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the claim
Counting backwards by threes from one hundred measures working memory and attention in psychological tests
the verdict
COMMON KNOWLEDGE
no citation needed for this one
refutedsupported
the weight of evidence
no sources on either side

Counting backwards by threes (serial subtractions) is a standard cognitive task used to assess working memory, attention, and mental processing speed in clinical and psychological testing; no formal citation is needed for this basic definition.

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The analysis

The claim describes a standard, widely understood cognitive test procedure (serial sevens or serial threes subtraction) used in mental status examinations and psychological tests to evaluate attention and working memory. Because this is a matter of common procedural definition in clinical and psychological practice rather than a contestable empirical discovery, it falls under COMMON_KNOWLEDGE.

Everything we examined (12)
We also searched for evidence AGAINST this claim, not only for it.
  1. International consensus statement on allergy and rhinology: Olfaction.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  2. Loss of gait control assessed by cognitive-motor dual-tasks: pros and cons in detecting people at risk of developing Alzheimer's and Parkinson's diseases.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  3. Effects of Polyphenol-Rich Interventions on Cognition and Brain Health in Healthy Young and Middle-Aged Adults: Systematic Review and Meta-Analysis.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  4. The effects of twenty-one nutrients and phytonutrients on cognitive function: A narrative review.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  5. The Effects of Supplementation with a Vitamin and Mineral Complex with Guaraná Prior to Fasted Exercise on Affect, Exertion, Cognitive Performance, and Substrate Metabolism: A Randomized Controlled Trial.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  6. 9th Trends in Medical Mycology Held on 11-14 October 2019, Nice, France, Organized under the Auspices of EORTC-IDG and ECMM.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  7. Brazilian version of the European Cross-Cultural Neuropsychological Test Battery (CNTB-BR): diagnostic accuracy across schooling levels.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  8. P300 Wave Alterations and Cognitive Impairment in Cerebellum Lesions.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  9. The Search for the Elusive Basic Processes Underlying Human Intelligence: Historical and Contemporary Perspectives.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  10. Cognitive functions explain discrete parameters of normal walking and dual-task walking, but not postural sway in quiet stance among physically active older people.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  11. Distinct neural bases of subcomponents of the attentional blink.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  12. The Effects of Mind-Wandering, Cognitive Load and Task Engagement on Working Memory Performance in Remote Online Experimentspeer-reviewedno side takennot shown: read and judged not to bear on this claim
The paper trail · every fact has a biography
first checked05 Aug 2026
judged → COMMON KNOWLEDGE · 9505 Aug 2026
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