Test whether L-tyrosine retains working memory / attention phenotype under AMPT / catecholamine-depletion match that abolishes catecholamine-class stress-WM rescue

L-tyrosine stress / cold / combat working-memory phenotypes are often framed as catecholamine-precursor replenishment, yet published phenotype priors lack an AMPT abolish arm. This discussion asks whether any residual L-tyrosine WM / attention phenotype survives an AMPT / catecholamine-depletion-matched block that abolishes catecholamine-class stress-WM rescue on the same panel.

Claim

On a pre-registered acute/subacute working memory / attention panel with a catecholamine-class positive stress-WM-rescue arm, an AMPT or catecholamine-depletion-matched condition that abolishes catecholamine-class stress-WM rescue, and an L-tyrosine arm: under the same condition that abolishes catecholamine-class stress-WM rescue, L-tyrosine retains residual working memory / attention phenotype ≥50% of L-tyrosine-alone (WM / attention units as pre-specified; α/N pre-specified) — assumption-kill / catecholamine-insufficiency.

Why it matters

L-tyrosine stress / cold / combat / flexibility working-memory phenotypes are often framed as catecholamine-precursor replenishment; Mahoney cold Match-to-Sample, Deijen combat/noise stress cognition, and Steenbergen task-switching are phenotype priors without an AMPT abolish arm. N22 asks whether residual L-tyrosine WM / attention phenotype survives an AMPT / catecholamine-depletion-matched condition that kills catecholamine-class stress-WM rescue — catecholamine-insufficiency assumption-kill. Distinct from N15 (residual modafinil PVT under DAT-matched block); N16 ≠ N22 (not creatine plasma/PCr); N17 ≠ N22 (not Hericium×NGF/TrkA); N18 ≠ N22 (not L-theanine×adenosine); N19 ≠ N22 (not Rhodiola×HPA/cortisol); N20 ≠ N22 (not Bacopa×AChE); N21 ≠ N22 (not nicotine×nAChR); N2 holds sole ip_class=none; NOT MB/MAOI. Soft-claims: discussion — matched residual-L-tyrosine under AMPT / catecholamine-depletion that abolishes catecholamine-class stress-WM rescue H2H UNKNOWN; PRIOR_ART UNKNOWN (phenotype priors FOUND; residual-positive under abolish absent; tyrosine-benefit-abolished-by-AMPT necessity absent); soft-complete empty ≠ novelty / ≠ failure; N1–N21 ≠ proof.

Mechanism sketch

Catecholamine-insufficiency assumption-kill: L-tyrosine moves human stress / cold / combat / flexibility working memory and attention phenotypes, and AMPT / catecholamine-precursor depletion can frame catecholamine-class WM necessity (TPD→SWM; AMPT×sleep-dep / attentiveness adjacent); no published head-to-head scores residual L-tyrosine WM / attention under an AMPT / catecholamine-depletion-matched condition that abolishes catecholamine-class stress-WM rescue on the same panel. Prefer a same-panel acute/subacute WM / attention lock (named published Mahoney/Shurtleff-class cold Match-to-Sample / DMTS, or Deijen-class stress / combat cognition panel) with catecholamine-class positive stress-WM rescue ± AMPT or named catecholamine-depletion-matched abolish condition vs L-tyrosine ± same condition before treating catecholamine-precursor replenishment as sole-necessary for the tyrosine phenotype; optional cell / SPR / catecholamine-turnover overlay only if a named published depletion-verification system locks residual first (or as cheap parallel). Phenotype priors (Mahoney 17585971; Deijen 10230711; Deijen 8293316; Steenbergen 25598314) lack AMPT abolish arms; adjacent TPD/AMPT cognition (15107182; 17290373; 1356024; 12479964) frames abolish-arm design but ≠ tyrosine residual H2H; tyrosine-benefit-abolished-by-AMPT necessity also absent — so not auto-PARTIAL. Competing caveats: abolish condition fails to kill catecholamine-class stress-WM rescue / L-tyrosine-alone null / underpowered strata / assay-identity mismatch (phenotype ≠ residual; TPD/AMPT cognition ≠ tyrosine residual-under-abolish; necessity-against-residual absent ≠ residual-positive) leave the test inconclusive rather than refuted; soft-complete empty ≠ novelty / ≠ residual-gain proof; N15 ≠ this; N16 ≠ this; N17 ≠ this; N18 ≠ this; N19 ≠ this; N20 ≠ this; N21 ≠ this. NOT MB/MAOI (SERIES_FROZEN).

Prior art

• PMID 17585971 / DOI 10.1016/j.physbeh.2007.05.003 — Mahoney: tyrosine mitigates Match-to-Sample WM decrements during cold exposure (Physiol Behav 2007) — phenotype prior stress/cold WM; no AMPT / catecholamine-depletion abolish arm. doi.org HEAD 302.
• PMID 10230711 / DOI 10.1016/s0361-9230(98)00163-4 — Deijen: tyrosine improves memory and tracking in cadets after combat training course (Brain Res Bull 1999) — phenotype prior combat/stress cognition; no AMPT arm. doi.org HEAD 302.
• PMID 8293316 / DOI 10.1016/0361-9230(94)90200-3 — Deijen: tyrosine improves stress-sensitive cognitive tasks under 90 dB noise (Brain Res Bull 1994) — phenotype prior stress cognition; no AMPT arm. doi.org HEAD 302.
• PMID 25598314 / DOI 10.1016/j.neuropsychologia.2015.01.022 — Steenbergen: tyrosine reduces task-switching costs / promotes cognitive flexibility (Neuropsychologia 2015) — DA-bridged flexibility phenotype prior; no AMPT / stressor-abolish arm. doi.org HEAD 302.

Baseline claimed

Under AMPT or a catecholamine-depletion-matched condition that abolishes catecholamine-class stress-WM rescue, L-tyrosine still retains working memory or attention phenotype on the same panel — or Mahoney/Deijen/Steenbergen already prove residual under AMPT — or TPD/AMPT cognition already settles tyrosine residual — or N15 modafinil-DAT residual / N16 plasma-Cr/PCr / N17 Hericium-NGF/TrkA / N18 theanine-adenosine / N19 Rhodiola-HPA / N20 Bacopa-AChE / N21 nicotine-nAChR / N1–N21 already settle residual L-tyrosine under catecholamine-depletion match.

Baseline measured

Mahoney cold Match-to-Sample WM phenotype LITERATURE (PMID 17585971). Deijen combat-course memory/tracking phenotype LITERATURE (PMID 10230711). Deijen noise-stress cognition phenotype LITERATURE (PMID 8293316). Steenbergen task-switching flexibility phenotype LITERATURE (PMID 25598314). Matched residual-L-tyrosine under AMPT / catecholamine-depletion that abolishes catecholamine-class stress-WM rescue UNKNOWN (soft-complete Q_resid/Q_resid_tight NON-MATCH; residual-positive H2H not found; tyrosine-benefit-abolished-by-AMPT necessity not found; phenotype ≠ residual; TPD/AMPT adjacent ≠ tyrosine residual H2H). Residual L-tyrosine phenotype ≥50% of L-tyrosine-alone when catecholamine-class stress-WM rescue abolished PREDICTION. N15 ≠ N22; N16 ≠ N22; N17 ≠ N22; N18 ≠ N22; N19 ≠ N22; N20 ≠ N22; N21 ≠ N22; N1–N21 ≠ proof — soft-complete empty ≠ novelty / ≠ residual-gain proof.

Actionable limitations

1. Do not treat N1–N21 as proving N22 — 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; N18 is L-theanine residual under caffeine-matched adenosine; N19 is Rhodiola residual under HPA/cortisol-matched challenge; N20 is Bacopa residual under donepezil/AChE occupancy match; N21 is nicotine residual under mecamylamine/nAChR block; soft-complete empty ≠ demonstrated residual gain.
2. Phenotype ≠ residual — Mahoney 17585971 / Deijen 10230711 / Deijen 8293316 / Steenbergen 25598314 lack AMPT abolish arms. Adjacent TPD/AMPT cognition (15107182 TPD→SWM; 17290373 TPD no SWM; 1356024 AMPT×sleep-dep; 12479964 AMPT attentiveness) frames abolish-arm design but ≠ tyrosine residual-under-AMPT H2H. Tyrosine-benefit-abolished-by-AMPT necessity NOT FOUND — do not invent residual or auto-PARTIAL.
3. Phenotype priors lack catecholamine-insufficiency residual-under-abolish arms; lock same-panel acute/subacute WM / attention (prefer named published Mahoney/Shurtleff-class cold Match-to-Sample / DMTS or Deijen-class stress/combat cognition; optional cell/SPR / catecholamine-turnover overlay after abolish×residual locks) with catecholamine-class positive stress-WM rescue ± AMPT or catecholamine-depletion-matched challenge vs L-tyrosine ± same condition; no dosing; NOT MB/MAOI; not N15–N21 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

Ablate

• remove same-panel contrast of residual L-tyrosine WM / attention phenotype under AMPT or catecholamine-depletion-matched condition that abolishes catecholamine-class stress-WM rescue: Without the abolish×residual H2H on a Mahoney/Deijen-class WM/attention panel with a catecholamine-class positive stress-WM-rescue arm, separate phenotype LITERATURE and adjacent TPD/AMPT cognition cannot show catecholamine-insufficiency.
• remove verified abolish gate (AMPT or catecholamine-depletion match that abolishes catecholamine-class stress-WM rescue) plus L-tyrosine-alone comparator as the residual gate: Without verified catecholamine-class abolish and L-tyrosine-alone comparator under the same condition, residual L-tyrosine is just “another precursor under nonspecific catecholamine challenge,” not an assumption-kill of catecholamine-class sufficiency for the tyrosine phenotype.
• remove N15≠N22 + N16≠N22 + N17≠N22 + N18≠N22 + N19≠N22 + N20≠N22 + N21≠N22 + N1–N21≠proof + soft-complete-empty≠novelty + phenotype≠residual + TPD/AMPT≠tyrosine-residual + necessity-absent≠auto-PARTIAL + NOT-MB/MAOI + ip_class≠none discipline: Treating N15–N21 residuals, Mahoney/Deijen/Steenbergen phenotype as residual-positive under AMPT, empty/adjacent PubMed, or TPD/AMPT cognition as already deciding residual L-tyrosine under catecholamine-depletion-matched abolish would invent an H2H result left UNKNOWN.

Refute if

On the pre-registered acute/subacute working memory / attention panel, under AMPT or a catecholamine-depletion-matched condition that abolishes catecholamine-class stress-WM rescue, residual L-tyrosine working memory / attention phenotype falls below 50% of L-tyrosine-alone (WM / attention units as pre-specified) — so catecholamine-class sufficiency for the tyrosine phenotype survives and catecholamine-insufficiency fails — when abolish-gate, L-tyrosine-alone comparator, and power/assay artifacts that would otherwise leave the test inconclusive are ruled out.

Ask a human

Lock acute/subacute WM / attention assay identity (named published Mahoney/Shurtleff-class cold Match-to-Sample / DMTS or Deijen-class stress/combat cognition panel), catecholamine-class positive-rescue abolish gate under AMPT or named catecholamine-depletion match, L-tyrosine-alone comparator, and optional cell/SPR / catecholamine-turnover overlay only after abolish×residual locks; do not treat N15 or N16 or N17 or N18 or N19 or N20 or N21 or N1–N21 as proof; no dosing; NOT MB/MAOI; not N15 DAT clone; not N16 creatine clone; not N17 NGF/TrkA clone; not N18 theanine-adenosine clone; not N19 HPA/cortisol clone; not N20 Bacopa/AChE clone; not N21 nicotine/nAChR clone; do not burn ip_class=none.

Cheap IP

kill_cost_tier=2 · time_to_refute=6w · ip_class=catecholamine-insufficiency · vault_hold=no

Execution

execution_status=NOT_RUN · fto_status=UNKNOWN · related_prior=N15 (modafinil-DAT residual ≠ tyrosine×catecholamine); N16 (plasma-Cr/PCr ≠ tyrosine×catecholamine); N17 (Hericium×NGF/TrkA ≠ tyrosine×catecholamine); N18 (theanine-adenosine ≠ tyrosine×catecholamine); N19 (Rhodiola-HPA ≠ tyrosine×catecholamine); N20 (Bacopa×AChE ≠ tyrosine×catecholamine); N21 (nicotine×nAChR ≠ tyrosine×catecholamine); N2 holds sole ip_class=none; N1–N21 ≠ 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/N22.card.md card_sha256: c403f69a22e156a3524b208fe51405fb28bb34a091745c91d1cee1d5d9da2d50

Mol Labs public report: PENDING dual-publish