Letter fluency shows no age-group difference in ANOVA, but older adults outperform young adults once processing speed and IQ are controlled¶
Claim · All claims
Evidence · 1 study · associationalr2·q3
Currency · newest study 2011 · not yet checked against its sources · not reviewed by a person · overdue for a recheck since 2016: baselines and conditions change
Subclaims¶
Reading the evidence codes
q is the design tier, i the impact, n the sample, and the kind with its r
the rigour judged within that kind: what each code means.
This claim: no standardized effect is recorded in observations/ for it yet, so no benchmark reading is possible.
q3 i? Initially age had no effect on letter fluency; significant between-group differences appeared only in the ANCOVA model controlling for processing speed and full-scale IQ, with older adults performing slightly better than younger adults. → Safa A. Elgamal 2011
Evidence¶
Safa A. Elgamal 2011¶
Safa A. Elgamal, MBBCh, PhD, Eric A. Roy, PhD, Michael T. Sharratt, PhD. (2011). Age and Verbal Fluency: The Mediating Effect of Speed of Processing. Canadian Geriatrics Journal, Volume 14, Issue 3. https://doi.org/10.5770/cgj.v14i3.17
q3 · i? · associational · r2
Univariate ANCOVA on letter fluency (COWAT F-A-S) controlling for the processing speed composite and NART-estimated IQ in the same 130-participant sample. The discussion states "The change in letter fluency as a function of age appeared only after accounting for processing speed," with the between-group effect significant at p = .04 in the MANCOVA model.
"Initially age had no effect on letter fluency. The change in letter fluency as a function of age appeared only after accounting for processing speed."
Discussion¶
Related Claims¶
- Age correlates negatively with processing speed and category fluency and positively with IQ, but not with letter fluency — related
- Young adults outperform older adults on category fluency and processing speed, while older adults outperform young adults on premorbid IQ (NART) — related
- Curve estimation shows linear decline in processing speed after age 30, quadratic trajectories for category fluency and IQ, and no age change in letter fluency — related
- Processing speed has a significant effect on both letter and category fluency in older adults, while IQ does not — reports the opposite
- When relevant knowledge can be drawn upon, age trends in performance can reverse, with older adults outperforming younger adults on crossword puzzles — related
- Decline in letter fluency beyond normal age expectations warrants further evaluation for neurological or mental disorder — reports the opposite
Page metadata
| Field | Value |
|---|---|
type |
claim |
id |
letter-fluency-age-advantage-emerges-after-speed-control |
title |
Letter fluency shows no age-group difference in ANOVA, but older adults outperform young adults once processing speed and IQ are controlled |
description |
Letter fluency shows no age-group difference in ANOVA, but older adults outperform young adults once processing speed and IQ are controlled |
status |
review |
evidence_strength |
moderate |
newest_evidence |
2011 |
recheck_by |
2016 |
generated |
by process:wiki-ingest on 2026-10-17 |
trust |
unverified — no one has confirmed this page's content |
sources |
1 — safa-a-elgamal-2011 |
Frontmatter is the page's machine-readable record — see the Schema & Guide.