Using aptitude measurements for the optimal assignment of subjects to treatments with and without mastery scores

For assigning subjects to treatments the point of intersection of within-group regression lines is ordinarily used as the critical point. This decision rule is critized and, for several utility functions and any number of treatments, replaced by optimal monotone, nonrandomized (Bayes) rules. Both treatments with and without mastery scores are considered. Moreover, the effect of unreliable criterion scores on the optimal decision rule is examined, and it is illustrated how qualitative information can be combined with aptitude measurements to improve treatment assignment decisions. Although the models in this paper are presented with special reference to the aptitude-treatment interaction problem in education, it is indicated that they apply to a variety of situations in which subjects are assigned to treatments on the basis of some predictor score, as long as there are no allocation quota considerations.     

Testing the identity of trends under the restriction of monotonicity in repeated measures designs

Procedures are described for the analysis of profiles of means in repeated measures designs under order restriction for patterns of mean change. The exact likelihood ratio is derived for the case of two groups of subjects, and a computationally simple alternative to the exact likelihood ratio test is provided for designs involving more than two groups. Tables of critical values are provided for the case of simple-order alternatives.The author wishes to thank Joseph C. Saunders for his editorial assistance.     

Quantitative evaluation of infant behaviour and mother–infant interaction: An overview of a japanese interdisciplinary programme of research

This paper provides an overview of an interdisciplinary programme of research started more than 20 years ago at the University of Tokyo. A major aim of this programme was (and still is) to develop methods and related forms of quantitative analysis that provide rigorous evaluations of infant behaviour from a particular theoretical perspective. In one part of the programme telethermography is used to measure emotional changes in young infants. Contrary to the accepted view in attachment theory, infants as young as 2–3 months showed evidence of stress following separation from the mother (as indexed by a drop in the skin temperature of the infant's forehead). In another part, we established the presence of interpersonal synchrony between arm movements of the newborn and the speech of the mother and other adults, using computer assisted pattern recognition techniques. On the basis of this finding, we have proposed a simulation model of mother-infant interaction from the perspective of system information theory. In general, our programme of research provides a theoretically driven set of techniques and analytical approaches that may provide deeper insights into early development and parenting.     

Control and responsiveness in Japanese and German mother-child interactions

The present study aims to examine culturally invariant and culture-specific patterns of mother-child interaction, and, more specifically, to explore the stability and change of such interactions in structurally different situations. Starting from a control theoretical framework (primary and secondary control), we expected that differences in stress induced by differently structured achievement demands would affect mother-child interactions in Japan and Germany differently. For Japanese as compared to German mothers, less primary control and more responsiveness was expected as a result of the cultural value of social orientation. The sample consisted of 20 mother-child dyads (5-year-old girls) in each culture. The experimental procedure confronted each mother-child dyad with three different situations varying with respect to induced stress (from no stress to high stress). The mother-child interactions were videotaped and analysed in regard to control behaviour and responsiveness. Cultural differences with respect to control behaviour were observed in the expected direction only for high-stress situations. Also, Japanese mothers were more responsive in all three situations. Mother's responsiveness was related to child's secondary control in both cultures. Furthermore, Japanese children showed more secondary control than German children.     

Infant and parental pathways to pre-school cognitive competence

In a longitudinal study, 62 parent-child dyads were seen during the second year of life and at 4 years of age. At 12 months, measures included parental sensitive responsiveness during free play, knowledge of cognitive-communicative development in infancy, and level of exploration and disinhibitedness of the infant. At 16 and at 20 months, parental responsiveness and directiveness and infant task mastery behaviour were assessed in constructive play. Quality of verbal guidance of the parent was assessed in a joint attention situation. At 48 months of age, the McCarthy Scales of Children's Abilities were administered at home, together with dyadic tasks. A path analysis revealed a model in which both verbal abilities and perceptual performance outcome measures were well predicted by the quality of parental verbal guidance in the second year. The latter measure was shown to be independent of the socioeconomic status of parents in the group, but was significantly related with knowledge of infant cognitive-communicative development. Of the measures at the outset of the second year, only socioeconomic status remained as having a direct path at pre-school age. The consistency of the model with other empirical findings underscores parental verbal scaffolding as an important shaper of cognitive development.     

EVALUATION OF A SOCIAL INTERACTION COACHING PROGRAM IN AN INTEGRATED DAY-CARE SETTING

We used a multiple baseline design across teachers (with a reversal phase for 1 teacher) to evaluate the direct and indirect effects of a structured coaching procedure on the teaching behaviors of 3 day-care teachers. Structured coaching preceding daily caregiver routines resulted in (a) substantial increases in adult delivery of behavioral support of social interaction during group activities with 2- and 4-year-old children and (b) marked collateral increases in positive interactions of socially withdrawn children. Long-term maintenance effects were demonstrated by both the teachers and target children, and social validity measures indicated that the teachers rated coaching very positively on several dimensions. The results are discussed in relation to in-service training of day-care staff, the concept of coaching as a setting event, and the dissemination of teaching technology related to social interaction of young children.     

Infant intentionality as object directedness: A method for observation*

It is argued that a definition of intentionality in terms of object directedness is more adequate than the traditional definition in terms of goal directedness. Inconsistencies in the use of “intentionality” among infant researchers are pointed out. A method of observation is explored, based on the definition in terms of behavioral object directedness, that takes into account precursors to fully-fledged intentional actions by approaching intentionality as a matter of degree rather than as an all or none issue. The method, when used on longitudinal video recordings of parent-infant interaction, produced results that substantiated Tre-varthen's observations of infant intentionality before the age of six months. Furthermore, the results suggest that the parent's attribution of intentions to the infant is based on the perception of the infant's intentionality, whether in social interaction or in interaction with “physical” objects.