Effects of ethanol on multiple fixed-interval fixed-ratio schedule performances: dynamic interactions at different fixed-ratio values.

Key pecking by three pigeons was maintained under a multiple fixed-interval fixed-ratio schedule of food presentation. The fixed-interval value remained at 3 minutes, while the fixed-ratio size was increased systematically in 30-response increments from 30 to either 120 (two pigeons) or 150 (one pigeon). At least two lower fixed-ratio values were also redetermined. The effects of ethanol (5 to 2.5 g/kg) were assessed at each of the different schedule parameters. Both overall and running response rates under the fixed-ratio schedule decreased with increases in the size of the fixed-ratio schedule; pause duration under the fixed-ratio schedule was directly related to increases in fixed-ratio size. Overall and running rates of responding under the fixed-interval schedule changed little with increases in the size of the fixed-ratio schedule. Despite the relative invariance of fixed-interval responding across the different fixed-ratio values, the effects of ethanol on responding under the fixed-interval schedule differed depending on the size of the fixed-ratio schedule. Greater increases occurred in both overall and in lower local rates of responding under the fixed-interval schedule when the fixed-ratio value was 120 or 150. The effects of ethanol on responding under the fixed-ratio schedule also depended on the size of the fixed ratio. Increases in responding under the fixed-ratio schedule were typically greater at the higher fixed-ratio values where response rates were lower. When the effects of ethanol were redetermined at the lower fixed-ratio parameter values, rates and patterns of responding were comparable to those obtained initially. However, the dose-effect curves for responding under both fixed-ratio and fixed-interval schedules were shifted up and to the right of those determined during the ascending series. The effects of ethanol can depend on rate or responding, behavioral history, and the context in which behavior occurs.     

SCHEDULE-INDUCED DRINKING: ELICITATION,ANTICIPATION, OR BEHAVIORAL INTERACTION?

We carried out five experiments with rats on fixed-time schedules in order to define the relation between drinking and individual food-pellet presentations. In Experiment 1, unsignaled extra food occurred at the end of occasional fixed intervals, and we compared subsequent drinking patterns with drinking before the extra food presentation. In Experiment 2 we presented signaled and unsignaled extra food and measured elicited and anticipatory drinking patterns. In Experiment 3, we observed the persistence of modified drinking patterns when several consecutive intervals ended with extra pellets. In Experiments 4 and 5, we varied the magnitude of food delivery across (rather than within) sessions to replicate published findings. Results show that schedule-induced drinking is neither elicited by food presentations nor induced by stimuli associated with a high food rate. All subjects seemed to follow a simple rule: during any stimulus signaling an increase in the local probability of food delivery within a session, engage in food-related behavior to the exclusion of drinking. Schedule-induced drinking appears to be the result of dynamic interactions among food-related behavior, drinking, and other motivated behavior, rather than a direct effect of the contingencies of food reinforcement.     

Further analysis of the separate and interactive effects of methylphenidate and common classroom contingencies

We evaluated separate and interactive effects between common classroom contingencies and methylphenidate (MPH) on disruptive and off-task behaviors for 4 children with a diagnosis of attention deficit hyperactivity disorder. Analogue conditions consisting of contingent teacher reprimands, brief time-out, no interaction, and alone were conducted in a multielement design. Medication status (MPH or placebo) was alternated across days in a superordinate multielement design. Results indicate that (a) the behavioral effects of MPH were influenced by one or more of the analogue conditions for each participant, and (b) time-out was associated with zero or near-zero levels of both disruptive and off-task behavior for 3 of the 4 participants during MPH and placebo conditions. Implications for the clinical effectiveness of MPH and possible behavioral mechanisms of action of MPH in applied settings are discussed.     

The Development of Family Loyalty and Relational Ethics in Children

Despite little research investigating how family loyalty and relational ethics develop in children, theorists suggest that children's early family loyalty experiences play a significant role in their future relationships. Twenty-four children, ages 5–10 years, were interviewed to examine developmental trends in children's conceptualizations of family and family loyalty and their reasoning through parent-child ethical dilemmas. Results indicate (a) younger children possess a simpler, more concrete schema for family and family loyalty than do older children and (b) younger children are less able than older children to adopt their parents' perspectives in reasoning through ethical dilemmas.A psychotherapist with T. W. Ponessa & Associates     

A comparison of peer verbal responding directed toward adolescents with behavioral disorders and nonhandicapped peers

One of the primary intents of inclusion is the maximization of interaction between persons with and without disabilities. The purpose of this study was to analyze the verbal responding that peers directed toward adolescents with behavioral disorders and, to this effect, several comparisons were made: verbal responding of peers directed toward adolescents with behavioral disorders was compared to verbal responding of peers directed toward regular class adolescents; verbal responding of peers directed toward the same adolescents with behavioral disorders was compared across their self-contained and integrated settings; and verbal responding of peers directed toward adolescents with behavioral disorders in integrated settings was compared to verbal responding of peers directed toward regular class adolescents. Data, collected in real time using portable microcomputers, focused on positive, negative, and neutral social responding and positive, negative, and neutral academic responding. All verbal responding of peers directed toward 14 adolescents with behavioral disorders and 14 regular class peers was recorded. Data were analyzed by group and setting, as well as by social or academic content. Results of the study support inclusion, with high levels of peer responding directed toward adolescents with behavioral disorders in integrated classrooms. Almost all peer responding was positive or neutral in content. Results were discussed as they related to placement of students, social skills training, and previous research.     

TEACHING CHOICE MAKING DURING SOCIAL INTERACTIONS TO STUDENTS WITH PROFOUND MULTIPLE DISABILITIES

We taught 4 students with profound multiple disabilities to use a microswitch communication system to request a change in recreational stimuli during social interactions with nondisabled peers. In Study 1, we conducted a preference assessment across a range of stimuli for each student. The most and least preferred stimuli were incorporated into microswitch communication system training in Study 2. During the second study, 3 of the 4 students (a) learned to use the microswitch communication system to control stimulus presentation, (b) more clearly differentiated their time among stimuli, and (c) increased their level of general alertness. Study 3 extended the use of the microswitch communication system to social interactions with nondisabled peers. Two students were more engaged in interactions when they chose when to change stimuli; 1 student was more alert when a peer chose when to change activities; a 4th student showed an undifferentiated pattern. The outcomes of the investigation are discussed in terms of the effects of controlling stimulus presentation on the behavior of students with profound multiple disabilities and the stability of preference hierarchies over time.     

Reversibility of single-incentive selective associations.

Rats were trained to press a lever in the presence of a tone-light compound stimulus and not to press in its absence. In each of two experiments, schedules were designed to make the compound a conditioned punisher for one group and a conditioned reinforcer for the other. In Experiment 1, one group's responding produced food in the presence of the compound but not in its absence. The other group's responding terminated the compound stimulus, and food was presented only in its absence. When tone and light were later presented separately, light controlled more responding than did tone in the former group, but tone gained substantial control in the latter. The same effects were also observed within subjects when the training schedules were switched over groups. In Experiment 2, two groups avoided shock in the presence of the compound stimulus. In the absence of the compound, one group was not shocked, and the other received both response-independent and response-produced shock. When tone and light were presented separately, the former group's responding was mainly controlled by tone, but the latter group's responding was almost exclusively controlled by light. These effects were also observed within subjects when the training schedules were switched over groups. Thus, these single-incentive selective association effects (appetitive in Experiment 1 and aversive in Experiment 2) were completely reversible. The schedules in which the compound should have been a conditioned reinforcer consistently produced visual control, and auditory control increased when the compound should have become a conditioned punisher. Currently accepted accounts of selective associations based on affinities between shock and auditory stimuli and between food and visual stimuli (i.e., stimulus-reinforcer interactions) do not adequately address these results. The contingencies of reinforcement most recently associated with the compound and with its absence, rather than the nature of the reinforcer, determined whether auditory or visual stimulus control developed.     

Variability in parenting behaviours during play and during mealtimes with toddlers

Few empirical studies have explored variability in parenting behaviours observed in a mealtime setting as well as in a play setting with young children. We analysed data from 282 parent–toddler dyads who participated in the Play & Grow study in the United States in 2017–2019. Parent–child interactions were video recorded during play in the laboratory when the child was 18 months old and then during mealtime in the home 6 months later. Standardised coding procedures were used to rate parenting behaviours (sensitivity, cognitive stimulation, positive regard, detachment, intrusive control and negative regard). We describe correlations and differences and variability in parenting behaviour between the two assessments and relative to child sex, gestational age, parent education level, household composition and household income. Detachment was lower on average during play at 18 months compared to during mealtime at 24 months (Cohen's d = −0.40), and the other five parenting behaviours were greater on average during play than during mealtime (d = 0.18–0.43). Sociodemographic characteristics were unrelated to the magnitude of individual differences across contexts in any of the parenting behaviours. Implications for research on associations between parent–child interactions and risk for childhood obesity are discussed.     

Women's social experiences before and during the COVID-19 pandemic: A 3-part measurement burst study among women in midlife with health risks

Women in midlife (ages 40–60) with elevated risk for cardiovascular disease (CVD) often rely on social networks during times of high stress. Precautions against the spread of COVID-19—particularly stay-at-home-orders—could have limited positive social experiences during a stressful time, but also could have reduced unwanted negative social experiences. This report presents findings from an ecological momentary assessment study that used 3 bursts of 5 surveys per day for 5 days, to test for changes in women's social experiences: prior to COVID-19 (2019), during stay-at-home-orders (April-May 2020), and during initial reopening (August-September 2020). Participants were women aged 40–60 with one or more CVD risk factors (e.g., hypertension; N = 35, M_Age = 51, M_BMI = 32.2 kg/m²). Momentary reports showed that the number of positive interactions experienced in daily life did not significantly change from before to during the pandemic; positive interactions were more variable during stay-at-home orders than pre-COVID, but rebounded by initial reopening (to pre-COVID levels). In contrast, the number of negative social interactions and social comparisons decreased from before COVID to stay-at-home orders, and remained lower during initial reopening; these experiences were also less variable during stay-at-home orders and initial reopening than before COVID-19. Thus, in a vulnerable group of women with health risks, there is little evidence that social experiences worsened during the first 6 months of the COVID-19 pandemic; decreases in (potentially) negative social experiences may be a small but beneficial side effect of short-term public health precautions.     

Changes in patterns of Early Mother-Child Interaction: A longitudinal study of the first 18 months of life

ObjectiveThe main objective of the present longitudinal study is to describe the progression of early adult-child interactions between the first and second years of life. Changes identified in interactions are described, focusing on both the qualitative aspects of maternal responses, as well as maternal response latency to the child's behavior using a microanalytical methodology that collected data on maternal and child behavior in real-time without losing sight of the temporal dimension.ParticipantsThis study examined 52 mother-child dyads from intact families that presented no psychological, social, or biological risk factors at 6, 12 and 18 months of age.InstrumentCITMI-R (early mother-child interaction coding system, revised edition) was used to assess early mother-infant interactions during free play sessions between mother and child the.ResultsThe results indicate that some components of maternal sensitivity improve as children progress towards the second year of life, detecting an increase in sensitive maternal behavior and a decrease in intrusive behavior in the evolutive observed period; moreover, regarding latency of maternal response, we observed that mothers of older children give more time for their children to explore, which stimulates autonomy. Finally, the implication of these results for intervention directed to optimizing early adult-child interactions are addressed.