A Neuroimaging Study of Personality Traits and Self-Reflection

Lay epistemology and the Populist's playbook: The roles of epistemological identity and expressive epistemology

Salient social identities have long appeared to shape what we believe and know. But do social identities also shape how we know? This essay argues that performances of "lay epistemology" by populist leaders may shape group norms in ways that encourage supporters to orient to their worlds more through intuition and emotion and less through evidence and data (or at least to report that they do, thus constituting a form of "expressive epistemology"). We summarize research on the positive link between populist attitudes, valuing intuition and emotion over evidence and data, and belief in misinformation and conspiracy theories, and then explore how these relationships may be mutually reinforcing - and strategically beneficial to populist leaders.

The effect of the preferred hand on drawing movement

The observation that different effectors can execute the same movement suggests functional equivalences driven by limb independent representation of action in the central nervous system. A common invariant motor behavior is the speed and curvature coupling (the 1/3 power law), a low dimensional (abstract) descriptor of movement which is resilient to different sensorimotor contexts. Our purpose is to verify the consistency of such motor equivalence during a drawing task, by testing the effect of manual dominance and movement speed on motor performance. We hypothesize that abstract kinematic variables are not the most resistant to speed or limb effector changes. The results show specific effects of speed and hand side on the drawing task. Movement duration, speed-curvature covariation, and maximum velocity were not significantly affected by hand side, while geometrical features were strongly speed and limb dependent. However, intra-trial analysis performed over the successive drawing movements reveals a significant hand side effect on the variability of movement vigor and velocity-curvature relationship (the 1/3 PL). The identified effects of speed and hand dominance on the kinematic parameters suggest different neural strategies, in a pattern that does not go from the most abstract to the least abstract component, as proposed by the traditional hierarchical organization of the motor plan.