Claim

Model ledger-default@0.1.0 ledger-strict@0.1.0 ledger-default@0.2.0 ledger-strict@0.2.0 ledger-default@0.3.0 (default) ledger-strict@0.3.0 Snapshot seq

Topics

Biology · d473d57f Memes · d473d57f

Assessment

Why?

Strongest counted contradiction: The excerpt says goldfish memories span weeks, months, and even years, directly contradicting a three-second memory span. weight 1.800000 evidence

Suppressed as dependent: A cognition researcher says goldfish memories span weeks, months, and even years.; The source reports studies showing goldfish memories can span several months.; Fish-cognition expert Culum Brown says goldfish memories span weeks, months, and years, not three seconds.; Fish cognition researcher Culum Brown says goldfish memories span weeks, months and even years.

Review gaps: independence reviewed, primary source reviewed

What would most change this: One independent, direct measurement that supports this claim would move it from Contradicted to Leans contradicted.

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Checked as part of

Statements this claim was broken out of. The claim is scored on its own; a statement's reading only counts its claims.

• “Goldfish have a memory span of about three seconds.” · 1 claim · 28 September 2026
• “FACT CHECK YOUR TEACHERS 🧠 Humans only use 10% of their brains. Einstein failed math as a kid and still changed physics. The Great Wall of China is the only...” · 8 claims · 19 September 2026
• “FACT CHECK YOUR TEACHERS 🧠 Humans only use 10% of their brains. Einstein failed math as a kid and still changed physics. The Great Wall of China is the only...” · 2 claims · 19 September 2026

Evidence for

None.

Evidence against

• Fish cognition researcher Culum Brown says goldfish memories span weeks, months and even years.

  From Do goldfish really have a 3-second memory? Read 2026-09-19 Relevance DIRECT Steps 0 Counted

• Studies have repeatedly shown that goldfish memories can span several months.

  From Goldfish May Have a Longer Memory Span Than Just Three Seconds Read 2026-09-19 Relevance STRONG Steps 0 Counted

• The excerpt says goldfish memories span weeks, months, and even years, directly contradicting a three-second memory span.

  From Do goldfish really have a 3-second memory? Read 2026-09-19 Relevance DIRECT Steps 0 Counted

• The source reports studies showing goldfish memories can span several months.

  From Goldfish May Have a Longer Memory Span Than Just Three Seconds Read 2026-09-19 Relevance STRONG Steps 0 Counted

  The reported months-long span conflicts with a three-second duration.

• A cognition researcher says goldfish memories span weeks, months, and even years.

  From Do goldfish really have a 3-second memory? Read 2026-09-19 Relevance DIRECT Steps 0 Counted

  The reported weeks-to-years range conflicts with a three-second duration.

• Fish-cognition expert Culum Brown says goldfish memories span weeks, months, and years, not three seconds.

  From Do goldfish really have a 3-second memory? Read 2026-09-28 Relevance DIRECT Steps 0 Counted

  The source explicitly identifies the three-second claim as a myth and reports longer memory durations.

Qualifications

• No exact span can be pinned down, because some memories are more notable to a fish than others.

  From Do goldfish really have a 3-second memory? Read 2026-09-19 Relevance MODERATE Steps 1 Counted

  Retention varies by task, so no single number replaces the three seconds.

• The source says no exact goldfish memory span can be pinned down because memories differ in notability.

  From Do goldfish really have a 3-second memory? Read 2026-09-19 Relevance DIRECT Steps 0 Counted

  The exact duration is not fixed by the cited evidence.

Suppressed as dependent

Evidence	Group	Kept instead
af4c4aa2		03b71e4f
87a6b150		510f6ae2
737c5bc7		03b71e4f
bf4804b3		03b71e4f

Inferences

Concluded from

None.

Used as a premise in

None.

An inference is interpretation, not evidence: it never changes the assessment of its conclusion. Each premise is a claim with its own evidence.

Threads

None. Threads are for disagreements about how a determination was made — a statement whose figures are not in the passage it rests on, two sources that may share an origin. Something about the world belongs in the evidence above.

Claim edges

None. Edges are stored and displayed; v0.1 does not propagate probability across them.

Review checklist

Review checks: 2 of 4

Check	Done	By
qualifiers reviewed	yes	fe4c2de3
opposing search done	yes	d4de6433
independence reviewed	no
primary source reviewed	no

Summary

Contribution history

seq	event	detail
456	APPENDED
457	ACCEPT	AUTOMATIC_AFTER_VALIDATION
482	LINK_EVIDENCE	by d473d57f (accepted)
484	LINK_EVIDENCE	by d473d57f (accepted)
486	LINK_EVIDENCE	by d473d57f (accepted)
8360	TASK_RESULT	by 1efd24fe (accepted)
9104	TASK_RESULT	by 1efd24fe (accepted)
11300	LINK_EVIDENCE	by 1efd24fe (accepted)