Random effects regression mixtures for analyzing infant habituation

Random effects regression mixture models are a way to classify longitudinal data (or trajectories) having possibly varying lengths. The mixture structure of the traditional random effects regression mixture model arises through the distribution of the random regression coefficients, which is assumed to be a mixture of multivariate normals. An extension of this standard model is presented that accounts for various levels of heterogeneity among the trajectories, depending on their assumed error structure. A standard likelihood ratio test is presented for testing this error structure assumption. Full details of an expectation-conditional maximization algorithm for maximum likelihood estimation are also presented. This model is used to analyze data from an infant habituation experiment, where it is desirable to assess whether infants comprise different populations in terms of their habituation time.     

The Persistent Problem of Colorism: Skin Tone, Status, and Inequality

Colorism is a persistent problem for people of color in the USA. Colorism, or skin color stratification, is a process that privileges light-skinned people of color over dark in areas such as income, education, housing, and the marriage market. This essay describes the experiences of African Americans, Latinos, and Asian Americans with regard to skin color. Research demonstrates that light-skinned people have clear advantages in these areas, even when controlling for other background variables. However, dark-skinned people of color are typically regarded as more ethnically authentic or legitimate than light-skinned people. Colorism is directly related to the larger system of racism in the USA and around the world. The color complex is also exported around the globe, in part through US media images, and helps to sustain the multibillion-dollar skin bleaching and cosmetic surgery industries.     

Intersensory Redundancy Enhances Memory in Bobwhite Quail Embryos

Information presented concurrently and redundantly to 2 or more senses (intersensory redundancy) has been shown to recruit attention and promote perceptual learning of amodal stimulus properties in animal embryos and human infants. This study examined whether the facilitative effect of intersensory redundancy also extends to the domain of memory. We assessed bobwhite quail chicks' ability to remember and prefer an individual maternal call presented either unimodally or redundantly and synchronously with patterned light during the period prior to hatching. Embryos provided with unimodal auditory exposure failed to prefer the familiar call over a novel maternal call postnatally at 48 hr and 72 hr following exposure. In contrast, embryos provided with redundant, synchronous audiovisual stimulation significantly preferred the familiar call at 48 hr following exposure, but not at 72 hr. A second experiment provided chicks with a single 10‐min refamiliarization with the familiar call at either 48 hr or 72 hr following hatching. Chicks given only unimodal auditory exposure prior to hatching did not appear to benefit from this brief postnatal refamiliarization, showing no preference for the familiar call at either 72 or 96 hr. Chicks that received redundant audiovisual stimulation prenatally showed a significant preference for the familiar call (following the brief reexpo sure 24 hr earlier) at both 72 and 96 hr of age. These results are the first to demonstrate that redundantly specified information is remembered longer and reactivated more easily than the same information presented unimodally. These findings provide further evidence of the salience of intersensory redundancy in guiding selective attention and perceptual learning during early development.     

Maintaining the connection: Parenting as a noncustodial father

The purpose of this study was to identify relevant factors associated with the noncustodial father's frequency of contact with his child following divorce. The findings of the research revealed that a combination of demographic, personal characteristics, and psychosocial factors are related to the father's frequency of contact with the child.     

The social worker as psychoanalyst

This paper examines the development of social workers as psychoanalysts to determine whether psychoanalysis is a legitimate function of social work. Historically, social work has found psychoanalytic theory helpful. However, it is generally understood that for the caseworker to competently practice psychoanalytic psychotherapy, advanced training is necessary. Although many social workers have availed themselves of this opportunity, the profession continues to believe that the practice of psychoanalysis is incompatible with social work. This is based upon an inaccurate conception of psychoanalysis. Since the social work psychoanalyst is concerned with the client's adaptation to the environment, his or her practice can easily be defined as clinical social work.     

Household strategies in the face of resource scarcity in coastal Ghana: are they associated with development priorities?

In many developing regions, women and young girls spend several hours daily in the collection of natural resources. Still the link between these household resource strategies and stakeholder perceptions of development priorities remains unexplored. This project examines this association with survey data representative of the adult population from Ghana’s Coastal Region. Although natural resource scarcity and the sustainability of resource use represent key development challenges, there are others (e.g., energy, sanitation, employment, and educational opportunities). As such, even in the face of natural resource scarcity, individuals may place greater importance on other dimensions of development, especially if household resource strategies are perceived as relatively efficient. The analytical focus here is on water and the results suggest that gender roles shape household water collection strategies, while also shaping these strategies’ perceived opportunity costs. Specifically, Ghanian adults more often see drinking water provision as their primary development need when water sources are distant and/or when male household members collect water (particularly male heads). In the end, I argue that social science inquiry benefits by contextualizing social dynamics within environmental context, particularly within cultural settings in which human subsistence is intimately tied to the state of the natural environment.     

Dilemmas in provision of urban mental health services for latency age children

Urban mental health facilities are increasingly overwhelmed by the sheer number of cases, at a time when federal, state and local funding cutbacks are greater than ever before. Additional to the numbers of cases needing care, is a growing number of cases presenting overwhelming social problems, i.e., emotional and medical pathology, economic deprivation, and substance abuse, with resultant family violence and child abuse. The case-loads in mental health agencies have become almost indistinguishable from those on the roles of child protection, juvenile justice, and child welfare agencies. Mental health service is near to impossible to provide, prior to major environmental manipulation, via educational planning, and frequent placement of children in day treatment programs, day care, or securing of in-home assistance, via home-maker services. These needed referrals take inordinate time, given the unresponsive, poorly coordinated bureaucracies providing such services. Many of the families seen are burdened by overwhelming social pathology, e.g., poverty, huge numbers of children per family, single-parenthood, drugs, and neighborhood violence. Treatment is increasingly difficult to provide, given the poor access to child serving systems, by parents and professionals, alike. Token services and worker burn-out in response to overwhelming difficult cases and excessive assignments, suggest a situation of crisis proportion. Clearly coalitions must be formed by over-burdened professionals, to better educate governing bodies, politicians, boards and administrators, and parents regarding this growing crisis. Professionals, battle-weary, are retreating from agency practice, simultaneous with agency cut-backs of staff and service. Agency administrators are cowed by local and state directives regarding budgetary cuts, and the situation worsens daily, as overburdened line staff struggle with an impossible challenge. Some sort of advocacy and social action must be taken by leaders in the field, to better inform and educate those responsible for budgetary allocations. Latency age children are among the most vulnerable, caught in deteriorating schools and neighborhoods, living with incredible daily violence, and pressures from drug dealers, pushers, adolescent gangs, and inadequate supports in their homes. This group of children is being pushed to become the violent adolescents of tomorrow. Major innovations and changes in delivery of services is necessary in health and mental health agencies serving this at-risk population. Proposed is a school based model of practice to provide access, coordination and collaboration of needed services.This paper was presented at the National Health Policy Forum, National Academies of Practice, April 1992.Ph.D. Specialization in the treatment of Children and Adolescents, Ph.D. Program.