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Aims: Fertility is an important factor for population growth and its proportion. Regarding the overall decrease in the total fertility rate in Iran and reaching below the replacement rate, this study aimed at determining the effect of the education based on the Theory of Planned Behavior (TPB) on women’s fertility intention. Methods & Materials: This interventional study was conducted on 100 pregnant women of reproductive age covered by the Gonabad community health centers. The subjects were selected through two-stage cluster sampling and randomly assigned to the control and experimental groups (n=50 per group). Data were analyzed using SPSS V. 20 and Independent t-test, paired t-test, and Chi-square test. Findings: There was no significant difference between the demographic characteristics of the subjects in the experimental and control groups. Before the intervention, there was no significant difference between the mean score of the theoretical constructs between the two groups. After the intervention, the mean score of attitude (P=0.014), perceived behavioral control (P=0.042), and behavioral intention (P=0.005) were significantly different between the two groups. Conclusion: The results showed that the educational intervention based on TPB could positively affect the fertility intention of single-child women. Hence, it is suggested to use this model in educational programs related to population growth policy and to plan interventions encouraging couples to have another child.

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Using a computational model of cultural evolution in which neural network based agents evolve ideas for actions through invention and imitation, we tested the hypothesis that this is due to the capacity for recursive recall. We compared runs in which agents were limited to single-step actions to runs in which they used recursive recall to chain simple actions into complex ones. Chaining resulted in higher cultural diversity, open-ended generation of novelty, and no ceiling on the mean fitness of actions. Both chaining and no-chaining runs exhibited convergence on optimal actions, but without chaining this set was static while with chaining it was ever-changing. Chaining increased the ability to capitalize on the capacity for learning. These findings show that the recursive recall hypothesis provides a computationally plausible explanation of why humans alone have evolved the cultural means to transform this planet.