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3 results for “punctuated equilibria”
Data from: Punctuated equilibria remains the dominant pattern of morphospecies origin in the fossil record: An analysis using the “persistence of ancestor” criterion
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A mechanism for punctuating equilibria during mammalian vocal development
<p>Evolution and development are typically characterized as the outcomes of gradual changes, but sometimes such changes are abrupt: States of equilibrium can be punctuated by sudden change. Here, we studied the early vocal development of three different mammals: common marmoset monkeys, Egyptian fruit bats, and humans. Consistent with the notion of punctuated equilibria, we found that all three species undergo at least one sudden transition in the acoustics of their developing vocalizations. This was expected. To understand the mechanism, we modeled different developmental landscapes. We found that the transition was best described as a shift in the balance of two vocalization landscapes. We show that the natural dynamics of these two landscapes are consistent with the dynamics of energy expenditure and information transmission. By using them as constraints for each species, we predicted the differences in transition timing from immature to mature vocalizations. Using marmoset monkeys, we were able to manipulate both infant energy expenditure (vocalizing in a heliox environment) and information transmission (closed-loop contingent parental vocal playback). These experiments supported our predictions regarding the role of energy and information in leading to punctuating equilibrium states of vocal development.</p>
A mechanism for punctuating equilibria during mammalian vocal development
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