Logical Memory subtest (Wechsler Memory Scale) — classic episodic memory test. Read a short story (~30 sec), then distractor (arithmetic 30 sec) — immediate recall (write what you remember). Then distractor 90 sec — delayed recall. Biomarkers: immediate_recall_pct, delayed_recall_pct, retention_rate (delayed/immediate; ≥0.85 = normal). Critical for business: do you remember meeting details after 1.5 min of distraction.