Changes in Word Usage Frequency May Hamper Intergenerational Comparisons of Vocabulary Skills

Abstract

Research on secular trends in mean intelligence test scores shows smaller gains in vocabulary skills than in nonverbal reasoning. One possible explanation is that vocabulary test items become outdated faster compared to nonverbal tasks. The history of the usage frequency of the words on five popular vocabulary tests, the GSS Wordsum, Wechsler Adult Intelligence Scale (WAIS), Wechsler Adult Intelligence Scale–Revised (WAIS-R), Wechsler Intelligence Scale for Children (WISC), and Wechsler Intelligence Scale for Children–Revised (WISC-R) IQ tests, was analyzed by means of the Google ngram viewer. Usage frequency had a 0.38 to 0.73 correlation with item difficulty. In the period between test standardizations, the median change in usage frequency was −17% for WISC words, −8% for Wordsum, −5% for WISC-R, −4% for WAIS, and 0% for WAIS-R words. The correlation between median change in usage frequency and gain in vocabulary score was 0.33. Further studies with a larger set of vocabulary tests are needed to analyze in more detail the magnitude of the effect of changing word usage frequencies.

Keywords

vocabulary test ngram analysis Flynn effect

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References

Alwin

D. F.

Pacheco

(2012). Population trends in verbal intelligence in the United States. In Marsden

P. W.

(Ed.), Social trends in American life. Findings from the General Social Survey since 1972 (pp. 340-363). New Jersey, NJ: Princeton University press.

Brysbaert

Keuleers

New

(2011). Assessing the usefulness of Google Books’ word frequencies for psycholinguistic research on word processing. Frontiers in Psychology, 2, 27.

Curzan

(2009). Historical corpus linguistics and evidence of language change. In Luedeling

Kytö

(Eds.), Corpus linguistics (pp 1091-1108). Berlin, Germany: Gruyter.

Flynn

J. R.

(2010). Problems with IQ gains: The huge vocabulary gap. Journal of Psychoeducational Assessment, 28, 412-433.

Flynn

J. R.

(2012). Are we getting smarter. Rising IQ in the 21st century. Cambridge, UK: Cambridge University Press.

GSS (General Social Survey). (2009). Cumulative file for wordsum 1972-2006. Chicago, IL: National Opinion Research Center.

Hauser

Huang

M. H.

(1997). Verbal ability and socioeconomic success. Social Science Research, 26, 331-376.

Kucera

Francis

W. N.

(1967). Computational analysis of present-day American English. Providence, RI: Brown University press.

Lynn

(2009). Fluid intelligence, but not vocabulary has increased in Britain, 1979–2008. Intelligence, 37, 249-255.

10.

Michel

J.B.

Shen

Y. K.

Aiden

A. P.

Veres

Gray

M. K.

, The Google Books Team, . . . Aiden

E. L.

(2011). Quantitative analysis of culture using millions of digitized books. Science, 331, 176-182.

11.

Sundet

J. M.

Barlaug

D. G.

Torjussen

T. M.

(2004). The end of the Flynn effect? A study of secular trends in mean intelligence test scores of Norwegian conscripts during half a century. Intelligence, 32, 349-362.

12.

Wechsler

(1949). Wechsler intelligence scale for children. New York, NY: Psychological Corporation.

13.

Wechsler

(1955). Wechsler adult intelligence scale: Manual. New York, NY: Psychological Corporation.

14.

Wechsler

(1974). Manual for the Wechsler Intelligence Scale for Children—Revised. New York: Psychological Corporation.

15.

Wechsler

(1981). Wechsler adult intelligence scale–Revised: Manual. New York, NY: Psychological Corporation.

16.

Wechsler

(1991). The Wechsler intelligence scale for children—Third edition. San Antonio, TX: Psychological Corporation.

17.

Wechsler

(1997). Wechsler adult intelligence scale–Third edition: Manual. San Antonio, TX: Psychological Corporation.