The average range of visual attention for isolated letters lies between 4 and 5 letters (4.82), with only slight individual differences¶
Claim · All claims
Evidence · 1 study · causalr1·q2
Currency · newest study 1910 · not yet checked against its sources · not reviewed by a person
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.
q2 i? Adult observers grasp on average between 4 and 5 isolated letters in a single 0.08-sec exposure, in accord with previous tachistoscopic work. → Whipple 1910
Evidence¶
Whipple 1910¶
Whipple, G. M. (1910). The effect of practise upon the range of visual attention and of visual apprehension. The Journal of Educational Psychology. https://books.google.com/books?q=Whipple+effect+of+practise+range+of+visual+attention+apprehension
q2 · i? · causal · r1
Tachistoscope experiment with six college students exposed to 5-, 6- and 7-place letter series for about 0.08 sec; scoring credited one unit per correct letter. The article reports the average "lies between 4 and 5 (4.82)".
"the average number of letters that can be grasped in a single exposure lies between 4 and 5 (4.82)—a result in close accord with previous tachistoscopic work."
Discussion¶
Related Claims¶
- Longer exposures barely increase apprehension of nonsense material and objects, but materially increase perception of quickly assimilable sense-material such as poetry — related
- Longer letter series yield somewhat higher average scores because they offer opportunities for occasional high scores via mental grouping — related
- Individual differences in quick visual apprehension are striking and material-specific, negating the notion of a general ability to apprehend visually — related
- Practise has a very slight effect on the range of attention, explicable by habituation and grouping tricks rather than any expansion of the range itself — related
- Systematic practise gives little warrant for markedly improving adults' quick visual perception; the slight poetry gain is attributed to familiarity with the poem — related
Page metadata
| Field | Value |
|---|---|
type |
claim |
id |
range-of-attention-4-to-5-letters |
title |
The average range of visual attention for isolated letters lies between 4 and 5 letters (4.82), with only slight individual differences |
description |
The average range of visual attention for isolated letters lies between 4 and 5 letters (4.82), with only slight individual differences |
status |
review |
evidence_strength |
moderate |
newest_evidence |
1910 |
generated |
by process:wiki-ingest on 2026-10-24 |
trust |
unverified — no one has confirmed this page's content |
sources |
1 — whipple-1910 |
Frontmatter is the page's machine-readable record — see the Schema & Guide.