![]() ![]() Based on these observations, we offer the following conclusions. Fourth, cross-sectional comparisons among competing models of ABC associations cannot disambiguate competing hypotheses about the structure and the range of directed and reciprocal relations between changes in brain and behavior. Third, variances and correlations among measures of brain and cognition frequently vary with age. Second, age differences and age changes in brain and cognition are often nonlinear. ![]() First, there is enough disparity among the measures of brain structure and cognitive performance to question the uniformity of B and C vertices of the ABC triangle. His review, however, misses several important points. Salthouse (2011) critically reviewed cross-sectional and longitudinal relations among adult age, brain structure, and cognition (ABC), and identified problems in interpretation of the extant literature. ![]()
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