Browsing by Author "Cooper, Harris"
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Item Open Access A brief history of research synthesis.(Eval Health Prof, 2002-03) Chalmers, Iain; Hedges, Larry V; Cooper, HarrisScience is supposed to be cumulative, but scientists only rarely cumulate evidence scientifically. This means that users of research evidence have to cope with a plethora of reports of individual studies with no systematic attempt made to present new results in the context of similar studies. Although the need to synthesize research evidence has been recognized for well over two centuries, explicit methods for this form of research were not developed until the 20th century. The development of methods to reduce statistical imprecision using quantitative synthesis (meta-analysis) preceded the development of methods to reduce biases, the latter only beginning to receive proper attention during the last quarter of the 20th century. In this article, the authors identify some of the trends and highlights in this history, to which researchers in the physical, natural, and social sciences have all contributed, and speculate briefly about the "future history" of research synthesis.Item Open Access Aerobic exercise and neurocognitive performance: a meta-analytic review of randomized controlled trials.(Psychosom Med, 2010-04) Smith, Patrick J; Blumenthal, James A; Hoffman, Benson M; Cooper, Harris; Strauman, Timothy A; Welsh-Bohmer, Kathleen; Browndyke, Jeffrey N; Sherwood, AndrewOBJECTIVES: To assess the effects of aerobic exercise training on neurocognitive performance. Although the effects of exercise on neurocognition have been the subject of several previous reviews and meta-analyses, they have been hampered by methodological shortcomings and are now outdated as a result of the recent publication of several large-scale, randomized, controlled trials (RCTs). METHODS: We conducted a systematic literature review of RCTs examining the association between aerobic exercise training on neurocognitive performance between January 1966 and July 2009. Suitable studies were selected for inclusion according to the following criteria: randomized treatment allocation; mean age > or =18 years of age; duration of treatment >1 month; incorporated aerobic exercise components; supervised exercise training; the presence of a nonaerobic-exercise control group; and sufficient information to derive effect size data. RESULTS: Twenty-nine studies met inclusion criteria and were included in our analyses, representing data from 2049 participants and 234 effect sizes. Individuals randomly assigned to receive aerobic exercise training demonstrated modest improvements in attention and processing speed (g = 0.158; 95% confidence interval [CI]; 0.055-0.260; p = .003), executive function (g = 0.123; 95% CI, 0.021-0.225; p = .018), and memory (g = 0.128; 95% CI, 0.015-0.241; p = .026). CONCLUSIONS: Aerobic exercise training is associated with modest improvements in attention and processing speed, executive function, and memory, although the effects of exercise on working memory are less consistent. Rigorous RCTs are needed with larger samples, appropriate controls, and longer follow-up periods.Item Open Access Cues to deception.(Psychol Bull, 2003-01) DePaulo, Bella M; Lindsay, James J; Malone, Brian E; Muhlenbruck, Laura; Charlton, Kelly; Cooper, HarrisDo people behave differently when they are lying compared with when they are telling the truth? The combined results of 1,338 estimates of 158 cues to deception are reported. Results show that in some ways, liars are less forthcoming than truth tellers, and they tell less compelling tales. They also make a more negative impression and are more tense. Their stories include fewer ordinary imperfections and unusual contents. However, many behaviors showed no discernible links, or only weak links, to deceit. Cues to deception were more pronounced when people were motivated to succeed, especially when the motivations were identity relevant rather than monetary or material. Cues to deception were also stronger when lies were about transgressions.Item Open Access Effectiveness of mentoring programs for youth: a meta-analytic review.(Am J Community Psychol, 2002-04) DuBois, David L; Holloway, Bruce E; Valentine, Jeffrey C; Cooper, HarrisWe used meta-analysis to review 55 evaluations of the effects of mentoring programs on youth. Overall, findings provide evidence of only a modest or small benefit of program participation for the average youth. Program effects are enhanced significantly, however, when greater numbers of both theory-based and empirically based "best practices" are utilized and when strong relationships are formed between mentors and youth. Youth from backgrounds of environmental risk and disadvantage appear most likely to benefit from participation in mentoring programs. Outcomes for youth at-risk due to personal vulnerabilities have varied substantially in relation to program characteristics, with a noteworthy potential evident for poorly implemented programs to actually have an adverse effect on such youth. Recommendations include greater adherence to guidelines for the design and implementation of effective mentoring programs as well as more in-depth assessment of relationship and contextual factors in the evaluation of programs.Item Open Access Grade Expectations: An Investigation of Performance Feedback, Classroom Goal Structures, and the Motivational Consequences of their Dynamic Interplay(2015) Koenka, AlisonThe salience, prevalence, and consequences of feedback students receive on their academic performance have led to widespread interest in assessment outcomes. Despite the frequency and high stakes of performance feedback, a clear picture of how it influences students' academic motivation has failed to emerge. The overarching goal of this dissertation study was to better understand the effect of performance feedback on secondary school students' academic motivation following a high-stakes assessment. In particular, this study had three main aims: (1) begin disentangling the influence of performance feedback from its valence on students' self-efficacy, goal orientations, and intrinsic motivation, (2) explore how the stage of an assessment event and performance feedback interact to influence these motivation constructs, and (3) determine whether the influence of performance feedback on academic motivation depends on the evaluation dimension of the classroom goal structure.
To investigate these topical questions, the current study implemented a cluster-randomized experimental design. One hundred sixty-one seventh through ninth grade students in 13 math or science classes from a single, all-female secondary school were randomly assigned by their class to one of the following four feedback conditions: (1) numeric grades, (2) evaluative comments, (3) numeric grades accompanied by evaluative comments, and (4) no feedback. Students' academic motivation was then measured on three occasions to capture its fluctuations during an assessment event: at baseline, immediately after teachers announced what form of feedback students would receive (i.e., anticipation stage), and immediately after students received their assigned form of feedback (i.e., receipt stage).
Results revealed a series of complex interactions between the stage of feedback (i.e., anticipation vs. receipt) and its form (i.e., grades, comments, grades plus comments, or no feedback). Notably, only students in the grades plus comments condition experienced a decline in self-efficacy from anticipation to receipt of this feedback. However, these students also reported an increase in their mastery goal orientation and intrinsic motivation upon the receipt of grades accompanied by comments. Students in the comments condition experienced a similar increase in intrinsic motivation. Finally, students in the no feedback and comments conditions also reported a greater performance-approach goal orientation when they received performance feedback (or lack thereof) compared to when they anticipated it. No evidence was found to support the hypothesis that students' perceptions of the evaluation dimension of their classroom goal structure moderated these interaction effects. Theoretical, methodological, and practical implications of these findings are discussed along with limitations and recommendations for future research.
Item Open Access Psychological Bulletin: Editorial.(Psychological Bulletin, 2003) Cooper, HarrisItem Open Access Reporting standards for literature searches and report inclusion criteria: making research syntheses more transparent and easy to replicate.(Res Synth Methods, 2015-03) Atkinson, Kayla M; Koenka, Alison C; Sanchez, Carmen E; Moshontz, Hannah; Cooper, HarrisA complete description of the literature search, including the criteria used for the inclusion of reports after they have been located, used in a research synthesis or meta-analysis is critical if subsequent researchers are to accurately evaluate and reproduce a synthesis' methods and results. Based on previous guidelines and new suggestions, we present a set of focused and detailed standards for reporting the methods used in a literature search. The guidelines cover five search strategies: reference database searches, journal and bibliography searches, searches of the reference lists of reports, citation searches, and direct contact searches. First, we bring together all the unique recommendations made in existing guidelines for research synthesis. Second, we identify gaps in reporting standards for search strategies. Third, we address these gaps by providing new reporting recommendations. Our hope is to facilitate successful evaluation and replication of research synthesis results.Item Open Access The Motivational Benefits and Limits of Choice(2009) Patall, Erika AlishaThis investigation explored the conditions that minimize the negative effects of lacking choice and maximize the positive effects of having choice. Four experimental studies were conducted with college students as participants. Four aspects of this issue were addressed: (a) whether the saliency of not having a choice moderates the detrimental effects of lacking choice, (b) whether having choice is more beneficial when the type of choice is less costly in terms of self-regulatory effort, (c) whether the effect of choice on motivation is influenced by the number of choices an individual must make, and (d) whether perceived competence mediates of the relationships between choice, motivation and performance. Overall, this investigation failed to provide substantial support for the hypotheses regarding factors that might moderate the effects of choice on motivation. Null results are proposed to be largely attributable to the strength of the choice manipulations, the nature of the tasks used, and characteristics of participants. The results of two studies provided partial support for hypotheses showing that participants in no-choice conditions experienced a decrease in perceived competence or intrinsic motivation for the task, while participants who received a choice experienced no such decrease. This in conjunction with evidence showing that the participants found the task to be more difficult than expected suggested that choice may serve a protective function for difficult tasks. Further, exploratory analyses revealed that that the effect of choice may be more beneficial for individuals with low perceived or actual competence and that restricting choice may be more detrimental to individuals with high perceived or actual competence. Ways in which future studies may address the limitations of the present investigation and build on exploratory findings are discussed.