BWhat changed
Immediate numerical apprehension became experimentally measurable.
Scientific scope
Jevons's 1871 article, not later subitizing theory or working-memory claims.
Evidence
The linked sources identify this contribution and its scope. WRS has not independently reconstructed the scientific claims. The record is Jevons’s exact 1871 Nature article. Contemporary replies, later subitizing terminology, modern psychophysical models and broader working-memory claims remain separate.
Contributors
- William Stanley Jevons · SCIENCE: Named source author of the scoped work; individual effort shares are not measured.
Provisional WRS assessment, edition 2026-10-16.1. Independent expert calibration is pending. This grade does not certify correctness or assign ownership.
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