Dynamic object individuation in rhesus macaques: a study of the tunnel effect

A manual-search experiment with rhesus monkeys (Macaca mulatta) explored dynamic object individuation in the tunnel effect: Subjects watched as a lemon rolled down a ramp and came to rest behind a tunnel (Occluder 1) and then as a kiwifruit emerged and became occluded at the end of its path behind a screen (Occluder 2). When the kiwifruit emerged at about the time that the lemon should have (had it continued its motion), subjects searched for food only behind Occluder 2-apparently perceiving the lemon to have transformed into a kiwifruit on the basis of spatiotemporally continuous motion. In contrast, when a brief pause interrupted the occlusion of the lemon and the emergence of the kiwifruit, monkeys searched for food behind both occluders. With further control conditions, this experiment demonstrates a spatiotemporal bias-similar to a bias found in adult visual perception-in the computation of object persistence in the context of a dynamic correspondence problem.     

How prosimian primates represent tools: experiments with two lemur species (Eulemur fulvus and Lemur catta)

The authors examined how 2 lemur species (Eulemur fulvus and Lemur catta) reason about tools. Experiment 1 allowed subjects to use 1 of 2 canes to retrieve an inaccessible food reward. Lemurs learned to solve this problem as quickly as other primates. Experiment 2 then presented subjects with novel tools differing from the originals along one featural dimension. Subjects attended more to tools' sizes than to their colors and made no distinction between tools' shapes and textures. Experiments 3 and 4 presented problems in which some of the tools' orientations had to be modified relative to the food. Subjects performed well on these problems, sometimes modifying the position of the tool. These results are discussed in light of the performance of other primates on this task.     

Role of Stressful Life Events in Homelessness: An Intragroup Analysis

The present paper describes the results of an analysis of individual differences—using multidimensional strategies—in stressful life event data collected from a representative sample of homeless people (N = 289) in Madrid, Spain, which revealed the existence of three subgroups within the sample. Each subgroup can be defined by the following differentiating characteristics: The first cluster (n = 124) was characterized by economic problems; the second (n = 80) by health problems, alcohol abuse, and death of one or both parents; and the third cluster (n = 50) by an accumulation of stressful life in childhood events and alcohol abuse. In order to define the subgroups, the article also examines the differences found in other variables such as total duration of homelessness, mental and physical health status, and social support availability, among others. The existence of such subgroups within the homeless population emphasizes the importance of designing different interventions for each of these groups, adapted to their diverse needs.     

Improving attitudes towards minority groups by thinking about the thoughts and meta-cognitions of their members

Research on persuasion has shown that for attitudes to change people need to take into consideration not only the thoughts message recipients generate in response to proposals but also how people think about their own thoughts (metacognition). In the present research, we introduce a new perspective for improving outgroup attitudes focused on the distinction between cognition and metacognition but this time applied to the perceptions of others’ minds. Specifically, we examined to what extent thinking about the mental processes of outgroup members influences attitudes towards those outgroups. We compared the impact of thinking about how others think (perceived primary cognition) with how others think about their own thoughts (perceived secondary cognition or metacognition). In the primary cognition treatment, participants answered questions about the thinking processes of outgroup members. In the secondary cognition treatment, participants answered questions that required them to consider how outgroup members think about their own thoughts (i.e., metacognition). Compared to controls, these treatments were capable of improving attitudes of Spanish citizens towards Syrian refugees, South American immigrants, and Roma people. A third study used a minimal group paradigm in which a fictitious outgroup was described as having primary (vs. secondary) cognition. A final study also tested the implications of assuming that groups have one type of cognition or another. The effects of the two treatments varied depending on the type of outgroup.     

How monkeys see the eyes: cotton-top tamarins’ reaction to changes in visual attention and action

Among social species, the capacity to detect where another individual is looking is adaptive because gaze direction often predicts what an individual is attending to, and thus what its future actions are likely to be. We used an expectancy violation procedure to determine whether cotton-top tamarins (Saguinus oedipus oedipus) use the direction of another individual’s gaze to predict future actions. Subjects were familiarized with a sequence in which a human actor turned her attention toward one of two objects sitting on a table and then reached for that object. Following familiarization, subjects saw two test events. In one test event, the actor gazed at the new object and then reached for that object. From a human perspective, this event is considered consistent with the causal relationship between visual attention and subsequent action, that is, grabbing the object attended to. In the second test event, the actor gazed at the old object, but reached for the new object. This event is considered a violation of expectation. When the actor oriented with both her head-and-eyes, subjects looked significantly longer at the second test event in which the actor reached for the object to which she had not previously oriented. However, there was no difference in looking time between test events when the actor used only her eyes to orient. These findings suggest that tamarins are able to use some combination of head orientation and gaze direction, but not gaze direction alone, to predict the actions of a human agent. Received: 17 February 1999 / Accepted after revision: 9 May 1999     

The Effects of Direct Questions on Preschool Children's Responses to Indirect Requests

Indirect instructional approaches, such as responsive interaction, are common in inclusive early childhood settings. Unfortunately, young children with disabilities do not always have the skills to take advantage of these learning opportunities. Teaching children with disabilities to be more responsive to developmentally appropriate indirect instructional strategies may help them take advantage of and benefit from available learning opportunities in inclusive settings. The purpose of this research was to examine the extent to which presenting a series of direct questions increased children's attempts to respond and correct responses to indirect requests. Increased attempts to respond and correct responses to indirect requests were evident for all participants with whom the intervention was implemented. Three of the participants continued to attempt to respond and responded correctly to indirect requests when intervention procedures were removed. The contributions of these findings to literature on language instruction with young children, implications of the findings for practitioners, methodological limitations, and suggestions for future research are discussed.     

INCREASING VERBAL INTERACTION AMONG ELDERLY SOCIALLY ISOLATED MENTALLY RETARDED ADULTS: A GROUP LANGUAGE TRAINING PROCEDURE

The present study examined the effectiveness of a group language training procedure for directly increasing and generalizing the rate of verbal interaction among four elderly, socially isolated, moderately mentally retarded men. A withdrawal of treatment design was used to examine the effect of the procedure that used verbal prompts, behavioral rehearsal, and contingent social praise. Changes in behavior were examined in two generalization settings, one similiar to the training environment (Generalization I) and the other arranged as part of the subjects' daily routine (Generalization II). Baseline data indicated no verbal interaction among the subjects. During treatment the training procedure increased the rate of subjects' verbal interactions not only in the training situation, but also in the two generalization settings. An analysis of the data obtained during the Generalization II situation indicated that subjects' verbal interaction increased not only among themselves, but with nonsubject peers present in this setting. Follow-up data showed that increases in rates of verbal interaction were maintained four months after the cessation of training. The implications of the results for program generalization and work with the language deficient individual is discussed.     

Career Counseling and Vocational Psychology in Portugal: A Political Perspective

In this article, we present an overview of the political context of vocational psychology and career counseling in Portugal. The essence of our position is that career counseling needs to encompass all the major tasks of personal and social development, beyond the traditional focus on primarily vocational/occupational goals. Given the importance of social and political factors that are apparent in an analysis of the Portuguese climate within career development, we propose that vocational psychology must go beyond a conceptualization of vocational behavior and intervention based on a person–environment fit model and must try to enhance strategies for the development of persons in a broader sense. We further propose that we need to provide career counseling not only at critical decision points, but throughout the life-span, and should not focus merely on occupational details, but on all matters of the development of the person as a whole. Finally, we suggest a perspective on career counseling and vocational psychology that is more responsive to our cultural and historical context and which is sensitive to the reality of a new political era in Portugal.