AGE AND INTELLIGENCE ACROSS THE ADULT LIFE SPAN in .NET

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AGE AND INTELLIGENCE ACROSS THE ADULT LIFE SPAN
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90 85 80 75 Longitudinal Cross-sectional 20 25 30 35 40 45 50 Age 55 60 65 70 75
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FIGURE 5.18
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Changes in Wechsler Performance IQ with chronological age using two different experimental designs: cross-sectional (controlling for education) and longitudinal (controlling for instrument and time-lag effects).
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shape of the precise growth curve remains elusive, but longitudinal analysis suggests that the lower P-IQs for successive age groups is not just a cross-sectional phenomenon. Kaufman s (2001) Study of WAIS-R and WAIS-III Samples Kaufman (2001) used Parker s (1986) and Kaufman s (1990) methodology to replicate the WAIS/WAIS-R cohort-substitution study with data from the WAIS-R and WAIS-III standardization samples. He examined changes on the three IQs for seven cohorts over the 17-year span from 1978 to 1995. These cohorts, summarized in Table 5.13, range from individuals born between 1954 and 1958 (tested at age 22 and again at 39) to adults born between 1904 and 1908, who were 72 during the WAIS-R standardization and 89 when the WAIS-III was normed. Kaufman (2001) demonstrated that the pairs of independent samples within each of the seven
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cohorts matched adequately on the variables of gender, geographic region, educational attainment, and race/ethnicity. The key difference between the instruments, apart from the 17 years between standardizations, is the substitution of Matrix Reasoning for Object Assembly for computing P-IQ and FS-IQ. However, WAIS-R and WAIS-III P-IQs correlated .86 and the FS-IQs correlated .93 in a counterbalanced study of 192 adults, ages 16 74 years, tested twice (Psychological Corporation, 1997, pp. 78 79). These values are comparable to the coefficients of .84 and .92 for the WAIS and WAIS-R Performance and Full Scales, respectively (Ryan, Nowak, & Geisser, 1987), supporting the publisher s claim that the WAIS-III measures essentially the same constructs as does the WAIS-R (Psychological Corporation, 1997, p. 78). To correct for the difference in the IQs yielded by the two instruments, constants of 1.2, 4.8, and 2.9 were added to mean WAIS-III Verbal, Performance, and Full Scale IQs, respectively, to make
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176 PART II INDIVIDUAL DIFFERENCES ON AGE, SOCIOECONOMIC STATUS, AND OTHER KEY VARIABLES TABLE 5.13 The seven adult cohorts represented in the WAIS-R
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and WAIS-III standardization samples Cohort (Year of Birth) 1954 1958 1944 1953 1934 1943 1924 1933 1914 1923 1909 1913 1904 1908 Age in 1978 (WAIS-R Standardization) 22.0 (20 24) 29.5 (25 34) 39.5 (35 44) 49.5 (45 54) 59.5 (55 64) 67.0 (65 69) 72.0 (70 74) Age in 1995 (WAIS-III Standardization) 39.0 (37 41) 46.5 (42 51) 56.5 (52 61) 66.5 (62 71) 76.5 (72 81) 84.0 (82 86) 89.0 (87 91)
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NOTE: Standardization data of the Wechsler Adult Intelligence Scale: Third Edition. Copyright 1997 by The Psychological Corporation. Used by permission. All rights reserved. Reprinted from Kaufman (2001) with permission.
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these IQs comparable to WAIS-R IQs; these constants were derived from IQ differences obtained in the WAIS-R/WAIS-III counterbalanced study (Psychological Corporation, 1997, Table 4.1). For both instruments, all IQs were based on reference group norms (ages 20 34 years) to provide a common yardstick for comparisons from age to age. To control for cultural change or time lag to ensure that any observable changes over the 17-year interval for each cohort are truly due to development and not to other factors, Kaufman (2001) compared the IQs earned by each cohort in 1978 with the IQs earned by adults the same age in 1995. The time lags were smallest for the two youngest cohorts, averaging about 1 point for Verbal IQ, 4.5 points for Performance IQ, and 2.5 points for Full Scale IQ. For the older five cohorts, time lags averaged about 6 to 9 points for each IQ. KEY FINDINGS. Table 5.14 shows the IQ changes from 1978 to 1995 for each of the seven cohorts, adjusted for instrument and time lag, along with effect sizes (based on SD = 15) for each adjusted change. Except for the two youngest cohorts, each cohort lost IQ points on each scale. Effect sizes are small in magnitude for Verbal IQ except for the two oldest cohorts. By con-
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trast, the effect sizes for Performance IQ are moderate, and similar in value, for the five oldest cohorts. Over the 17-year period, adults born before 1944 lost 10 points ( 1) of Performance IQ, or about 2/3 of a SD, whether they were about 60, 70, 80, or 90 years of age in 1995. For the oldest two cohorts, Full Scale IQ losses were larger than either separate loss reflecting the more generalized loss of function in both verbal and nonverbal domains that occurs during the decade of the 80s. IMPLICATIONS OF RESULTS. Kaufman (2001) presented WAIS-III education-adjusted crosssectional analyses, discussed previously, alongside these cohort-substitution analyses, and the similarity in results for these two alternate approaches to IQ and aging is remarkable. In both analyses, Verbal IQ emerged as a maintained ability for most of the life span (peaking at ages 45 54), with the only notably lower mean Verbal IQs occurring for adults in their 80s. Performance IQ was a vulnerable ability in both cross-sectional and longitudinal analyses, with peak performance occurring at ages 20 24. Figure 5.19 graphs the decline in P-IQ during the adult life span for mean IQs obtained cross-sectionally and longitudinally. As was true for the cross-sectional and
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