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A lengthy history of research in the crisis communication literature has documented sex differences in information needs and responses. Response Styles Theory is introduced as a potential explanatory mechanism for these findings, which may be attributable to differences in rumination tendency. A representative survey of over 5000 U.S. residents explored information seeking and risk perceptions regarding the COVID-19 pandemic. Results support the argument that previously observed sex differences may be accounted for by rumination, and that rumination is predictive of specific (but not general) risk estimation. Rumination may also drive information seeking and subsequent depressive symptoms, especially among men. The findings are discussed in terms of their implications for risk and crisis communicators, and our consideration of gender norms and their impact on risk message processing. 

Relative brain size has long been considered a reflection of cognitive capacities and has played a fundamental role in developing core theories in the life sciences. Yet, the notion that relative brain size validly represents selection on brain size relies on the untested assumptions that brain-body allometry is restrained to a stable scaling relationship across species and that any deviation from this slope is due to selection on brain size. Using the largest fossil and extant dataset yet assembled, we find that shifts in allometric slope underpin major transitions in mammalian evolution and are often primarily characterized by marked changes in body size. Our results reveal that the largest-brained mammals achieved large relative brain sizes by highly divergent paths. These findings prompt a reevaluation of the traditional paradigm of relative brain size and open new opportunities to improve our understanding of the genetic and developmental mechanisms that influence brain size.