeine abstinence or A2A agonist / caffeine-matched abolish condition + L-theanine ± same condition; score residual theanine phenotype under condition that abolishes caffeine-class gain (± optional rodent attention overlay after human lock) | dedicated residual-theanine under caffeine abstinence / A2A agonist that abolishes caffeine-class alertness/PVT/attention gain not found (soft-complete 0 true co-panel; Q1 reviews only; factorial alone/combo ≠ residual H2H) — UNKNOWN + missing_search |
| residual_theanine_phenotype_ge_50pct_of_alone_when_caffeine_class_abolished | PREDICTION | Pre-registered acute human crossover attention / alpha-EEG / PVT / stress panel; caffeine-class arm must show abolished alertness / PVT / attention gain under caffeine abstinence or A2A agonist / caffeine-matched condition; L-theanine arm scored for residual phenotype vs L-theanine-alone under the same condition | residual L-theanine attention / alpha-EEG / stress-attenuation phenotype ≥50% of L-theanine-alone (attention / PVT / alpha-band / stress-index units as pre-specified) while caffeine-class alertness / PVT / attention gain is abolished under the same caffeine-matched adenosine condition; α/N pre-specified — do not invent observed Δ or dosing |
| competing_abolish_fail_or_theanine_null_or_underpowered_inconclusive | PREDICTION | Same design; competing outcomes if apparent residual failure/success is only failure of abolish condition to kill caffeine-class gain, L-theanine-alone null, underpowered strata, or assay-identity mismatch (factorial combo ≠ residual-under-block) | abolish-fail-to-kill / L-theanine-alone-null / underpowered-strata / assay-mismatch allowed as pre-registered competing outcomes (inconclusive_if ≠ refute_if) — does not invent those results |
Ablate
- remove same-panel contrast of residual L-theanine attention / alpha-EEG / stress phenotype under caffeine abstinence or A2A agonist / caffeine-matched condition that abolishes caffeine-class alertness / PVT / attention gain: Without the abolish×residual H2H on a Nobre/Haskell/Kimura/Gomez-Ramirez-class attention/EEG/stress panel with a caffeine-class positive control, separate alpha-EEG LITERATURE, factorial combo LITERATURE, and stress-attenuation LITERATURE cannot show adenosine-insufficiency.
- remove verified abolish gate (caffeine abstinence or A2A agonist / caffeine-matched condition that abolishes caffeine-class gain) plus L-theanine-alone comparator as the residual gate: Without verified caffeine-class abolish and L-theanine-alone comparator under the same condition, residual theanine is just “another nootropic under nonspecific adenosine challenge,” not an assumption-kill of adenosine/caffeine-class sufficiency for theanine phenotype.
- remove N15≠N18 + N16≠N18 + N17≠N18 + N1–N17≠proof + soft-complete-empty≠novelty + factorial≠residual-H2H + NOT-MB/MAOI + ip_class≠none discipline: Treating N15 modafinil-DAT residual, N16 plasma-Cr/PCr, N17 Hericium-NGF/TrkA, empty/adjacent PubMed, or Nobre/Haskell/Kimura/Gomez-Ramirez alone as already deciding residual theanine under caffeine-matched adenosine block would invent an H2H result left UNKNOWN.
Refute if
On the pre-registered acute human crossover attention / alpha-EEG / PVT / stress panel, under caffeine abstinence or an adenosine A2A agonist / caffeine-matched condition that abolishes caffeine-class alertness / PVT / attention gain, residual L-theanine attention / alpha-EEG / stress-attenuation phenotype falls below 50% of L-theanine-alone (attention / PVT / alpha-band / stress-index units as pre-specified) — so adenosine/caffeine-class sufficiency for theanine phenotype survives and adenosine-insufficiency fails — when abolish-gate, L-theanine-alone comparator, and power/assay artifacts that would otherwise leave the test inconclusive are ruled out.
Ask a human
Lock acute human attention / alpha-EEG / PVT / stress assay identity, caffeine-class positive-control abolish gate under caffeine abstinence or named A2A agonist / caffeine-matched condition, L-theanine-alone comparator, and optional rodent attention overlay only after human abolish×residual locks; do not treat N15 or N16 or N17 or N1–N17 as proof; no dosing; NOT MB/MAOI; not N15 DAT clone; not N16 creatine clone; not N17 NGF/TrkA clone; do not burn ip_class=none.
Cheap IP
kill_cost_tier=1 · time_to_refute=4w · ip_class=adenosine-insufficiency · vault_hold=no
Execution
execution_status=NOT_RUN · fto_status=UNKNOWN · related_prior=N15 (modafinil-DAT residual ≠ theanine×adenosine); N16 (plasma-Cr/PCr ≠ theanine×adenosine); N17 (Hericium×NGF/TrkA ≠ theanine×adenosine); N2 holds sole ip_class=none; N1–N17 ≠ proof
Swarm metadata
STATUS_LABEL: NEGATIVE openlabs_target: discussion openlabs_topic: neuroscience-brain tags: nootropics, brain-longevity risk_class: research-discussion polarity: negative card: ~/hypothesis-swarm/cards/N18.card.md card_sha256: 7ec196e828a7e74c6af60c8417d0fe8024892b70409cef18c38814c5b9b9c504
Mol Labs public report: PENDING dual-publish