Abstract
In evolutionary psychology, it is customary to measure life-history via psychometric inventories such as the Arizona Life History Battery (ALHB). The validity of this approach has been questioned: it is argued that these measures are not congruent with biological life history events, such as the number of children, age at first birth, or pubertal timing. However, empirical data to test this critique are lacking. We therefore administered the ALHB to a convenience sample of young adults in Serbia (N = 447). We also collected information on psychosocial-biodemographic life history parameters closely related to biological life history traits: pubertal timing, onset of sexual behavior, short- and long-term mating, number of children, timing of reproduction, parenthood values, and environmental harshness. We found that correlations between these two sets of measures were rare, unsystematic, and mostly low in magnitude. Stable patterns of relations emerged only between the indicators of environmental conditions from both sets of measures. Furthermore, some ALHB indicators were found to be positively related with early fertility, which is incongruent with the conceptual foundation of ALHB. Finally, network analysis and factor analysis within each set of measures revealed different structures and that the hypothesis of unidimensionality, on which the ALHB was founded, cannot be applied to psychosocial-biodemographic life history indicators. Our results support the critique of ALHB as a set of measures lacking validity to capture biodemographic life-history parameters. ALHB measures are indeed relevant for understanding life-history variation, but they cannot be used as a substitute for specific life history characteristics. Our findings are a warning to researchers to use direct measures of biological events in order to measure life-history dynamics.
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Other potentially important results are shown in the Electronic Supplementary Material: (1) additional descriptive information on psychosocial-biodemographic life history indicators; (2) correlations (both Pearson’s and Spearman’s coefficients) between and within two sets of life history indicators obtained on raw measures (before normalization); (3) regression function with reproductive success as a criterion measure and all life history indicators as predictor variables; (4) differences between individuals with and without children on all other examined variables; (5) loadings of the variables on the canonical factors in Canonical Correlation Analysis; (6) more detailed information regarding the centrality indices of the nodes in network model; and (7) networks models with all life history indicators estimated for males and females separately.
Perhaps we can be even more precise here. Reproductive success and survival/longevity are considered the two most crucial fitness components. However, with the substantial improvement in medical care and standard of life in general in many contemporary human populations, the selection on survival/longevity is quite weak. Since early-age mortality is low, most individuals live to their reproductive period and beyond. Consequently, this leaves only reproductive output as a major aspect of fitness—the one through which selection operates. Of course, the role of survival/longevity is contingent on environmental conditions—in harsh and hostile environments, the selection on survival/longevity is stronger. However, for most contemporary human populations, reproductive fitness is probably the main driver of biological evolution.
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The work on this manuscript was financed by the Serbian Ministry of Education, Science and Technological Development in the project 47011, realized by the Institute of Criminological and Sociological Research.
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Međedović, J. On the Incongruence between Psychometric and Psychosocial-Biodemographic Measures of Life History. Hum Nat 31, 341–360 (2020). https://doi.org/10.1007/s12110-020-09377-2
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DOI: https://doi.org/10.1007/s12110-020-09377-2