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41.
Rate of Torque Development and Feedforward Control of the Hip and Knee Extensors: Gender Differences
Kristen M. Stearns-Reider 《Journal of motor behavior》2018,50(3):321-329
The purpose of this study was to determine whether women demonstrate decreased rate of torque development (RTD) of the hip and knee extensors and altered onset timing of the vastus lateralis and gluteus maximus during a drop-jump task when compared with men. On average, women demonstrated significantly lower normalized RTD of the hip extensors (women: 11.6 ± 1.3 MVT.s?1, men: 13.1 ± 0.9 MVT.s?1; p ≤ .01); however, there was no significant difference in knee extensor RTD. Women also demonstrated significantly earlier activation of their vastus lateralis (women: 206.0 ± 130.6 ms, men: 80.9 ± 69.6 ms; p ≤ .01) and gluteus maximus (women: 85.7 ± 58.6 ms, men: 54.5 ± 35.4 ms; p = .02). In both men and women, there was a significant negative correlation between the hip extensor RTD and the vastus lateralis electromyographic onset time (men: r = –.386, p = .046; women: r = –.531, p = .008). The study findings suggest that women may utilize a feedforward control strategy in which they activate their knee extensors earlier than men to compensate for deficits in hip extensor RTD. The impaired capacity to rapidly stabilize the hip and knee joints during dynamic maneuvers may contribute to the increased risk of anterior cruciate ligament injury observed in women. 相似文献
42.
This study examined work–family conflict decision‐making based on a within–person, episodic approach. Based on 274 episodes across 78 individuals, we investigated the frequency of decisions that result in work interference with family (WIF) versus family interference with work (FIW), as well as the relation of work and family situational variables and previous work–family conflict (WFC) episodes on those decisions. No difference in the frequency with which participants reported WIF episodes versus FIW episodes was observed. Results indicated that work/family role sender pressure, work/family instrumental support, work/family activity importance, work emotional support, and the direction of the previous WFC decision each predicted WFC decisions. Dominance analysis indicated that role sender pressure was the most important predictor. In addition, we compare and discuss within‐person variation with between‐person variation. Contributions of the study to work–family research and practice are discussed. 相似文献
43.
Not All Hazards are Created Equal: The Significance of Hazards in Inattentional Blindness for Static Driving Scenes
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Explaining how we attend to some objects and not others in real world environments remains a challenge for theories of attention. Driving is an ideal example of this, as it requires a complex synthesis of attentional processing, while still allowing attention to be captured by hazards. In the current study we employed a static inattentional blindness (IB) driving task in which participants were required to make decisions about the content of driving‐related scenarios. In a critical trial, an additional stimulus was added to the driving scenario. All unexpected stimuli were thematically consistent with a normal driving environment but varied in their level of hazard threat. Rates of IB were consistent with the level of hazard threat of the stimuli. The results are discussed in terms of semantic‐based attentional capture in driving, and models of IB.Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
44.
Three studies assessed the relationship between language and the perception of emotion. The authors predicted and found that the accessibility of emotion words influenced participants' speed or accuracy in perceiving facial behaviors depicting emotion. Specifically, emotion words were either primed or temporarily made less accessible using a semantic satiation procedure. In Studies 1 and 2, participants were slower to categorize facial behaviors depicting emotion (i.e., a face depicting anger) after an emotion word (e.g., "anger") was satiated. In Study 3, participants were less accurate to categorize facial behaviors depicting emotion after an emotion word was satiated. The implications of these findings for a linguistically relative view of emotion perception are discussed. 相似文献
45.
In everyday life, the optic flow associated with the performance of complex actions, like walking through a field of obstacles and catching a ball, entails retinal flow with motion energy (first-order motion). We report the results of four complex action tasks performed in virtual environments without any retinal motion energy. Specifically, we used dynamic random-dot stereograms with single-frame lifetimes (cyclopean stimuli) such that in neither eye was there retinal motion energy or other monocular information about the actions being performed. Performance on the four tasks with the cyclopean stimuli was comparable to performance with luminance stimuli, which do provide retinal optic flow. The near equivalence of the two types of stimuli indicates that if optic flow is involved in the control of action, it is not tied to first-order retinal motion. 相似文献
46.
How do we determine where we are heading during visually controlled locomotion? Psychophysical research has shown that humans are quite good at judging their travel direction, or heading, from retinal optic flow. Here we show that retinal optic flow is sufficient, but not necessary, for determining heading. By using a purely cyclopean stimulus (random dot cinematogram), we demonstrate heading perception without retinal optic flow. We also show that heading judgments are equally accurate for the cyclopean stimulus and a conventional optic flow stimulus, when the two are matched for motion visibility. The human visual system thus demonstrates flexible, robust use of available visual cues for perceiving heading direction. 相似文献
47.
Annika Melinder Kristen Alexander Gail S. Goodman Kyrre Lonnum 《Journal of experimental child psychology》2010,105(3):156-177
A critical issue for developmental psychology is how to obtain accurate and complete eyewitness memory reports from preschoolers without offering suggestions that might result in false allegations. We examined effects of two interviewing strategies (police/verbal interviews and clinician/prop-assisted interviews) on young children’s reports about a medical examination. A total of 58 4-year-olds participated in the study, which conformed to a 2 (Interview Type) × 2 (Number of Interviews) factorial design. Analyses revealed that interviewers spent less time off topic and asked more free recall questions in the police/verbal interviews than in the clinician/prop-assisted interviews. Compared with police/verbal interviews, clinician/prop-assisted interviews resulted in significantly more correct rejections and commission errors in children’s memory reports. However, on a final free recall test, error rates were comparable across conditions. Higher child verbal intelligence predicted memory accuracy in police/verbal interviews, and greater parental attachment anxiety predicted children being asked a higher number of misleading questions. The study provides new insights into interview techniques that promote preschoolers’ accurate eyewitness reports. 相似文献
48.
Daniel Gould Kristen Dieffenbach Aaron Moffett 《Journal of Applied Sport Psychology》2013,25(3):172-204
This study was designed to examine psychological characteristics and their development in Olympic champions. Ten U.S. Olympic champions (winners of 32 Olympic medals) were interviewed, as were one of their coaches ( n = 10), and a parent, guardian, or significant other ( n = 10). A battery of psychological inventories was also administered to the athletes. It was found that the athletes were characterized by: (a) the ability to cope with and control anxiety; (b) confidence; (c) mental toughness/resiliency; (d) sport intelligence; (e) the ability to focus and block out distractions; (f) competitiveness; (g) a hard-work ethic; (h) the ability to set and achieve goals; (i) coachability; (j) high levels of dispositional hope; (k) optimism; and (l) adaptive perfectionism. Results also revealed that a number of individuals and institutions influenced the athletes' psychological development including the community, family, the individual himself or herself, non-sport personnel, sport environment personnel, and the sport process. Coach and family influences were particularly important. Ways in which these sources influenced the athletes were both direct, like teaching or emphasizing certain psychological lessons, and indirect, involving modeling or unintentionally creating certain psychological environments. Psychological characteristic findings verified current sport psychological research on psychological characteristics associated with peak performance (Williams & Krane, 2001). They also suggest that adaptive perfectionism, dispositional hope, and high levels of optimism are new variables to consider. Results are also discussed relative to Bloom's (1985), Côtè's (1999) and Csikzentmihalyi, Rathunde, Whalen, and Wong's (1993) talent development research. Practical implications focus on implementing parenting and coaching practices related to the development of psychological characteristics associated with athletic success. 相似文献
49.
Judgment by students of faculty effectiveness have relied, for the most part, on subjectively expressed responses to a series of “effectiveness traits” (cues). Simple averaging schemes have summarized the aggregate judgments, often resulting in (a) treating all cues as if they were of equal importance, and (b) inattention to the effects or measurement of individual differences of judges. Multiple regression was used in this study to derive (empirically) individual cue utilization patterns (i.e., weights) for 10 effectiveness traits. Ss were compared to their subjectively expressed judgment scheme. Results indicate that Ss were moderately successful in expressing their actual cue utilization patterns; however, different judgment schemes were clearly observed. 相似文献
50.
Edith C. Kieffer Cleopatra H. Caldwell Diana B. Welmerink Kathleen B. Welch Brandy R. Sinco J. Ricardo Guzmán 《American journal of community psychology》2013,51(1-2):76-89
Depression during the prenatal and postpartum periods is associated with poor maternal, perinatal and child outcomes. This study examines the effectiveness of a culturally and linguistically tailored, social support-based, healthy lifestyle intervention led by trained community health workers in reducing depressive symptoms among pregnant and early postpartum Latinas. A sample of 275 pregnant Latinas was randomized to the Healthy MOMs Healthy Lifestyle Intervention (MOMs) or the Healthy Pregnancy Education (control) group. More than one-third of participants were at risk for depression at baseline. MOMs participants were less likely than control group participants to be at risk for depression at follow-up. Between baseline and 6 weeks postpartum, MOMs participants experienced a significant decline in depressive symptoms; control participants experienced a marginally significant decline. For MOMs participants, most of this decline occurred during the pregnancy intervention period, a time when no change occurred for control participants. The change in depressive symptoms during this period was greater among MOMs than control participants (“intervention effect”). From baseline to postpartum, there was a significant intervention effect among non-English-speaking women only. These findings provide evidence that a community-planned, culturally tailored healthy lifestyle intervention led by community health workers can reduce depressive symptoms among pregnant, Spanish-speaking Latinas. 相似文献