During the final fatigue test, time per problem rose gradually, then markedly, with no obvious correlation between time and accuracy¶

Claim · All claims
Evidence · 1 study · causal r1 · q1
Currency · newest study 1914 · not yet checked against its sources · not reviewed by a person

Subclaims¶

q1 i? Time per problem showed a gradual rise, a relatively steady middle period, and a marked rise at the end, with no obvious correlation between time and accuracy scores. → W. S. Painter 1914

Evidence¶

W. S. Painter 1914¶

W. S. Painter. (1914). Efficiency in Mental Multiplication Under Extreme Fatigue. The Journal of Educational Psychology. https://psycnet.apa.org/journals/edu/

q1 · i? · causal · r1

Final-test record (Table II) of 28 four-place by five-place problems solved between 11:00 P.M. and 3:07+ A.M., with times in seconds and wrong figures per answer. The text reports "a gradual rise in time per problem from the first to the eighth, a relatively steady period from the 11th to the 18th problem and a marked rise" afterward.

"There appears to be no obvious correlation between the time and the accuracy scores."

Discussion¶

Related Claims¶

• Under extreme fatigue, mental multiplication efficiency ends at a definite, relatively abruptly appearing point rather than tailing off by degrees — related
• Late-afternoon memory work shows relative inefficiency of about 5-6 per cent compared with early-morning work in 13-year-old boys — related
• Improvement by practice continues in both morning and afternoon groups, but the morning group improves faster across weeks — related
• In one class of 13-year-old boys, memory scores were kept to a steady rank order by repeated practice (successive tests correlating +.87 to +.90) before fatigue testing began — related
• Test-retest correlations of memory span are low, questioning the validity of a single memory span test — related
• Psychological methods of fatigue measurement afford useful average values and reliable information about the course and effect of fatigue (Offner) — a broader claim this one bears on
• When four-place by four-place mental multiplication came to a standstill under extreme fatigue, ability to multiply any numbers was also lost — related