After the storm: enduring differences in mother-child recollections of traumatic and nontraumatic events

Despite a growing literature on the collaborative reminiscing of mothers and children, little is known about the kinds of things mothers and children discuss as they recollect shared traumatic experiences. Do mother-child recollections of a traumatic event differ from their recollections of more benign events? To address this question, mother-child dyads (N=29) discussed a traumatic event, namely a devastating tornado, and two nontraumatic events (one that preceded and one that followed the tornado). Each dyad discussed all three events 4-months post-tornado and again 6 months later. Whereas conversations about both event types (traumatic and nontraumatic) varied with children's age, dyads' recollections of the tornado were significantly longer, more narratively coherent, and more complete than their recollections of nontraumatic events. These differences largely endured over the 6-month retention interval.     

The role of nonlinear factor-to-indicator relationships in tests of measurement equivalence

Measurement invariance is a necessary condition for the evaluation of factor mean differences over groups or time. This article considers the potential problems that can arise for tests of measurement invariance when the true factor-to-indicator relationship is nonlinear (quadratic) and invariant but the linear factor model is nevertheless applied. The factor loadings and indicator intercepts of the linear model will diverge across groups as the factor mean difference increases. Power analyses show that even apparently small quadratic effects can result in rejection of measurement invariance at moderate sample sizes when the factor mean difference is medium to large. Recommendations include the identification of nonlinear relationships using diagnostic plots and consideration of newly developed methods for fitting nonlinear factor models.     

A longitudinal study of gendered vocabulary and communicative action in young children

Development of children's vocabularies for gender-typed words and communicative actions was investigated longitudinally from 13 to 36 months and in a group of 9.5-month-olds. Vocabularies of gendered words were assessed using lists of adult-rated gender-typed words from the MacArthur-Bates Communicative Development Inventories (CDI; L. Fenson et al., 1994). At 24 to 36 months, girls' and boys' productive vocabularies contained more same-gender-typed words than other-gender-typed words. Receptive vocabulary gender-differential effects were apparent among boys at 18 months. At 13 and 18 months, gender-typed differences were apparent in communicative actions. The research reveals the utility of unobtrusive, nonexperimental measures for assessing gender-related knowledge and behavior in young children.     

Behavior Therapy for Stereotypic Movement Disorder in Typically Developing Children: A Clinical Case Series

Stereotypic movement disorder (SMD) is characterized by repetitive, rhythmic, episodic movement and is associated with distress and functional impairment. A range of behavioral strategies have been implemented for the treatment of stereotypies, but research on the effectiveness of behavior therapy in typically developing children is limited. The following case series describes the implementation of behavior therapy for 3 typically developing children (ages 12 to 14) with SMD. Results showed significant reductions in the frequency and intensity of the stereotypies. Future refinement and testing of a behavior therapy protocol is recommended.     

Talking about Twisters: Relations between Mothers' and Children's Contributions to Conversations about a Devastating Tornado

Mother-child dyads who experienced a devastating tornado talked about the storm and about two affectively more positive or neutral events at each of two time points: 4 months and 10 months after the storm. The conversations were analyzed to determine whether mothers and/or children's contributions differed as a function of event type and whether there were concurrent and/or cross-lagged relations between mothers and children's contributions to the conversations. For both members of the dyads, contributions were similar (and correlated) across event types. Maternal narrative style related to children's levels of participation and to the amount of unique information the children contributed to the conversations, both concurrently and over time; cross-lagged relations were more robust for the tornado relative to the nontornado related events. The implications of the patterns for socialization models of autobiographical memory development are discussed.     

Elicited Imitation Performance at 20 Months Predicts Memory Abilities in School-Aged Children

During the first decade of life, there are marked improvements in mnemonic abilities. An important question from both a theoretical and applied perspective is the extent of continuity in the nature of memory during this period. The present longitudinal investigation examined declarative memory during the transition from toddlerhood to school age using both experimental and standardized assessments. Results indicate significant associations between immediate nonverbal recall at 20 months (measured by elicited imitation) and immediate verbal and nonverbal memory (measured by standardized and laboratory-based tasks) at 6 years in typically developing children. Regression models revealed this association was specific, as measures of language abilities and temperament were not predictive of later memory performance. These findings suggest both continuity and specificity within the declarative memory system during the first years of life. Theoretical and applied implications of these findings are discussed.     

Observations on the Use of Growth Mixture Models in Psychological Research

Psychologists are applying growth mixture models at an increasing rate. This article argues that most of these applications are unlikely to reproduce the underlying taxonic structure of the population. At a more fundamental level, in many cases there is probably no taxonic structure to be found. Latent growth classes then categorically approximate the true continuum of individual differences in change. This approximation, although in some cases potentially useful, can also be problematic. The utility of growth mixture models for psychological science thus remains in doubt. Some ways in which these models might be more profitably used are suggested.