The auroral green line in Perseid spectra near sunspot maximum

Thirty-one spectra photographed during the Perseid showers of 1969 and 1970 are found to exhibit greater ionization and stronger, more frequent appearance of the forbidden oxygen line at 5577 A than Perseid spectra obtained with the same instrument in 1961. Data from 13 Perseid showers indicate a relationship between the frequency of occurrence of the oxygen line and solar activity. In 1969-70, near sunspot maximum, the strength of this auroral green line is greatest near shower maximum, as though the nature of the meteoroids were a function of their distance from the core of the stream, or, alternatively, the strength of the green line were a function of the altitude of the radiant

Leadership in the locker room: How the intensity of leaders' unpleasant affective displays shapes team performance.

Research has documented conflicting evidence about the relationship between a leader's unpleasant affective displays and team performance. Drawing on the dual threshold model of anger, we propose a novel explanation for this paradox such that the positive relationship between leaders' unpleasant affect and team performance turns negative at high levels of intensity. We examined our hypothesis in a multilevel field study of 304 halftime locker room speeches involving 23 high school and college basketball teams and a follow-up experiment. Our results show support for the prediction and suggest that the curvilinear effect of leaders' unpleasant affective displays may be explained by team members' redirection of attention and approach, which is positively associated with team members' effort at moderate levels of leader unpleasantness but leads to lower effort at high and low levels of leader unpleasantness. We discuss the theoretical contributions for scholarship on leadership, emotions as social information theory, and practical implications of the results. (PsycINFO Database Record (c) 2019 APA, all rights reserved)

The involvement of actin, calcium channels and exocytosis proteins in somato-dendritic oxytocin and vasopressin release

Hypothalamic magnocellular neurons release vasopressin and oxytocin not only from their axon terminals into the blood, but also from their somata and dendrites into the extracellular space of the brain, and this can be regulated independently. Differential release of neurotransmitters from different compartments of a single neuron requires subtle regulatory mechanisms. Somato-dendritic, but not axon terminal release can be modulated by changes in intracellular calcium concentration [(Ca(2+))] by release of calcium from intracellular stores, resulting in priming of dendritic pools for activity-dependent release. This review focuses on our current understanding of the mechanisms of priming and the roles of actin remodeling, voltage-operated calcium channels (VOCCs) and SNARE proteins in the regulation somato-dendritic and axon terminal peptide release

Facial expressions in response to a highly surprising event exceeding the field of vision: a test of Darwin's theory of surprise

Copyright © 2012 Elsevier Inc. All rights reserved.According to the affect program theory of facial displays, the evolutionary core of the human emotion system consists of a small set of discrete emotion mechanisms that comprise motor programs for emotion-specific facial displays. However, research on surprise has found that surprising events often fail to elicit the associated facial expression (widened eyes, raised eyebrows, mouth opening). The present study tested a refined Darwinian account of the facial expression of surprise, according to which surprising events cause widened eyes and raised eyebrows if they exceed the field of vision, as these facial changes increase the visual field and facilitate visual search. To test this hypothesis, we staged a surprising event that engulfed the field of vision: When the participants left the laboratory, they unexpectedly found themselves in a new room, a small chamber with bold green walls and a red office chair. In addition, to explore the role of social context for the expression of surprise, in two of three experimental conditions, a stranger or a friend they had brought to the experiment was sitting on the chair. The results provided no support for the Darwinian account of the facial expression of surprise. A complete expression of surprise was observed in 5% of the participants, and the individual components of the expression were shown only by a minority, regardless of social context. These findings reinforce doubts about the adequacy of affect program theory for the case of surprise

The effect of relationship status on communicating emotions through touch

Research into emotional communication to date has largely focused on facial and vocal expressions. In contrast, recent studies by Hertenstein, Keltner, App, Bulleit, and Jaskolka (2006) and Hertenstein, Holmes, McCullough, and Keltner (2009) exploring nonverbal communication of emotion discovered that people could identify anger, disgust, fear, gratitude, happiness, love, sadness and sympathy from the experience of being touched on either the arm or body by a stranger, without seeing the touch. The study showed that strangers were unable to communicate the self-focused emotions embarrassment, envy and pride, or the universal emotion surprise. Literature relating to touch indicates that the interpretation of a tactile experience is significantly influenced by the relationship between the touchers (Coan, Schaefer, & Davidson, 2006). The present study compared the ability of romantic couples and strangers to communicate emotions solely via touch. Results showed that both strangers and romantic couples were able to communicate universal and prosocial emotions, whereas only romantic couples were able to communicate the self-focused emotions envy and pride

Emotional valence and arousal affect reading in an interactive way: neuroimaging evidence for an approach-withdrawal framework

A growing body of literature shows that the emotional content of verbal material affects reading, wherein emotional words are given processing priority compared to neutral words. Human emotions can be conceptualised within a two-dimensional model comprised of emotional valence and arousal (intensity). These variables are at least in part distinct, but recent studies report interactive effects during implicit emotion processing and relate these to stimulus-evoked approach-withdrawal tendencies. The aim of the present study was to explore how valence and arousal interact at the neural level, during implicit emotion word processing. The emotional attributes of written word stimuli were orthogonally manipulated based on behavioural ratings from a corpus of emotion words. Stimuli were presented during an fMRI experiment while 16 participants performed a lexical decision task, which did not require explicit evaluation of a word's emotional content. Results showed greater neural activation within right insular cortex in response to stimuli evoking conflicting approach-withdrawal tendencies (i.e., positive high-arousal and negative low-arousal words) compared to stimuli evoking congruent approach vs. withdrawal tendencies (i.e., positive low-arousal and negative high-arousal words). Further, a significant cluster of activation in the left extra-striate cortex was found in response to emotional than neutral words, suggesting enhanced perceptual processing of emotionally salient stimuli. These findings support an interactive two-dimensional approach to the study of emotion word recognition and suggest that the integration of valence and arousal dimensions recruits a brain region associated with interoception, emotional awareness and sympathetic functions