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Results for “Imitative Behavior”

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PubMed2000

Naive chimpanzees' (Pan troglodytes) observation of experienced conspecifics in a tool-using task.

The authors investigated the occurrence of naive chimpanzees' (Pan troglodytes) spontaneous observation of experienced conspecifics during a tool-use task entailing honey fishing. The chimpanzees were presented with 20 kinds of "tools" of which 12 kinds were usable. Six pairs of naive and experienced chimpanzees were brought to this honey-fishing situation. A total of 40 observation episodes occurred between the naive and experienced groups, 34 of which were from naive toward experienced individuals. Naive chimpanzees never observed their partners after their own success but did so after their own failure or before their first attempts. In addition, there were 10 cases in which naive individuals used the left-over tools of the experienced ones. Two factors for the transmission of tool use were clearly evident in this study: (a) spontaneous observation of an appropriate behavioral sequence and (b) enhanced environmental cues made by skilled individuals.

Animals↗
PubMed2004

Catechol O-methyltransferase Val158Met polymorphism in schizophrenia: differential effects of Val and Met alleles on cognitive stability and flexibility.

OBJECTIVE: The catechol O-methyltransferase (COMT) Val158Met polymorphism has been associated with cognitive and behavioral phenotypes in schizophrenia. Whether COMT genotype is beneficial may depend on phenotype definition. The authors examined the effects of COMT genotype on a task that distinguishes imitation from reversal learning. They hypothesized that the Val and Met alleles would be associated with deficits in imitation learning and reversal learning, respectively. METHOD: Twenty-six patients with schizophrenia and schizoaffective disorder completed a task requiring alternation between imitation and reversal rules. RESULTS: Met homozygotes showed better acquisition of the imitation rule but greater deficit shifting from imitation to reversal. Val homozygotes had poorer imitation performance and slower reaction times. CONCLUSIONS: The Met allele, by increasing tonic dopamine, may promote cognitive stability but limit cognitive flexibility.

Adult↗
PubMed1976

Effects of social influence in a recognition task of auditory intensity: a temporary shift in criterion.

The effects of responses of another person or a computer occurring prior to the subjects' responses in tasks to recognition model which assumed that subjects shifted their decision criteria temporarily on each trial. A parameter representing the amount of criterion shift reliably estimated sensitivity to social influence. When the social sensitivity parameter was estimated from the data, discriminative ability, defined as d', was unaffected by the presence of social influence. Principal components analyses suggested that social sensitivity and discriminative ability represented essentially orthogonal components of subjects' decision behavior.

Auditory Perception↗
PubMed1995

Interactional processes in families with disruptive boys: patterns of direct and indirect influence.

Patterns of direct and indirect influence were investigated in interactions among 44 families with disruptive boys. Positive and negative behaviors were assessed for spouses and parent-child dyads, in different laboratory situations. For direct or reciprocal influence, positive behaviors in the father-child dyads were positively correlated; mothers' positive behaviors were positively correlated with boys' negative behaviors, suggesting an unexpected pattern of "inverse reciprocity." For indirect influences, the following associations were found: Fathers' negative behaviors toward their children predicted the children's negative behaviors toward their mothers, and mothers' negative behaviors toward their children predicted the children's negative behaviors toward their fathers, suggesting a form of setting event or displaced behavior pattern. The children's negative behaviors toward their mothers correlated with the fathers' behaviors toward the mothers, suggesting a modeling pattern. These indirect paths underline the relevance of taking into account family interlocked relationships when studying child disruptiveness.

Acting Out↗
PubMed1996

One-session group treatment of spider phobia.

Forty-two patients with spider phobia, fulfilling the DSM-III-R criteria for simple phobia, were assessed with behavioral, physiological and self-report measures. They were randomly assigned to two group treatment conditions: (1) small groups of three to four patients, and (2) large groups of seven to eight patients. They received one 3-hr session consisting of exposure and modeling. The results showed that both conditions yielded significant improvements on almost all measures, and these were maintained or furthered at the 1-yr follow-up. With one exception, there was no difference between the conditions, but on most measures there was a trend for the small group condition to yield better effects. The proportions of clinically significantly improved patients at post-treatment were 82% in the small group and 70% in the large group. At follow-up the corresponding figures were 95% and 75%, respectively. The conclusion that can be drawn is that one-session group treatment is a feasible alternative to individual treatment, yielding almost as good effects.

Adolescent↗
PubMed2005

The role of the family in preventing and intervening with substance use and misuse: a comprehensive review of family interventions, with a focus on young people.

The family plays a key part in both preventing and intervening with substance use and misuse, both through inducing risk, and/or encouraging and promoting protection and resilience. This review examines a number of family processes and structures that have been associated with young people commencing substance use and later misuse, and concludes that there is significant evidence for family involvement in young people's taking up, and later misusing, substances. Given this family involvement, the review explores and appraises interventions aimed at using the family to prevent substance use and misuse amongst young people. The review concludes that there is a dearth of methodologically highly sound research in this area, but the research that has been conducted does suggest strongly that the family can have a central role in preventing substance use and later misuse amongst young people.

Adolescent↗
PubMed2001

Is suicide contagious? A study of the relation between exposure to the suicidal behavior of others and nearly lethal suicide attempts.

This study sought to determine the association between nearly lethal suicide attempts and exposure to the suicidal behavior of parents, relatives, friends, or acquaintances and to accounts of suicide in the media. The authors conducted a population-based case-control study in Houston, Texas, from November 1992 through July 1995. They interviewed 153 victims of attempted suicide aged 13--34 years who had been treated at emergency departments in Houston and a random sample of 513 control subjects. After controlling for potentially confounding variables, the authors found that exposure to the suicidal behavior of a parent (adjusted OR = 1.5; 95% CI: 0.6, 3.6; p = 0.42) or a nonparent relative (adjusted OR = 1.2; 95% CI: 0.7, 2.0; p = 0.55) was not significantly associated with nearly lethal suicide attempts. Both exposure to the suicidal behavior of a friend or acquaintance (adjusted OR = 0.6; 95% CI: 0.4, 1.0; p = 0.05) and exposure to accounts of suicidal behavior in the media (adjusted OR = 0.2; 95% CI: 0.1, 0.3; p = 0.00) were associated with a lower risk of nearly lethal suicide attempts. Exposure to accounts of suicidal behavior in the media and, to a lesser extent, exposure to the suicidal behavior of friends or acquaintances may be protective for nearly lethal suicide attempts, but further research is needed to better understand the mechanisms underlying these findings.

Adolescent↗
PubMed1976

Relational and behavioral interventions with economically disadvantaged toddlers.

Matched groups of children, ages 12-24 months, referred for early social or verbal developmental lags or home-environment problems, participated either in a center-based "relational" or a home-based "behavior modification" intervention. Although both programs accelerated youngsters' intellectual development, there were few differences between groups on the criterion change measures.

Behavior Therapy↗
PubMed2004

Effect of parental R-rated movie restriction on adolescent smoking initiation: a prospective study.

OBJECTIVE: To determine if young adolescents who report that their parents restrict viewing R-rated movies have a lower risk of trying smoking in the future. DESIGN: Prospective observational study. Students from 15 schools in New Hampshire and Vermont, randomly selected from all middle schools with >150 students, were surveyed in 1999. Baseline never-smokers were surveyed again by telephone 13 to 26 months later to determine smoking status. OUTCOME MEASURE: Trying smoking during the follow-up period. RESULTS: The majority of the 2596 students were white, with ages ranging from 10 to 14 years. Nineteen percent reported that their parents never allowed them to view R-rated movies, 29% were allowed once in a while, and 52% were allowed sometimes or all the time. Ten percent of students tried smoking during the follow-up period. Smoking-initiation rates increased as parental restriction of R-rated movies decreased (2.9% for adolescents reporting that their parents never allowed them to view R-rated movies, 7.0% for those allowed to view them once in a while, and 14.3% for those allowed to view them sometimes or all the time). There was a strong and statistically significant effect of parental R-rated movie restriction on adolescent smoking even after controlling for sociodemographics, social influences (friend smoking, receptivity to tobacco promotions), parenting style (maternal support and control, parental disapproval of smoking), and characteristics of the adolescent (school performance, sensation seeking, rebelliousness, self-esteem). Compared with adolescents whose parents never allowed them to view R-rated movies, the adjusted relative risk for trying smoking was 1.8 (95% confidence interval [CI]: 1.1, 3.1) for those allowed to watch them once in a while and 2.8 (95% CI: 1.6, 4.7) for those allowed to watch them sometimes or all the time. The effect was especially strong among adolescents not exposed to family (parent or sibling) smoking, among whom the adjusted relative risk for smoking was 4.3 (95% CI: 1.4, 13) for those allowed to view R-rated movies once in a while and 10.0 (95% CI: 3.6, 31) for those allowed to view them sometimes or all the time. CONCLUSIONS: Parental restriction from watching R-rated movies strongly predicts a lower risk of trying smoking in the future. The effect is largest among adolescents not exposed to family smoking. By exerting control over media choices and by not smoking themselves, parents may be able to prevent or delay smoking in their children.

Adolescent↗
PubMed1997

Presurgical and postsurgical mental and psychomotor development of infants with sagittal synostosis.

OBJECTIVE: The current study compared the mental and psychomotor development of infants with nonsyndromic sagittal synostosis (SS) with a demographically matched comparison group without congenital defects. Within the SS group, we tested the hypothesis that age of cranial release would be inversely correlated with mental development. DESIGN: The design was prospective and longitudinal. Participants were assessed at 4, 12, and 24 months of age. SETTING: The study was conducted in a craniofacial clinic at an urban children's hospital. PARTICIPANTS: Participants were 19 infants with SS (consecutive craniofacial program referrals) and 19 demographically matched comparison infants recruited from the community. One infant with SS did not attend the 24-month assessment. MAIN OUTCOME MEASURES: Mental and Psychomotor Indices from the Bayley Scales of Infant Development were the primary outcome measures. Subdomains of development were created using Kohen-Raz scoring procedures. All measures were determined a priori. RESULTS: Repeated-measures MANOVAs revealed no statistically significant differences in the developmental trajectories of the two groups. None of the SS group infants received Mental Development Index (MDI) scores in the mentally retarded or borderline range of intellectual functioning (i.e., below 78). An inverse correlation (r = -.30) was found between the age at surgery and Bayley growth curve coefficients; however, this association was not statistically significant (p = .10, one-tailed). CONCLUSIONS: Results are consistent with previous studies of the mental and psychomotor development of infants with nonsyndromic craniosynostoses in relation to normative test data. The relation between surgery age and developmental outcome merits further study in a larger sample with a greater range of surgery ages.

Age Factors↗