Control of responding by a conditioned reinforcer in the presence of free food

It has been reported that animals will “work” in preference to “freeloading.” However, the variables responsible for this phenomenon are not well understood. Two pigeons were trained to keypeck for food on a fixed-ratio 300 schedule. Next, the food hopper was propped up to permit continuous access to food, and the presence or absence of the hopper light was manipulated. When the hopper light was presented contingent upon the fixed-ratio schedule, keypecking occurred; when it was not presented, keypecking ceased. Thus, responding in the presence of free food was shown to be a function of the conditioned reinforcing properties of the hopper light.     

Visual reinforcement: Operant acquisition in the presence of a free mirror

In Experiment I Siamese fighting fish performed operant responses that produced a mirror image to which the fish could display; consistent detectable display was not necessary for maintenance of operant performance. In Experiment II fish acquired and continued to perform an operant response that produced a mirror, although a “free” mirror was continually present; display rate to the contingent mirror increased while display rate to the “free” mirror was decreasing. An interpretation of these and previous data in terms of sensory reinforcement is suggested.     

Experience with the reinforcer and the preference for earned rather than free reinforcers in rats

Manipulating experience with the reinforcer, through either home cage presentations of Noyes pellets or availability of the free reinforcer immediately prior to testing, attenuated the preference for earned as opposed to free reinforcers. Similarly, changing the reinforcer to one of a different flavor at testing increased the preference for the noncontingent reinforcer. These results are consistent with an interpretation of earned reinforcer preference which emphasizes the role of the reinforcer as a discriminative signal for further instrumental responding. It is suggested that the tendency to perform instrumental responses for reinforcers when free reinforcers are available can be explained in terms of traditional learning processes.     

Mothers in methadone treatment and their involvement with the child protection system: A replication and extension study

Objectives

Although a high level of involvement with the child protection system has been identified in families where parental substance use is a feature, not all such parents abuse or neglect their children or have contact with the child protection system. Identifying parents with substance-use histories who are able to care for their children without intervention by the child protection system, and being able to target interventions to the families who need them the most is important. This study interviewed a relatively large sample of mothers about their histories, their children and their involvement with the child protection system. We hypothesized that mothers in opioid pharmacological treatment who are involved with child protection services are different in characteristics to those mothers who are not involved.

Methods

One hundred and seventy-one women, with at least one child aged under 16 years, were interviewed at nine treatment clinics providing pharmacological treatment for opioid dependence across Sydney, Australia.

Results

Just over one-third of the women were involved with child protection services at the time of interview, mostly with children in out-of-home care. Logistic regression analyses revealed that factors which significantly increased the likelihood of the mother being involved with the child protection system were: (1) having a greater number of children, (2) being on psychiatric medication, and (3) having less than daily contact with her own parents.

Conclusions

This study replicates and extends the work of Grella, Hser, and Huang (2006) and the limited literature published to date examining the factors which contribute to some substance-using mothers becoming involved with the child protection system while others do not. The finding that mental health problems and parental supports (along with the number of children) were significantly associated with child protection system involvement in this study, indicates a need for improved interventions and the provision of treatment and support services if we are to reduce the involvement of the child protection system with these families.     

The gender of the extension agent and farmers' access to and participation in agricultural extension in Nigeria

Abstract

A study was conducted to determine the effectiveness of male and female extension agents in reaching farmers, especially women, with extension services in Nigeria. Specially the study determined the levels of awareness of and participation in extension activities, adoption of and technical knowledge of recommended agricultural technologies/practices, satisfaction with the quality of extension services provided and agents' credibility of men and women farmers under male and female extension agents supervision. Data gathered from 141 men and 72 women farmers supervised by male agents and 22 men and 93 women farmers supervised by female agents in Oyo, Kaduna and Rivers State Agricultural Development Projects in Nigeria form the empirical basis for the study. Even though men farmers are more aware of and participated more in the extension activities organised by agents than women farmers, the study shows that women farmers, who are supervised by female agents have more access to extension services than women farmers who work with male agents. Specifically, women farmers, who had females for extension agents had relatively higher levels of awareness and participation of the extension activities organised, adoption of and technical knowledge of recommended technologies/practices and satisfaction with the quality of agents' services and credibility. These differential effects of female and male agents on women's access to extension are significant for the delivery of extension services to women farmers, especially. Extension organisations must encourage and recruit more females for extension work done at the same time evolve strategies that will help male agents to work better with women farmers.     

Robust effects of the efficacy of explicit failure-driven scaffolding in problem-solving prior to instruction: A replication and extension

Although Productive Failure has shown to be effective (Kapur, 2016; Loibl, Roll, & Rummel, 2017), it is not clear if failure in problem-solving is necessary. Initial work in a quasi-experimental setting suggests that explicitly designing for experiences of failure leads to better learning outcomes than designing for success. We build on this to report on a controlled experimental study where students are exposed to failure-driven, success-driven, or no explicit scaffolding in problem-solving prior to instruction. For assessments of non-isomorphic conceptual understanding, our results align with those from prior work. Despite the similarity in posttest scores, students exposed to failure-driven scaffolding demonstrate higher quality of constructive reasoning than those receiving success-driven scaffolding. Additionally, our study reveals learning benefits of failure-driven scaffolding (for both posttest scores and reasoning quality) on assessments of transfer. Several cognitive, affective and meta-cognitive mechanisms are investigated to explain robust learning benefits of failure-driven scaffolding in preparatory problem-solving.     

Instrumental responding by rats on free-operant schedules with components that schedule response-dependent reinforcer omission: Implications for optimization theories

In two experiments, we assessed whether rats optimize the number of reinforcers per response. In Experiment 1, one group of rats was trained to leverpress for food reinforcement on a simple variable-interval (VI) 60-sec schedule. For another group, a negative fixed-ratio component was imposed on the VI schedule to produce a conjoint contingency in which reinforcement became available on the VI schedule but was omitted when the ratio criterion was satisfied. In Experiment 2, one group of rats responded on a VI schedule and also received response-independent food. For another group, responding above a certain rate canceled the response-independent food. Despite the negative contingency experienced by the groups in Experiments 1 and 2, responding was maintained at a level at which the number of obtained reinforcers was reduced substantially below the maximum number possible. In addition, in both experiments, the groups that experienced the negative contingency responded at a lower rate than did a yoked control group that experienced the same frequency of reinforcement but lacked the negative component. These results demonstrate that although rats do not optimize their behavior with respect to reinforcement, they are nevertheless sensitive to some aspect of the instrumental contingency in operation.     

Characteristics of effective leadership networks: a replication and extension

Purpose: Replicating and extending earlier research, this mixed-methods study inquired about the characteristics of effective school leadership networks and the contribution of such networks to the development of individual and collective leaders’ professional capacities.

Design: The study used path analytic techniques with survey data provided by 283 school and district leaders to test a path model of effective network characteristics. Interview data were provided by 23 school leaders. Variables in the model included Network leadership, structure, health, connectivity, and outcomes.

Findings: Results confirmed that the model was a very good fit with the data and, as a whole, explained 51% of the variation in network outcomes. Network leadership had the largest total effect on network outcomes, followed closely by the effects of Network Health and Network Connectivity. Interview data confirmed the nature of variables measured by the survey and added additional features for future research. Most results replicated the previous study.

Research Limitation: The study was limited to leadership networks intentionally organised within districts, not networks organised by school leaders themselves or networks arising spontaneously by their members. Results cannot be generalised to other types of networks.

Practical implication: In addition to a focus on single unit leadership development in districts, systematic initiatives should be designed to help prepare network leaders to foster the forms of collaboration that are so central to professional capacity development.

Originality: Results of the study offer explicit guidance to network leaders about how to improve the contribution of network participation to their colleagues’ capacities; it is one of a very small number studies in educational contexts to provide such guidance.     

Negative parental attributions mediate associations between risk factors and dysfunctional parenting: A replication and extension

The primary goal of the current study was to replicate our previous study in which was found that negative maternal attributions mediate the association between parenting stress and harsh and abusive discipline. In addition, we investigated this association in fathers, and added observational parenting data. During two home visits mothers and fathers were observed with their children (age 1.5–6.0 years), filled in questionnaires, and completed the Parental Attributions of Child behavior Task (PACT; a computerized attribution task). Similar to our previous study, negative parental attributions mediated the relation between parenting stress and self-reported harsh and abusive parenting for both mothers and fathers. For mothers, this mediation effect was also found in the relation between parenting stress and lower levels of observed supportive parenting in a challenging disciplinary task. In addition, the relation of partner-related stress and abuse risk with harsh, abusive, and (low) supportive parenting were also mediated by maternal negative attributions. When parenting stress, partner-related stress, and abuse risk were studied in one model, only parenting stress remained significant. Results are discussed in terms of the importance of targeting parental attributions for prevention and intervention purposes in families experiencing stress.     

Operant Conditioning in the Classroom Setting: A Review of the Research

Abstract

The purposes of this review were (a) to summarize the research following an applied behavioral analysis which has relevance for public school classrooms and (b) to discuss the problems and important considerations involved in an applied behavioral analysis of classroom behavior. Studies in this area are grouped into the following categories according to the nature of the reinforcement employed and assessed: (a) teacher attention, (b) peer attention, (c) token reinforcement, and (d) vicarious reinforcement. The problems of obtaining teacher cooperation, valid and reliable measurements, and confirmation of stimulus control through design of the experiment were discussed. Finally, the implications of these studies for classroom behavior control, as well as for future research, were explored     

Otitis media,the quality of child care,and the social/communicative behavior of toddlers: A replication and extension

The purpose of this study was to examine the effects of otitis media (OM) and the quality of child care on the social and communicative behaviors of toddlers, using a cumulative risk framework that included moderation. The study followed 72 children who began child care in infancy. Both process and structural aspects of the quality of 11 child care centers were measured and children received weekly ear examinations from the time they entered child care. At 24 months of age children were observed in their classrooms during free play when they were well. Children in the chronic OM, low quality care group exchanged more negative gestures with peers, initiated less verbally to teachers and peers and were talked to less by teachers and peers in comparison to all other children. The results suggest the importance of the moderating effect of the quality of child care in understanding the effects of OM on social/communicative development.     

School principals and racism: responding to Aveling

This study responds to Nado Aveling's call in ‘Anti-racism in Schools: A question of leadership?’ (Discourse: Studies in the Cultural Politics of Education, 2007, 28(1), 69–85) for further investigation into racism in Australian schools. Aveling's interview study concluded that an overwhelming number of school principals denied the presence of racism in their schools, and that there were no discernible differences in how principals in different schools constructed racism. In contrast, our research found that school principals' constructions of cultural racism are strongly influenced by their school contexts. We elucidate these differences examining the various intersections between race, class and religion deployed by principals in different sites, and argue for the utility of examining and theorising cultural racism using an intersectional approach. By bringing context into our analysis we provide a more nuanced insight into the different ways in which racism is constituted and understood by Australian school principals.     

Disentangling the mental health impact of childhood abuse and neglect: A replication and extension study in a Brazilian sample of high-risk youth

Childhood maltreatment is a key predictor of mental health problems across the life span. Yet, how maltreatment types independently and jointly influence the risk for psychiatric problems remains unclear. The aim of the study was two-fold: first, to replicate recent findings regarding the impact of maltreatment types on youth psychiatric symptoms, based on a Brazilian sample of high-risk adolescents (n = 347; age range = 11–17 yrs), and second, to extend existing findings by examining whether this relationship is mediated by bullying victimization and/or perpetration. Measures included self-report ratings of childhood maltreatment and peer victimization, as well as multi-informant reports of internalizing and externalizing symptoms. Consistent with prior research, we found that: (i) maltreatment types often co-occurred; (ii) there was a linear association between number of maltreatment types experienced and symptom severity (i.e. cumulative effect); and (iii) emotional abuse emerged as the most consistent independent predictor of poor mental health across domains, raters, and gender. Additionally, this study extends previous findings by showing that the influence of maltreatment on psychiatric outcomes is partially mediated by peer victimization, but not by bullying perpetration. In conclusion, these findings expand our understanding of the heterogeneity in individual responses to maltreatment as well as highlighting emotional abuse as an important predictor of poor mental health.     

Tutor learning: the role of explaining and responding to questions

Previous research on peer tutoring has found that students sometimes benefit academically from tutoring other students. In this study we combined quantitative and qualitative analyses to explore how untrained peer tutors learned via explaining and responding to tutee questions in a non-reciprocal tutoring setting. In support of our hypotheses, we found that tutors learned most effectively when their instructional activities incorporated reflective knowledge-building in which they monitored their own understanding, generated inferences to repair misunderstandings, and elaborated upon the source materials. However, tutors seemed to adopt a knowledge-telling bias in which they primarily summarized the source materials with little elaboration. Tutors’ reflective knowledge-building activities, when they occurred, were more frequently elicited by interactions with their tutee. In particular, when tutees asked questions that contained an inference or required an inferential answer, tutors’ responses were more likely to be elaborative and metacognitive. Directions for future research are also discussed.     

The Improvement of Thinking Skills in Young Children using Computer Activities: a replication and extension

Summary In a replication and extension of a study by Riding & Powell (1985), 60 four‐year‐old nursery class children were given the Raven's Coloured Progressive Matrices and were then randomly divided within sexes into two groups. A treatment group worked through 16 computer presented problem solving activities and where necessary received coaching. A control group did not do the problems, but spent the time on their normal nursery class activities. All the children were then re‐tested on Raven's Matrices. The results showed a significantly greater improvement between the pre‐ and post‐test scores for the treatment group than for the control group: The results were similar to those obtained in the previous study and suggest that a worthwhile improvement in thinking performance in young children can be obtained.