Eye Gaze and Head Posture Jointly Influence Judgments of Dominance, Physical Strength, and Anger

Social status hierarchies are a universal principle of organization in human societies. Status judgments are often influenced by perceptions of the face and posture. Two important nonverbal cues of social status are head postures and eye gaze. Prior research has shown contradictory results and little is known about the interaction of these two cues. Study 1 investigated how eye gaze (direct vs. averted) and head postures (bowed vs. neutral vs. raised) impact judgments of dominance and physical strength. Judgments of dominance were influenced more than judgments of physical strength. Furthermore, raised heads implied dominance and strength, but in contrast to common assumptions, a bowed head conveyed dominance if the eyes gazed at the observer. Study 2 showed that bowed heads with direct gaze conveyed anger, potentially explaining the increased judgments of dominance. Taken together, the results show that head posture and gaze interactively modulated status-related traits and emotions, namely, dominance, strength, and anger, and help clarify prior incompatible findings on head postures and eye gaze. This is a pre-print of an article published in Journal of Nonverbal Behavior. The final authenticated version is available online at: https://doi.org/10.1007/s10919-018-0276-

Acidithiobacillus ferrivorans SS3 presents little RNA transcript response related to cold stress during growth at 8 A degrees C suggesting it is a eurypsychrophile

Acidithiobacillus ferrivorans is an acidophilic bacterium that represents a substantial proportion of the microbial community in a low temperature mining waste stream. Due to its ability to grow at temperatures below 15 °C, it has previously been classified as ‘psychrotolerant’. Low temperature-adapted microorganisms have strategies to grow at cold temperatures such as the production of cold acclimation proteins, DEAD/DEAH box helicases, and compatible solutes plus increasing their cellular membrane fluidity. However, little is known about At. ferrivorans adaptation strategies employed during culture at its temperature extremes. In this study, we report the transcriptomic response of At. ferrivorans SS3 to culture at 8 °C compared to 20 °C. Analysis revealed 373 differentially expressed genes of which, the majority were of unknown function. Only few changes in transcript counts of genes previously described to be cold adaptation genes were detected. Instead, cells cultured at cold (8 °C) altered the expression of a wide range of genes ascribed to functions in transcription, translation, and energy production. It is, therefore, suggested that a temperature of 8 °C imposed little cold stress on At. ferrivorans, underlining its adaptation to growth in the cold as well as suggesting it should be classified as a ‘eurypsychrophile’