A six-district study of educational change: direct and mediated effects of the child development project

A comprehensive elementary school program, the Child Development Project, was conducted in two schools in each of six school districts over a three-year period. Two additional schools in each district served as a comparison group. The program attempts to create a 'caring community of learners' in school and classroom through classroom, schoolwide, and parent involvement components. The classroom component includes student collaboration, a literature-based approach to reading, and a student-centered approach to classroom management. Classroom observation, student questionnaire, teacher questionnaire, and test data were collected in a baseline year and in each of the three years of program implementation. Results showed positive student results in the five program schools that made significant progress in implementation. Schools that progressed in implementation showed gains – relative to their comparison schools – in students' personal, social, and ethical attitudes, values, and motives. Significant effects on academic achievement were found only in two schools with a performance-based assessment and a highly consistent local reform mandate. Modeling analyses indicated that student sense of community was an important mediating variable for almost all dependent variables – indicating that the program produced positive effects to the degree that it was successful in establishing a caring community in the school.     

The sibling uncertainty hypothesis: Facial resemblance as a sibling recognition cue

For the same reason that fathers could not have been certain their mates’ offspring were their genetic progeny during human evolutionary history, full siblings could not have been certain that they shared paternal genes. Previous kin recognition research suggests facial resemblance is a cue men use to help solve the adaptive problem of paternity uncertainty and identify their biological offspring. Facial resemblance may also be a cue individuals use to identify siblings who share paternal genes. In the current study, facial resemblance between siblings was hypothesized to be positively associated with their emotional closeness and altruism, and inversely related with their frequency of conflict. Within families, individuals reported greater closeness and altruism toward siblings who more closely resembled them. In contrast with previous offspring recognition research, the effects of resemblance were not sex-differentiated, suggesting that facial resemblance is a cue both sexes use in sibling recognition.     

The beginning of conversation: Early patterns of mother-infant vocal responsiveness

Microanalytic techniques were used to characterize the structure of the prespeech communication of 4-month-old infants and their mothers. Two observers continuously recorded the interactive behavior of mothers and their infants during hour-long observations in the homes of 25 families. Loglinear models were used to examine the extent to which the vocal behavior of one person was conditional upon the vocal behavior of the partner. Within the limits of this microanalytic approach, analyses indicated that patterns of mother-infant vocal exchange were structurally similar to patterns of adult conversation. Initial vocal responses were followed by suppression of vocalization, allowing the partner to join the conversation. The comparative effectiveness of vocal behavior as an elicitor of vocalization and as a response to vocalization was shown for mothers and infants relative to the other behaviors observed. Vocalization served as a modulator of visual attentiveness: When the partner was not visually attentive, vocalization elicited visual attention.     

Effects of short-term crowding on aggression in captive groups of pigtail monkeys (macaca nemestrina)

Agonistic behaviors of 14 groups of pigtail monkeys were monitored under 2 spatial conditions, normal living space and half that amount of space. Aggression occurred less frequently in the crowded than in the relatively less crowded condition. The results of this study resemble those of some analogous research on human children, and they suggest that nonhuman primate models of crowding stress and aggression may be especially appropriate.