Reproducibility of [F]MK-6240 kinetics in brain studies with shortened dynamic PET protocol in healthy/cognitively normal subjects.

Background: [F]MK-6240 is a neurofibrillary tangles PET radiotracer that has been broadly used in aging and Alzheimer's disease (AD) studies. Majority of [F]MK-6240 PET studies use dynamic acquisitions longer than 60 min to assess the tracer kinetic parameters. As of today, no consensus has been established on the optimum dynamic PET scan time.

Stereotypes shape response competition when forming impressions.

Dynamic models of impression formation posit that bottom-up factors (e.g., a target's facial features) and top-down factors (e.

Everyday Perceiver-Context Influences on Impression Formation: No Evidence of Consistent Effects.

Facial impressions (e.g., trustworthy, intelligent) vary considerably across different perceivers and targets.

Facial Impressions Are Predicted by the Structure of Group Stereotypes.

Impressions of other people's faces (e.g., trustworthiness) have long been thought to be evoked by morphological variation (e.

Little Between-Region and Between-Country Variance When People Form Impressions of Others.

To what extent are perceivers' first impressions of other individuals dictated by cultural background rather than personal idiosyncrasies? To address this question, we analyzed a globally diverse data set containing 11,481 adult participants' ratings of 120 targets across 45 countries (2,597,624 total ratings). Across ratings of 13 traits, we found that perceivers' idiosyncratic differences accounted for approximately 29% of variance and impressions on their own and approximately 16% in conjunction with target characteristics. However, country- and region-level differences, here a proxy for culture, accounted for 3.

To which world regions does the valence-dominance model of social perception apply?

Over the past 10 years, Oosterhof and Todorov's valence-dominance model has emerged as the most prominent account of how people evaluate faces on social dimensions. In this model, two dimensions (valence and dominance) underpin social judgements of faces. Because this model has primarily been developed and tested in Western regions, it is unclear whether these findings apply to other regions.

Perceiver and target characteristics contribute to impression formation differently across race and gender.

Social impressions arise from characteristics of both perceivers and targets. However, empirical research in the domain of impression formation has yet to quantify the extent to which perceiver and target characteristics uniquely contribute to impressions across group boundaries (e.g.