Reflections on the Practicality of Good Theory

Jennifer Kennison noticed something different about the way her high school chemistry students were working together during Complex Instruction rotation. Her attention to the change in her students’ learning caused me to think about how Elizabeth Cohen’s often referenced Kurt Lewin’s comment “There is nothing so practical as a good theory.” As a result, I decided to ask two students who were teaching CI rotations if they would be interested in working together on a conference presentation that looked at their work through the eyes of Lewin’s dictum. They would take on responsibility for documenting and writing about their CI units and I, their advisor, would take on Lewin. Both Jennifer, an experienced teacher and MEd. candidate, and Bethany Brodeur, a senior elementary education major, agreed to this task. The resulting papers formed the core of our presentation at the 2004 conference of the New England Educational Research Organization. Together, they form a short volume that integrates learning about CI with the practical implications of implementation of CI at the elementary and secondary levels. This paper reports my observations of their work confirming Lewin’s dictum and Cohen’s wisdom. C

Rapid Cortisol and Testosterone Responses to Sex-Linked Stressors: Implications for the Tend-and-Befriend Hypothesis

Current evolutionary theories regarding the nature of hormonal responses to a variety of salient social stimuli are incomplete in yielding evidentiary support for their assertions. This study offers more nuanced evidence for the Tend-and- Befriend model of sex differences in responses to social stimuli. Participants were randomly assigned to a mortality salience prime or a control condition prior to viewing a video of an out-group threat or a video of infants crying. Cortisol and testosterone responses were assessed. The results showed that in mortality salience conditions, females showed significantly higher cortisol responses to infants crying compared to males. Further, in both mortality salience and control conditions, females showed significantly higher testosterone responses to the crying infants than males. Males showed a greater testosterone response to viewing an out-group threat. Mortality salience prime did not impact testosterone responses in either sex. Results point to a more nuanced representation of hormonal responses to social stimuli and the need for multisystem measurement

Rapid Cortisol and Testosterone Responses to Sex-Linked Stressors: Implications for the Tend-and-Befriend Hypothesis

Current evolutionary theories regarding the nature of hormonal responses to a variety of salient social stimuli are incomplete in yielding evidentiary support for their assertions. This study offers more nuanced evidence for the Tend-and- Befriend model of sex differences in responses to social stimuli. Participants were randomly assigned to a mortality salience prime or a control condition prior to viewing a video of an out-group threat or a video of infants crying. Cortisol and testosterone responses were assessed. The results showed that in mortality salience conditions, females showed significantly higher cortisol responses to infants crying compared to males. Further, in both mortality salience and control conditions, females showed significantly higher testosterone responses to the crying infants than males. Males showed a greater testosterone response to viewing an out-group threat. Mortality salience prime did not impact testosterone responses in either sex. Results point to a more nuanced representation of hormonal responses to social stimuli and the need for multisystem measurement

Individual differences in talking enjoyment: The roles of life history strategy and mate value

The present research explored the possibility that individual differences in talking enjoyment may play a role in human reproduction, such as mate advertising in humans. Prior research on talking has tended to focus on sex differences in the amount of talking. We present a new self-report measure to assess individual differences in talking enjoyment and explore its relationships with self-perceived mate value and life history strategy. In Study 1, we assessed talking enjoyment with an 11-item talking enjoyment questionnaire and found that (a) women’s average talking enjoyment and Mini-K ratings were significantly higher than men’s; (b) talking enjoyment was predicted by life history strategy as measured by and self-rated mate value; and (c) the relationship between sex and talking enjoyment was mediated by life history strategy. In Study 2, we replicated the results of Study 1 with a revised eight-item talking enjoyment questionnaire after confirming its test-retest reliability. The results provide new insights into individual differences in talking enjoyment. Directions for future research on the relationship talking behavior and mate selection in humans are discussed

Financial and ethical risk-taking by young adults: A role for family dynamics during childhood

The research tested the hypothesis that childhood relationships with parents were related to risk-taking by young adults. Prior research has shown that risk-taking by young children is related to their interactions with mothers and fathers. Few studies have examined how family relationships during childhood are related to risk-taking by young adults. We assessed risk-taking using the domain-specific risk-taking scale (DOSPERT), which measures five domains of risk-taking: ethical, financial, health, recreational, and social. We also assessed sensation-seeking, a personality trait that has been shown to be a predictor of risk-taking and family dynamics, using a measure that quantifies positive and negative childhood relationships with each parent. The three key results were (1) negative mother interactions predicted men’s financial risk-taking; (2) negative father interactions and disinhibition predicted men’s ethical risk-taking; and (3) women’s ethical risk-taking was predicted by negative father interactions, low positive mother interactions, and boredom susceptibility. Implications for identifying young adults most at-risk for ethical and financial risk-taking are discussed

The Effect of Mortality Salience on Women's Judgments of Male Faces

Previous research has shown that individuals who are reminded of their death exhibited a greater desire for offspring than those who were not reminded of their death. The present research investigated whether being reminded of mortality affects mate selection behaviors, such as facial preference judgments. Prior research has shown that women prefer more masculine faces when they are at the high versus low fertility phase of their menstrual cycles. We report an experiment in which women were tested either at their high or fertility phase. They were randomly assigned to either a mortality salience (MS) or control condition and then asked to judge faces ranging from extreme masculine to extreme feminine. The results showed that women's choice of the attractive male face was determined by an interaction between fertility phase and condition. In control conditions, high fertility phase women preferred a significantly more masculine face than women who were in a lower fertility phase of their menstrual cycles. In MS conditions, high fertility phase women preferred a significantly less masculine (i.e., more average) face than women who were in a low fertility phase. The results indicate that biological processes, such as fertility phase, involved in mate selection are sensitive to current environmental factors, such as death reminders. This sensitivity may serve as an adaptive compromise when choosing a mate in potentially adverse environmental conditions

Histone chaperone ASF1 cooperates with the Brahma chromatin-remodelling machinery

De novo chromatin assembly into regularly spaced nucleosomal arrays is essential for eukaryotic genome maintenance and inheritance. The Anti-Silencing Function 1 protein (ASF1) has been shown to be a histone chaperone, participating in DNA-replication-coupled nucleosome assembly. We show that mutations in the Drosophila asf1 gene derepress silencing at heterochromatin and that the ASF1 protein has a cell cycle-specific nuclear and cytoplasmic localization. Furthermore, using both genetic and biochemical methods, we demonstrate that ASF1 interacts with the Brahma (SWI/SNF) chromatin-remodelling complex. These findings suggest that ASF1 plays a crucial role in both chromatin assembly and SWI/SNF-mediated chromatin remodelling