Functions, operations, and decalage in the development of transitivity.

The hypothesis that some attempts to reduce the performance demands of concrete operational tasks may have allowed children to solve those tasks with preoperational functions was tested by administering two previously used versions of the transitivity task for length and weight to 120 children 6 to 9 years of age. In the standard Piagetian version of the task, comparison objects were presented only two at a time, with no correlation between length or weight, but placed too far apart for differences to be seen. As predicted: (a) the standard version was solvable only through an operational composition of premise relations, but the alternate version allowed children to recode length or weight as a function of spatial position; (b) the functional solution was easier and developed at an earlier age than the operational solution for length as for weight. In addition, the decalage between length and weight was found to result from children's tendency to infer weight as a function of size rather than from an operational composition of premise relations. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Schema reliance for developmental goals increases from early to late adulthood: Improvement for the young, loss prevention for the old.

People tend to encode and retrieve information in terms of schemata, especially when processing resources are low. This study argues that the life-span schema about developmental goals constitutes a generalized expectation about the life course that associates young adults with growth and older adults with loss prevention. Predictions were that young and older adults possess this schema; that both age groups rely on it when remembering age-associated information about goals; and that this schema reliance is particularly pronounced among older adults, due to age-related difficulties in overcoming schemata. In Experiment 1, participants assigned growth or loss-prevention orientations to young and older faces and adhered to the life-span schema. In Experiment 2, participants were presented young and older faces paired with growth or loss prevention. When later asked to recognize faces and remember goal orientations, participants were more likely to remember young faces with growth and older faces with loss prevention than vice versa. This effect was more pronounced among older adults. Conclusions are that reliance on life-span schemata when remembering developmentally relevant information increases with age. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Cross-sectional age variance extraction: What's change got to do with it?

In cross-sectional age variance extraction (CAVE), age, the indicator of a hypothesized developmental mechanism, and a developmental outcome are specified as independent, mediator, and target variables, respectively, to test hypotheses about behavioral development. We show that: (a) longitudinal change in a mediator variable accounting for substantial cross-sectional age-related variance in the target variable need not correlate with the target variable's longitudinal change; and, conversely, (b) longitudinal change in a mediator not sharing cross-sectional age-related variance with the target variable may nevertheless correlate highly with that variable's longitudinal change. We discourage use of CAVE for testing multivariate hypotheses about behavioral development. (PsycINFO Database Record (c) 2011 APA, all rights reserved)     

Social Participation Attenuates Decline in Perceptual Speed in Old and Very Old Age.

Does an engaged and active lifestyle in old age alleviate cognitive decline, does high cognitive functioning in old age increase the possibility of maintaining an engaged and active lifestyle, or both? The authors approach this conundrum by applying a structural equation model for testing dynamic hypotheses, the dual change score model (J. J. McArdle & F. Hamagami, 2001), to 3-occasion longitudinal data from the Berlin Aging Study (Time 1: n = 516, age range = 70-103 years). Results reveal that within a bivariate system of perceptual speed and social participation, with age and sociobiographical status as covariates, prior scores of social participation influence subsequent changes in perceptual speed, while the opposite does not hold. Results support the hypothesis that an engaged and active lifestyle in old and very old age may alleviate decline in perceptual speed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Highly parallel, fast scaling of numbers in nonredundant residuearithmetic

A new approach to scaling in the nonredundant residue number system (RNS) with the use of the Chinese remainder theorem (CRT) is presented. The auxiliary scaling by M, where M is the number range, is performed in parallel with scaling by the scale factor K in order to avoid the number range overflow. The scaler design utilizes small look-up tables and multioperand (both modulo and binary) adders. The new approach does not impose restrictions on the form, size, and number of moduli n. The only proviso is that K>n. The scaling error is bounded by n and can be reduced to 1 or 1.5 if a correction circuit is employed. Hardware complexity expressed by the number of transistors is approximately one order smaller than that for the earlier design, whereas the scaler latency is similar     

Embryonal carcinoma in a 16-year patient

The authors present diagnostic and therapeutic documentation of a very rare case of a tumour with carcinoma embryonal in a 16-year old girl. After the surgery (total hysterectomy and adnexectomy) followed by chemotherapy, the patient survived four years.     

Well-being affects changes in perceptual speed in advanced old age: Longitudinal evidence for a dynamic link.

This study examined competing hypotheses about dynamic cross-domain associations between perceptual speed and well-being in advanced old age. We applied the bivariate dual change score model (J. J. McArdle & F. Hamagami, 2001) to 13-year incomplete longitudinal data from the Berlin Aging Study (P. B. Baltes & K. U. Mayer, 1999; N = 516, 70-103 years at T1, M = 85 years). Reports of well-being were found to influence subsequent decline in perceptual speed (time lags of 2 years). No evidence was found for a directed effect in the other direction. None of the potential covariates examined (initial health constraints, personality, and social participation) accounted for these differential lead-lag associations. Our results suggest that well-being is not only a consequence of but also a source for successful aging. The discussion focuses on conceptual implications and methodological considerations. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Cognitive and sensory declines in old age: Gauging the evidence for a common cause.

Resource accounts of behavioral aging postulate that age-associated impairments within and across intellectual and sensory domains reflect, in part, a common set of senescent alterations in the neurochemistry and neuroanatomy of the aging brain. Hence, these accounts predict sizeable correlations of between-person differences in rates of decline, both within and across intellectual and sensory domains. The authors examined reliability-adjusted variances and covariances in longitudinal change for 8 cognitive measures and for close visual acuity, distant visual acuity, and hearing in 516 participants in the Berlin Aging Study (ages 70 to 103 years at 1st measurement). Up to 6 longitudinal measurements were distributed over up to 13 years. Individual differences in rates of cognitive decline were highly correlated, with a single factor accounting for 60% of the variance in cognitive change. This amount increased to 65% when controlling for age at first measurement, distance to death, and risk of dementia. Contrary to expectations, the correlations between cognitive and sensory declines were only moderate in size, underscoring the need to delineate both domain-general and function-specific mechanisms of behavioral senescence. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

On the relation of mean reaction time and intraindividual reaction time variability.

Researchers often statistically control for means when examining individual or age-associated differences in variances, assuming that the relation between the 2 is linear and invariant within and across individuals and age groups. We tested this assumption in the domain of working memory by applying variance-heterogeneity multilevel models to reaction times in the n-back task. Data are from the COGITO study, which comprises 101 younger and 103 older adults assessed in over 100 daily sessions. We found that relations between means and variances vary reliably across age groups and individuals, thereby contradicting the invariant linearity assumption. We argue that statistical control approaches need to be replaced by theoretical models that simultaneously estimate central tendency and dispersion of latencies and accuracies and illustrate this claim by applying the diffusion model to the same data. Finally, we note that differences in reliability between estimates for means and variances need to be considered when comparing their unique contributions to developmental outcomes. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Life satisfaction shows terminal decline in old age: Longitudinal evidence from the German Socio-Economic Panel Study (SOEP).

Longitudinal data spanning 22 years, obtained from deceased participants of the German Socio-Economic Panel Study (SOEP; N = 1,637; 70- to 100-year-olds), were used to examine if and how life satisfaction exhibits terminal decline at the end of life. Changes in life satisfaction were more strongly associated with distance to death than with distance from birth (chronological age). Multiphase growth models were used to identify a transition point about 4 years prior to death where the prototypical rate of decline in life satisfaction tripled from -0.64 to -1.94 T-score units per year. Further individual-level analyses suggest that individuals dying at older ages spend more years in the terminal periods of life satisfaction decline than individuals dying at earlier ages. Overall, the evidence suggests that late-life changes in aspects of well-being are driven by mortality-related mechanisms and characterized by terminal decline. (PsycINFO Database Record (c) 2010 APA, all rights reserved)