Facial Similarity Mitigates the Persuasive Effects of Source Bias: An Evolutionary Explanation for Kinship and Susceptibility to Influence

This research examined how the interaction between a source's facial similarity to message targets and communicated bias affects audience persuadability. We used an evolutionary explanation to hypothesize that biased sources would elicit less favorable attitudes than unbiased sources for dissimilar sources, but that this difference would be absent for similar sources. Predictions were supported by results from a 2 (facial similarity) × 2 (source bias) experiment, in which an unrecognizable percentage of participants' photographs (n = 94) was digitally morphed with a source's face to act as a kinship cue. Further, structural equation modeling demonstrated a direct effect of facial similarity on attitude independent of mediation by source liking and appraisals, providing further evidence that susceptibility to influence from facially similar sources may have evolutionary origins.     

Ice hockey shoulder pad design and the effect on head response during shoulder-to-head impacts

Ice hockey body checks involving direct shoulder-to-head contact frequently result in head injury. In the current study, we examined the effect of shoulder pad style on the likelihood of head injury from a shoulder-to-head check. Shoulder-to-head body checks were simulated by swinging a modified Hybrid-III anthropomorphic test device (ATD) with and without shoulder pads into a stationary Hybrid-III ATD at 21 km/h. Tests were conducted with three different styles of shoulder pads (traditional, integrated and tethered) and without shoulder pads for the purpose of control. Head response kinematics for the stationary ATD were measured. Compared to the case of no shoulder pads, the three different pad styles significantly (p < 0.05) reduced peak resultant linear head accelerations of the stationary ATD by 35–56%. The integrated shoulder pads reduced linear head accelerations by an additional 18–21% beyond the other two styles of shoulder pads. The data presented here suggest that shoulder pads can be designed to help protect the head of the struck player in a shoulder-to-head check.     

A Two-Factor Theory of the Warm-Up Effect in Jumping Performance

Abstract

Eighty girls aged 16 were divided into four subgroups and given 1, 2, 4 or 6 min. of stool stepping as a warm-up exercise preceding a six-trial vertical jump test. A test-retest balanced order design was used to exclude the practice effect. It was found that 1 or 2 min. of warm-up improved performance approximately 20 percent, while 4 min. had no effect, and 6 min. impaired performance 27 percent. The results agreed with the predictions of an a priori mathematical model that postulated a slow but large exponential fatigue effect, and a faster but smaller exponential warm-up effect that improved performance. The difference between these two factors was the net improvement from warm-up.     

How Students Combine Resources to Make Conceptual Breakthroughs

Research in Science Education - We use the framework of cognitive resources to investigate how students construct understanding of a complex physics topic, namely, a photovoltaic cell. By observing...     

Remote electronic examinations: student experiences

This paper presents the findings from a small–scale experiment investigating the presentation of a synchronous remote electronic examination. It discusses the students' experiences of taking such an examination. The study confirms that the majority of participants found the experience at least as good as a conventional written examination. In addition, typing answers does not prevent students from producing answers in the time available. However, the pressure of time continues to be a major cause of anxiety for students. The paper discusses technical issues, particularly those related to the loss of communications during the 3–hour duration of the exam. Although software processes were available to save and restore students' answers throughout the examination, problems still occurred and more robust software is required.