James J. Lindsay

The Effects of Summer Vacation on Achievement Test Scores: A Narrative and Meta-Analytic Review

A review of 39 studies indicated that achievement test scores decline over summer vacation. The results of the 13 most recent studies were combined using meta-analytic procedures. The meta-analysis indicated that the summer loss equaled about one month on a grade-level equivalent scale, or one tenth of a standard deviation relative to spring test scores. The effect of summer break was more detrimental for math than for reading and most detrimental for math computation and spelling. Also, middle-class students appeared to gain on grade-level equivalent reading recognition tests over summer while lower-class students lost on them. There were no moderating effects for student gender or race, but the negative effect of summer did increase with increases in students’ grade levels. Suggested explanations for the findings include the differential availability of opportunities to practice different academic material over summer (with reading practice more available than math practice) and differences in the material’s susceptibility to memory decay (with fact- and procedure-based knowledge more easily forgotten than conceptual knowledge). The income differences also may be related to differences in opportunities to practice and learn. The results are examined for implications concerning summer school programs and proposals concerning school calendar changes

Research in the Psychological Laboratory Truth or Triviality

This article examines the truism that studies from psychological laboratories are low in external validity. Past rational and empirical explorations of this truism found little support for it. A broader empirical approach was taken for the study reported here; correspondence between lab and field was compared across a broad range of domains, including aggression, helping, leadership style, social loafing, self-efficacy, depression, and memory, among others. Correspondence between lab- and field-based effect sizes of conceptually similar independent and dependent variables was considerable. In brief, the psychological laboratory has generally produced psychological truths, rather than trivialities. These same data suggest that a companion truism about field studies in psychology—that they are generally low on internal validity—is also false.

Relationships among Attitudes about Homework, Amount of Homework Assigned and Completed, and Student Achievement.

Students (n = 709), parents, and teachers (n = 82) completed a questionnaire concerning amount of homework assigned by teachers, portion of assignments completed by students, and attitudes about homework. Student achievement measures were also collected. Weak relations were found between the amount of homework assigned and student achievement. Positive relations were found between the amount of homework students completed and achievement, especially at upper grades (6-12). At lower grades (2 and 4), teacher-assigned homework was related to negative student attitudes. At upper grades, teachers with more positive attitudes toward homework and those whose students performed more poorly on stantlardized tests reported assigning more homework. A path analysis for lower grades indicated that class grades were predicted only by standardized test scores and the proportion of homework completed by students. At upper grades, class grade predictors also included parent, teacher, and student attitudes.

From Antecedent Conditions to Violent Actions: A General Affective Aggression Model

The General Affective Aggression Model (GAAM) posits that variables that increase aggression do so by increasing aggressive affect, aggressive cognition, or arousal. The effects of trait hostility, pain, and cognitive cues on state hostility (Experiment 1), on lexical decisions for aggressive and control words (Experiment 2), on escape motives (Experiment 3), and on aggressive behavior (Experiment 4) are presented. Consistent with GAAM, trait hostility increased both flight and fight motives, presumably due to affective reactions. Pain also increased hostile affect but increased aggression only when aggressive thoughts were made highly accessible (i.e., after viewing gun pictures). Theoretical implications are discussed.

A Model of Homework's Influence on the Performance Evaluations of Elementary School Students.

Abstract This study was the first to test a model of the influence of homework on classroom performance using a sample of elementary school students. A total of 28 teachers in Grades 2 and 4 took part in the study, along with 428 students and parents. The authors used structural equation modeling to examine relationships among variables. Student norms were positively related to the elimination of distractions from homework by parents. Positive student norms, higher student ability, and positive parent attitudes toward homework were all related to greater parent facilitation. Students attitude toward homework was unrelated to home and community factors but was related positively to parent attitudes toward homework. Classroom grades were unrelated to students attitude toward homework but were predicted by how much homework the student completed (even after the use of homework in grading was controlled), by student ability, and by the amount of parent facilitation. More generally, parent facilitation was an important mediator of the relation between student norms, student ability, and parent attitudes toward homework, and the outcome of classroom grades.