Spatial and feature-based memory representation in free-flying homing pigeons

The memory-based recognition of a goal is a capacity well demonstrated in birds, and understanding this ability often involves determining the relative importance of spatial and feature information in representing the properties of a goal. However, surprisingly little avian research has examined goal recognition in a field setting. Here, we demonstrate that homing pigeons can be successfully trained outdoors to fly to and land on a goal platform located in an array of other platforms at a distance on the order of 100 m. They can do so under conditions when the properties of the goal are stable in time as well as when the properties of the goal periodically change; the latter condition indicating that homing pigeons can rapidly adapt their memory representations to take into account changing environmental conditions. When probed for preferential use of either spatial (location) or feature-based (color) information, the pigeons demonstrated an indifferent capacity to use both independent of task demands. The homing pigeon memory systems that support goal recognition appear to be opportunistic with respect to the information exploited, using spatial and feature information equally to guide their behavior. Therefore, and despite strong natural and artificial selection for navigational ability, spatial information is no more important than feature cues in representing a goal location for homing pigeons flying outdoors.     

Developmental Trajectories of Girls’ and Boys’ Delinquency and Associated Problems

Developmental trajectories in delinquency through adolescence were studied along with family and peer relationship problems. Drawing from eight waves of data over seven years, we conducted trajectory analyses with a sample of 746 students (402 girls; 344 boys). Analyzing girls and boys together, a five-class model emerged: 60% of the adolescents rarely reported delinquency; 27.7% reported low initial levels with moderate levels of delinquency over time; 6% in the late onset group reported initially low and rising levels of delinquency; 5% in the early onset group reported moderate initial levels which increased and then decreased in later adolescence. A small group of only boys (1.3%) labeled chronic reported high initial levels of delinquency that increased over time. Group comparisons revealed problems in internalizing, parent and peer relationship problems. The findings provide direction for early identification and interventions to curtail the development of delinquency.     

Mental Health Literacy of Australian Rural Adolescents: An Analysis Using Vignettes and Short Films

The mental health literacy (MHL) of rural adolescents has rarely been investigated. This study examined the MHL of 122 rural‐based adolescents (49 males, 73 females) aged 12–18 years (M = 16, SD = 1) using written vignettes and short films to examine knowledge about depression. For the written vignettes, 68% of the rural adolescents were able to correctly identify someone with depression, which is similar to the findings for metropolitan adolescents; however, knowledge about recovery times and avenues of assistance were below that of their metropolitan peers. Participants were less likely to correctly diagnose depression when suicidal intent was not expressed and when the scenario was presented in the more naturalistic form of a film. This finding raises questions about the place of films and written vignettes in future MHL research.     

Young Children's Reactions to Mothers’ Disclosure of Maternal HIV+ Serostatus

Little is known about the impact of maternal disclosure of HIV-positive serostatus on young children. The objective of this study was to explore this topic, utilizing in-depth qualitative interviews. Qualitative interviews were conducted with 47 mothers who had disclosed to their young, well child, and with the children. The most prevalent child response was anxiety, primarily focused on the mother's health and fear of her death. A number of children also worried about other people finding out, and seemed aware of the stigma surrounding HIV. For most children anxiety decreased over time, although for a small number it sustained and became maladaptive. The majority of children appeared to adjust well to maternal disclosure. Mothers who are planning to disclose their serostatus to their young children should be encouraged to plan for appropriate psychosocial follow-up following the disclosure, with special focus on the stigma associated with HIV.     

Ethnicity and Gender Stereotypes of Emotion

In three studies we investigated gender stereotypes of emotions among four ethnic groups in the U.S., using persons from these groups as informants about their own groups. European Americans’ reports of stereotypes were compared to those of African Americans (Study 1), Hispanic Americans (Study 2), and Asian Americans (Study 3). The examination of group differences was interpreted based on variations across ethnicities in norms concerning emotional expression and gender roles. Overall, gender stereotypes of emotion were evident among all ethnic groups studied, but European Americans’ gender stereotypes were the most gender differentiated. For example, European American stereotypes held that men express more pride than women do, but African Americans’ stereotypes of pride for men and women did not differ. Similarly, whereas among European Americans, women were stereotyped to express much more love than men do, the gender difference was smaller among Hispanic Americans and Asian Americans. These different norms may pose challenges for inter-cultural interactions, and they point to the importance of considering both gender and ethnicity simultaneously in the study of emotions.     

Perseveration in Normal Aging: A Comparison of Perseveration Rates on Design Fluency and Verbal Generative Tasks

Three generative tasks (design generation, animal naming, words starting with m) from the Cognitive Linguistic Quick Test were administered to 73 healthy individuals in four age groups (18–39, 40–59, 60–74, 75–88) and scored for perseveration and productivity. Perseveration rates for design generation were significantly higher, and increased linearly as a function of age. The number of individuals who perseverated at least once on design generation also increased linearly, with highest prevalence in the oldest group. No age effects were found for perseveration on the verbal naming tasks. Perseverations across tasks were independent of one another. The design generation task may require multiple simultaneous processing skills, placing more demand on compromised executive processing in the elderly.     

The development of children's mental tracking strategies on a rotation task

In two experiments, 5- to 13-year-old children were required to mentally track the rotation of a pointer around a circular backdrop, and to indicate the pointer's imagined position on the backdrop at the sound of a signal. In Experiment 1, children imagined the pointer rotate around its end point. In Experiment 2, children imagined the pointer rotate around its midpoint, and indicated the position of one of its two ends at the time of the signal. The end to be indicated was not specified by the experimenter until the time of the signal. Thus, children were required to use an imaging strategy that could keep track of the changing positions of both ends of the pointer. In both experiments, children older than 8 years of age generated linear distance × time functions indicating mental tracking, but younger children did not. In Experiment 2, the proportions of children at each grade level using holistic or part-to-part strategies to mentally track the pointer were comparable, as were mental tracking rates. The results were discussed in relation to both recent research on children's counting, and Piagetian and information-processing views of metal imagery development.     

Construct validation of the dependency and self-criticism scales of the depressive experiences questionnaire

S. J. Blatt (Psychoanalytic Study of the Child, 1974, 29, 107–157) distinguished between two types of depressive experiences, one characterized by strong dependency needs and the other by self-criticism and guilt. This paper reports a series of validation studies of the Depressive Experiences Questionnaire (DEQ), which was developed to measure individuals' vulnerabilities to these types of experiences (S. J. Blatt, J. P. D'Afflitti, & D. M. Quinlan, Journal of Abnormal Psychology, 1976, 85, 383–389). The Dependency and Self-Criticism scales were shown to be stable in the face of both a 13-week interval and the receipt of midterm grades. Dependency was associated with conflict concerning the expression of hostility and, in males, feelings of helplessness. Self-Criticism was associated with low self-esteem and high levels of morality-conscience guilt. In a study of behavior in dyadic problem-solving tasks, Dependency in males was found to be negatively related to task leadership, and Self-Criticism in females tended to be negatively related to judged likeability. On the other hand, little support was found for the hypotheses that Dependency would be related to field dependent cognitive style and to the use of primitive defense mechanisms. The results were viewed as supporting the utility of Blatt's distinction between the two types of depression, but a number of anomalous findings indicated a need for further study of the DEQ. The question of the developmental level of the two types of depression, possible sex differences in the correlates of the scales, and the possibility of situational specificity in individuals' responses were identified as the areas most in need of study.     

Seniority in the generational transition of laboratory groups: The effects of social familiarity and task experience

The determinants of leadership seniority in laboratory groups were investigated in two experiments. In both experiments a procedure was used in which individual group members were periodically replaced throughout 7 generations. The individuals within the groups folded origami products and traded with other groups so as to earn quarters. In the first experiment the effect of social familiarity on seniority was investigated by comparing a set of standard groups with a set of rotational groups in which the group members moved from group to group between generations and thus always interacted with strangers. There was less seniority in the rotational groups. In the second experiment the effect of experience on seniority was investigated by comparing a set of standard groups with a set of experienced groups in which the new group members were recruited from the standard groups. There was less seniority in the experienced groups. It was found in both experiments, in agreement with previous research, that over generations the subjects earned increasing amounts of money and worked with increasing speed and efficiency.