Widespread associations between trait conscientiousness and thickness of brain cortical regions

Widespread associations between trait conscientiousness and thickness of brain cortical regions. Gary J. Lewis et al. NeuroImage, https://doi.org/10.1016/j.neuroimage.2018.04.033

Highlights
•    We investigated relationships between personality and neuroanatomy.
•    Participants (N = 578) completed an MRI scan and Big Five personality trait measures.
•    Conscientiousness was positively related to cortical thickness in a range of regions.
•    These included: parahippocampal, fusiform, and cingulate gyri, and frontal cortex.
•    No other Big Five trait was associated with our brain measures.

Abstract: The neural correlates of human personality have been of longstanding interest; however, most studies in the field have relied on modest sample sizes and few replicable results have been reported to date. We investigated relationships between personality and brain gray matter in a sample of generally healthy, older (mean age 73 years) adults from Scotland drawn from the Lothian Birth Cohort 1936. Participants (N = 578) completed a brain MRI scan and self-reported Big Five personality trait measures. Conscientiousness trait scores were positively related to brain cortical thickness in a range of regions, including bilateral parahippocampal gyrus, bilateral fusiform gyrus, left cingulate gyrus, right medial orbitofrontal cortex, and left dorsomedial prefrontal cortex. These associations – most notably in frontal regions – were modestly-to-moderately attenuated by the inclusion of biomarker variables assessing allostatic load and smoking status. None of the other personality traits showed robust associations with brain cortical thickness, nor did we observe any personality trait associations with cortical surface area and gray matter volume. These findings indicate that brain cortical thickness is associated with conscientiousness, perhaps partly accounted for by allostatic load and smoking status.

Keywords: Personality; Conscientiousness; Cortical thickness; Brain; Neuroanatomy; Allostatic load

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Political conservatism is negatively associated with an individual’s rating of sociology as being scientific; and is more negative among those with more education

Politics and the Perceived Boundaries of Science: Activism, Sociology, and Scientific Legitimacy. Christopher P. Scheitle. Socius: Sociological Research for a Dynamic World. http://journals.sagepub.com/doi/full/10.1177/2378023118769544

Abstract: Research has suggested that public confidence in the scientific community has become politicized, but it is not clear that liberals and conservatives disagree on the more fundamental question of what counts as being scientific. An analysis of General Social Survey data finds that political conservatism is negatively associated with an individual’s rating of sociology as being scientific. This association is not found when examining ratings of economics or biology. Education moderates this association, as the gap between liberals’ and conservatives’ ratings of sociology’s scientific-ness is greater among those with more education. Although research has demonstrated that trust in the scientific community has become politicized, these findings demonstrate that the perceived boundaries of science can also be influenced by political ideology.

Keywords: science, sociology, politics, conservatism, liberalism

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