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PubMed1975

Effects of penfluridol and other drugs on apomorphine-induced stereotyped behavior in monkeys.

The effects of some drugs on apomorphine-induced stereotyped behavior were studied in male cynomolgus monkeys. Apomorphine produced the dose-dependent stereotyped behavior characterized mainly by continuous licking and biting, and repetitive movements of the hands, head and body in the monkeys. Penfluridol as well as haloperidol showed a clear antagonistic effect on the apomorphine-induced stereotyped behavior, while chlorpromazine was less antagonistic than haloperidol. The antagonistic effect of penfluridol lasted longer than that of haloperidol. Reserpine did not inhibit the apomorphine-induced stereotyped behavior though the drug elicited markedly the behavioral depression and alpha-methyl-p-tyrosine also did not block the stereotyped behavior. Nialamide did not depress the apomorphine-induced stereotyped behavior. In provoking the stereotyped behavior in monkeys, apomorphine probably acts directly on dopamine receptors in the extrapyramidal system, and penfluridol is suggested to act as a dopamine receptor blocker with a long action. The results indicate that protection against apomorphine-induced stereotyped behavior in monkeys may be a useful method for evaluating neuroleptic drugs.

Animals↗
PubMed1991

Stereotypic behavior and heart rate in pigs.

Heart rate responses to feeding of both loose-housed and tethered sows, some of which engaged in persistent behavioral stereotypies, were recorded telemetrically in order to determine if stereotypic behavior occurs in response to, and serves to reduce increased sympathetic nervous activity. Heart rates rose in response to feeding (after which stereotypic behavior is most common) and this was greater for tethered sows. This response was partly blocked by a beta-adrenoreceptor antagonist (carazolol), but not by naloxone, although the latter tended to lead to overall increases in heart rate. Thus long-term tethering of sows leads to greater sympathetic nervous responses to feeding. No consistent relationships were found between heart rate and the performance of stereotypic behavior. In Experiment 1, using sows tethered for 6-8 months, neither basal heart rates nor heart rates following naloxone or carazolol differed between high- and low-stereotyping sows. In Experiment 2, using sows tethered for 1-2 months, high-stereotyping sows had lower basal heart rates than low-stereotyping sows. Marked reductions in heart rate caused by a beta-adrenoreceptor blocker did not lead to any change in stereotypic behavior, and preventing stereotypic behavior led to a reduction not an increase in heart rates. The results suggest that stereotypies are performed in situations where heart rate is high, but they provide no evidence that stereotypies reduce this heart rate.

Adrenergic beta-Antagonists↗
PubMed2002

Environmental enrichment: effects on stereotyped behavior and regional neuronal metabolic activity.

The present study evaluated whether environmental enrichment-related effects on the development of stereotyped behavior in deer mice were associated with alterations in neuronal metabolic activity. Deer mice were reared under either enriched or standard housing conditions for 60 days following weaning. All mice were then placed in automated photocell detectors and classified as either stereotypic or non-stereotypic. Neuronal metabolic activity was then assessed using cytochrome oxidase (CO) histochemistry. The results demonstrated that environmental enrichment significantly increased neuronal metabolic activity in the motor cortex. Furthermore, non-stereotypic mice exhibited significantly more CO activity than stereotypic mice in the cortex, striatum, nucleus accumbens, thalamus, hippocampus and amygdala. This latter effect was due to the enriched mice as evidenced by a significant interaction between housing condition and behavioral status in the cortex, striatum, nucleus accumbens, thalamus and hippocampus. Thus, the observed increase in CO activity reflected increased neuronal metabolic activity in non-stereotypic enriched mice relative to stereotypic enriched mice. These results suggest that, in a developmental model of spontaneous stereotypy, the enrichment-related prevention of stereotyped behavior is associated with increased CO activity.

Animals↗
PubMed1999

Stereotyped behaviours in blind children.

Stereotyped behaviours occur frequently in blind children. Most authors attribute stereotyped mannerisms to factors such as hospitalisation, motor limitations, and reduced capacity for exploration. There seems to be a specific association between blindness and behavioural mannerisms, such as eye pressing and eye poking, which have been observed in children with peripheral blindness. We studied the prevalence of stereotyped motor behaviours in a sample of congenitally blind children with and without other neurodevelopmental disabilities in order to assess the types and features of such stereotyped behavioural traits. Twenty-six congenitally blind children (11 male and 15 female) were assessed through videotape recording and through a questionnaire focusing on the type, frequency, form of manifestation and duration of the children's stereotyped behaviours. Stereotyped behavioural traits were observed in 19 (73%) of the patients. Stereotyped behaviours most frequently observed were body rocking (8; 30.7%), repetitive handling of objects (8; 30.7%), hand and finger movements (7; 26.9%), eye pressing and eye poking (8; 30.7%), and lying face downwards (6; 22.8%) and jumping (3; 11.4%). We found that a reduction in stereotyped behavioural traits could be obtained by stimulating appropriate adaptive behaviour in children, while these behaviours were increased by restricted environmental conditions, reduced sensory stimulation and reduced motility.

Blindness↗
PubMed2002

The effects of stereotype suppression on psychiatric stigma.

The effects of stereotype suppression on psychiatric stigma were investigated in two studies. In experiment 1, 52 participants were presented with a photograph of someone labeled with schizophrenia and instructed to write a passage describing a day in that person's life. Half of the participants were instructed to avoid using schizophrenia-related stereotypes in their passages (the stereotype suppression condition). Participants were then presented with a photograph of a different individual labeled with schizophrenia and asked to write another passage with stereotype suppression instructions omitted. The results showed that while stereotype suppression occurred for the first passage, the expected rebound effects were not observed in the second passage. Furthermore, the results were unchanged when participants' prior experience with persons with mental illness was considered. In a second study, the effects of stereotype suppression on behavior (i.e. seating distance from a person with schizophrenia) were examined in 58 participants. While the stereotype suppression instructions resulted in less stereotypical passages, replicating the results of study 1, no rebound effects on behavior were observed. A non-significant trend was observed whereby previous contact with persons with mental illness was associated with less social distance from someone with schizophrenia. Implications of the findings for reducing psychiatric stigma are discussed.

Adult↗
PubMed2003

The function of stereotypes in visual perception.

Human vision is a product of both physiological and cultural dispositions. This cultural study investigates the role of cultural dispositions in visual perception. In particular, the study focuses on the role of stereotypes, which are involved in recognition. I propose that stereotypes are essential for basic functions of perception and human perception. However, stereotypes also introduce significant limitations on human experience. The fact that stereotypes are abstract simplifications of realities is not the limiting factor, since scientific and cultural progress continually refines stereotypes. The very principle of the stereotype appears to introduce the limitation, because the process of forming stereotypes requires both temporal and functional fragmentations of the continuum of our perception. This fragmentation can be a cause of sensory overload, a postmodern condition that generates cultural, perceptual and behavioral problems. To address this problem, I propose a cultural modification to our modality of perception. The modification shifts the emphasis of our perception from the recognition of stereotypes to the recognition of flows, processes and durations. References to the work of Henri Bergson and Martin Heidegger provide the philosophical basis for this modification and several empirical and experimental examples illustrate such modifications in practice.

Culture↗
PubMed1996

Development and mental representation of stereotypes.

A mixed model of stereotype representation was tested. Experiment 1 examined the development of stereotypes about novel groups. Results showed that, at low levels of experience, stereotypic group knowledge is derived from information about particular group exemplars. However, as experience increases, an abstract group stereotype is formed that is stored and retrieved independently of the exemplars on which it was based. Results of Experiment 2 suggest that preexisting stereotypes about well-known groups are represented as abstract structures in memory. These results indicate that stereotypical knowledge is most likely to be exemplar-based in the absence of abstract stereotypes. The implications of these findings for other aspects of stereotyping and social perception are discussed.

Adult↗
PubMed1997

When exceptions prove the rule: how extremity of deviance determines the impact of deviant examples on stereotypes.

The authors examined how the extent to which counterstereotypic individuals deviate from perceivers' stereotypes affects their impact on these stereotypes and found that extremely deviant group members provoke less stereotype assimilation than do moderately deviant ones. Extremely deviant examples can even provoke boomerang effects, that is, enhance the very stereotype that they violate. When participants whose prior stereotype were moderate or extreme were exposed to moderately or extremely deviant examples, the deviant examples' impact on stereotypes depended both on their extremity and on the extremity of perceivers' prior stereotypes. Boomerang effects were obtained only for extreme-stereotype participants exposed to extremely deviant examples and were mediated by perceptions of the typicality of the deviant examples. Open-ended explanations revealed that the atypicality of extremely deviant examples was used as grounds for dismissing them.

Adult↗
PubMed2002

The dynamic time course of stereotype activation: activation, dissipation, and resurrection.

Stereotypes activated upon initial exposure to a stereotyped individual may dissipate as the exposure continues. Participants observing a videotaped interview with a Black person showed activation of the stereotype of Black people following 15 s of observation but not following 12 min of observation. However, the discovery of a disagreement with the stereotyped individual may bring the dissipated stereotype back to mind. Participants who discovered, at the end of a 12-min videotaped interview with a Black person, that this person disagreed with them about the verdict in a court case showed activation of the stereotype of Black people, whereas participants who discovered instead that the Black person agreed with them did not. Participants who disagreed with a Black person also applied the Black stereotype to him, but this stereotype application was detected only on an implicit measure of application, not on an explicit measure.

Black or African American↗
PubMed1997

Stereotyping of older adults: the role of target facial cues and perceiver characteristics.

This 2-part study used photograph-age and photograph-stereotype sorting tasks to examine the role of target facial cues in stereotyping of older persons. As predicted, young, middle-aged, and older participants associated photographs of those who looked older and those with a neutral facial expression with fewer positive stereotypes than other photographs. Participants also selected fewer positive stereotypes for photographs of women than of men, except when the photographs showed old-old (80 years and over) men. Participant age affected stereotyping only of the photographs of old-old persons, with older participants selecting fewer positive stereotypes for those photographs than middle-aged and young participants. These results establish the importance of facial cues in the age stereotyping process and suggest age boundaries for positive stereotypes of men and women.

Adolescent↗
PubMed1990

Multiple stereotypes of elderly and young adults: a comparison of structure and evaluations.

Following Schmidt and Boland's (1986) method, college student informants sorted a trait set into 1 or more groups with reference to elderly or young adults. Analysis of these data confirmed the existence of multiple stereotypes of both age groups but showed little similarity between stereotypes of the elderly and the young. Other informants made attitude, age, and typicality judgements of persons representing either the elderly or young adult stereotypes. Results showed that attitudes varied with the stereotype activated and were similar for analogous elderly and young adult stereotypes. Results also suggested that young adults do not view negative stereotypes as more typical of the elderly than positive ones; however, they believe the negative stereotypes are more characteristic of the old-old than are the positive and see positive stereotypes as more typical of young adults than negative ones.

Adolescent↗
PubMed2001

Stereotype susceptibility in children: effects of identity activation on quantitative performance.

A growing body of research indicates that the activation of negative stereotypes can impede cognitive performance in adults, whereas positive stereotypes can facilitate cognitive performance. In two studies, we examined the effects of positive and negative stereotypes on the cognitive performance of children in three age groups: lower elementary school, upper elementary school, and middle school. Very young children in the lower elementary grades (kindergarten-grade 2) and older children in the middle school grades (grades 6-8) showed shifts in performance associated with the activation of positive and negative stereotypes; these shifts were consistent with patterns previously reported for adults. The subtle activation of negative stereotypes significantly impeded performance, whereas the subtle activation of positive stereotypes significantly facilitated performance. Markedly different effects were found for children in the upper elementary grades (grades 3-5). These results suggest that the development of stereotype susceptibility is a critical domain for understanding the connection between stereotypes and individual behavior

Adult↗
PubMed2003

Status, testosterone, and human intellectual performance: stereotype threat as status concern.

Results from two experiments suggest that stereotype-threat effects are special cases of a more general process involving the need to maintain or enhance status. We hypothesized that situations capable of confirming a performance stereotype might represent either a threat to status or an opportunity for enhancement of status, depending on the nature of the stereotype. The positive relationship between baseline testosterone and status sensitivity led us to hypothesize that high testosterone levels in males and females would amplify existing performance expectations when gender-based math-performance stereotypes were activated. In Study 1, high-testosterone females performed poorly on a math test when a negative performance stereotype was primed. In Study 2, high-testosterone males excelled on a math test when a positive performance stereotype was primed. The moderating effect of testosterone on performance suggests that a stereotype-relevant situation is capable of conferring either a loss or a gain of status on targets of the stereotype.

Adolescent↗
PubMedDate not supplied

The age dependence of stereotyped behaviours in blind infants and preschoolers.

As part of a research programme on early intervention and family care for blind infants and preschoolers, the Bielefeld Parents' Questionnaire for Blind and Sighted Infants and Preschoolers was given to 85 parents of congenitally blind children. All 85 children (from 5 to 72 months) in the sample were totally blind and had no further serious disabilities. A comparison of five age groups of blind infants and preschoolers indicated that the repertoire of stereotyped behaviour patterns depended on age. After expanding from the first to the second year of life, the range of different stereotyped behaviours decreased from the age of 3 years up to school enrollment. The amount of stereotyped behaviours showed a similar course. Among the individual stereotyped behaviours, only the frequency of eye poking and body rocking increased from the first to the second year of life and then maintained a relatively high level across the entire preschool age range. The situational and person-specific conditions under which stereotyped behaviours could typically be observed also appeared to change with the child's age. While in the first years of life, monotony and arousal situations dominated among the elicited stereotyped behaviours, the 4- to 6-year-old blind children increasingly exhibited stereotyped behaviours in situations in which they were confronted with cognitive and concentrative demands. Various possible explanations of the age dependence of stereotyped behaviour patterns in blind infants and preschoolers are discussed.

Age Factors↗
PubMed1989

The effects of stereotyped behaviour on orienting and tonic cardiac activity.

The relationship of cardiac activity to stereotyped behaviour was studied in profoundly mentally retarded persons, using both inter-group comparisons. The first intra-group comparison involved examining the relative magnitude of an orienting response to an auditory stimulus during the occurrence or nonoccurrence of stereotyped body rocking. While no differences were found between periods of rocking and non-rocking when behavioural measures of orienting were used, smaller changes in post-tone heart rate were observed during periods of stereotyped rocking. A second intra-group comparison found that stereotyped behaviour was associated with a significant increase in heart rate but no change in heart rate variability when compared to periods of no stereotyped activity. Finally, using an inter-group comparison, individuals who displayed stereotyped body rocking exhibited higher tonic heart rates and lower heart rate variability during periods of no stereotyped behaviour than was observed in matched control subjects. This result suggests that stereotyped behaviour may be correlated with reduced vagal tone.

Acoustic Stimulation↗
PubMed2006

Category and stereotype activation revisited.

In Study 1 (N= 230), we found that the participants' explicit prejudice was not related to their knowledge of cultural stereotypes of immigrants in Sweden, and that they associated the social category immigrants with the same national/ethnic categories. In Study 2 (N= 88), employing the category and stereotype words obtained in Study 1 as primes, we examined whether participants with varying degrees of explicit prejudice differed in their automatic stereotyping and implicit prejudice when primed with category or stereotypical words. In accord with our hypothesis, and contrary to previous findings, the results showed that people's explicit prejudice did not affect their automatic stereotyping and implicit prejudice, neither in the category nor stereotype priming condition. Study 3 (N= 62), employing category priming using facial photographs of Swedes and immigrants as primes, showed that participants' implicit prejudice was not moderated by their explicit prejudice. The outcome is discussed in relation to the distinction between category and stereotype priming and in terms of the associative strength between a social category and its related stereotypes.

Adolescent↗
PubMed1994

Biases in memory for and use of inconsistent beliefs in stereotyping.

Some research has suggested that level of inconsistency of information that invalidates expectancy-based stereotypes or trait labels is one of several moderating variables that determine the memorability and use of inconsistent information (e.g. Rojahn & Pettigrew, 1992). Two experiments were designed to identify variables that moderate memory for and use of counter-stereotypic social-political beliefs that were attributed to a stereotypically identified group. In Expt 1, recall was found to be inversely related to level of inconsistency. In Expt 2, location of counter-stereotypic beliefs within a list and the order of counter-stereotypic beliefs (most-to-least vs. least-to-most inconsistent) determined the form of the relationship between recall and level of inconsistency. When counter-stereotypic beliefs were presented relatively early in a list and were ordered from least-to-most inconsistent, a positive relationship obtained; otherwise, the relationship was negative. Stereotyping was less extreme when counter-stereotypic beliefs were presented early in the least-to-most inconsistent ordering. Cognitive processes that may have produced these sets of findings were discussed.

Adolescent↗
PubMed1981

Stereotypes of mental illness. A test of the labelling hypothesis.

A questionnaire to discover the existence of stereotypes of mental illness was given to 133 subjects. Three hypotheses were tested: 1. that a stereotype of mental illness exists, and is an accurate impression of the behaviour of the mentally ill. Both aspects were clearly confirmed, in that a stereotype was shown to exist which closely resembled the behaviour of psychiatric patients described in objective studies. 2. stereotypes of mental illness are sex differentiated. This was not clearly supported, and some of the differences perceived between mentally ill women and men might be attributable to 'normal' sex role differentiation. 3. the stereotype of a 'normal' woman more closely approximates that of a mentally ill woman than do the corresponding male stereotypes. Strong confirmation was found that the two female stereotypes correlate quite closely, but the male stereotypes do not. The conclusion is that the data are supportive of certain central labelling hypotheses.

Adolescent↗