Strategies for spatial organization in adults and children

People have a tendency to organize space by extracting meaningful shapes from the configuration of elements. However, research on spatial correspondence in children suggests that when configural processing is difficult, individuation of elements may be critical. To begin to address the distinction between the use of configurations and individuation, and changes associated with age, we relied upon perceptual grouping and manipulated the colour of the displays—promoting either extraction of configural information (monochromatic) or individuation of elements (multicoloured). In a layout reproduction task (Experiments 1 and 2), children showed a robust advantage for multicoloured arrays, whereas adults showed an attenuated advantage for monochromatic displays. Visual discrimination in adults (Experiment 3) revealed that the influence of the display type occurs at the level of perception. Taken together, these results suggest that there are (at least) two routes to establishing spatial correspondence in arrays of elements, with differential dependence over development.     

Size and orientation cue figure-ground segregation in infants

ABSTRACT

Adult perceivers segregate figure from ground based on image cues such as small size and main axis orientation. The current study examined whether infants can use such cues to perceive figure-ground segregation. Three- to 7-month-olds were familiarized with a pie-shaped stimulus in which some pieces formed a?+?and other pieces formed an x. The infants were then presented with a novelty preference test pairing the?+?and x. The bases for the pieces forming the?+?or x were size and orientation (Experiment 1), size (Experiment 2), and orientation (Experiment 3). In each experiment, infants responded as if they recognized as familiar the shape specified by small size, main axis orientation, or their combination. Control conditions showed that infant performance could not be attributed to spontaneous preference. The findings suggest that infants can achieve figure-ground segregation based on some of the same cues used by adults.     

Infant perception of static two-dimensional transparency information

The present habituation – dishabituation study focused on infants' perception of static two-dimensional transparency displays. Infants 4 and 8 months of age were habituated to a transparency display. In this stimulus, each corner of a semi-transparent square surface covered a quadrant of a circle. During the posthabituation period, the infants were presented with the semi-transparent square overlay from the habituation display and a (non-transparent) square area cut out of the habituation stimulus. The 8-month-olds looked significantly longer at the non-transparent surface, meaning that they apparently recognized the other test pattern as the semi-transparent filter they had also seen during the habituation trials, and that they regarded the non-transparent test target as being novel. In contrast, the younger participants did not exhibit a novelty preference during the posthabituation trials. Control conditions tested the impact of spontaneous stimulus preferences on the results. The findings are discussed within the framework of infant pictorial depth perception. They provide further evidence for the hypothesis that infants' sensitivity to pictorial depth cues emerges between 4 – 5 and 7 – 8 months of life.     

Good Athlete – Bad Athlete? on the ‘Role-Model Argument’ for Banning Performance-Enhancing Drugs

The paper critically discusses a role-model argument (RMA) in favour of banning performance-enhancing drugs in sport. The argument concludes that athletes should be banned from using performance-enhancing drugs because if they are allowed to use such drugs they will encourage, or cause, youngsters who look up to them to use drugs in a way that would be harmful. In Section 2 the structure of the argument and some versions of it are presented. In Section 3 a critical discussion of RMA is presented. It is argued that we should be reluctant to accept the argument as it stands for at least three reasons: (i) it rests on an unsupported empirical claim; (ii) it also makes a false empirical claim; and (iii) the normative premise of the argument is too demanding morally. Further objections to the RMA are also discussed, but argued to be beside the point     

Agonistic and sociable behaviors in the mound‐building mice,Mus spicilegus: A comparative study with Mus musculus domesticus

Present social organization and mating systems result from selective pressures and ecological conditions but also from proximate interactions between individuals. Many studies report on a polygynous mating system with a social group territoriality in commensal populations of Mus musculus domesticus. However, little is known about the social organization of other Mus species living in outdoor conditions, such as the mound‐building mouse Mus spicilegus. Comparative studies between M. m. domesticus and M. spicilegus have already shown behavioral differences in female sexual preferences and paternal care. To study agonistic and sociable interactions and gain insight into the social organization and the mating system of M. spicilegus, the present study compared intraspecific dyadic encounters between unfamiliar adults in these two species. Results demonstrated less tolerance between females and between the sexes in M. spicilegus than in M. m. domesticus unfamiliar mice. The consequences of those differences between M. spicilegus and M. m. domesticus on social organization and mating system are discussed. Aggr. Behav. 28:75–84, 2002. © 2002 Wiley‐Liss, Inc.     

Review

Book reviewed in this article:
David Ray Griffin, Religion and Scientific Naturalism: Overcoming the Conflicts     

Justifications for bullying among Japanese schoolchildren

The present research investigated the justifications for bullying as a function of the various roles that children assume in bullying. Contrary to expectations, most children judged bullying to be right or at least permitted regardless of their role in the episode. However, children with different types of involvement in bullying showed different justification strategies. In particular, bullies were more likely to blame the victims than were children assuming other roles. Gender differences were found in the justifications provided. Boys were more likely to blame the victims, whereas girls were more likely to engage in denial of injury. These results support the notion that justifications for bullying function to sustain bullying.     

Perceived product instrumentality: the process of scale purification and validation

Perceived product instrumentality (PPI) is a new construct that is proposed as a key process component of a general model of family purchasing behaviour. PPI reflects the degree to which consumers, apprehended as actors of social roles, deem a product to be helpful, facilitative of role performance, compatible with role identity and congruent with the self‐concept. The objective of this paper is threefold: (1) assess the PPI unidimensionality and reliability; (2) purify the PPI scale, and (3) assess its validity. First, a pilot survey was administered to a convenience sample of men and women, who filled in four identical lists of 33 items tapping their attitudes towards durables, and exploratory factor analysis was conducted on each set to explore the overall pattern of the items relationships. Five try‐out pools of different sizes (33, 28, 15, 13 and 9 items) were involved in the analysis. The 15‐item scale was retained. Secondly, a large‐scale survey was administered to 500 couples as part of an extensive research involving comprehensive model testing. Exploratory factor analysis was conducted on the whole sample for reliability and unidimensionality assessment. At times, the analysis is done on men's and women's sub‐samples separately in order to account for eventual differences among both populations. Thirdly, confirmatory factor was conducted, splitting the sample into two random halves: the generation sample and the validation sample. The first half served for the PPI scales purification. In this case, PPI was posited as the latent variable and the scale items were posited as the manifest ones. The second served to validate the PPI theory in a system's framework: PPI was posited as a latent dependent variable while other role orientations variables were posited as latent independent variables. Copyright © 2002 Henry Stewart Publications.     

Executive Heads and the Role of Intergovernmental Organizations: Expansionist Leadership in the United Nations and the European Union

Despite considerable advances in methods to examine leaders' personal characteristics using at–a–distance assessment, few studies have applied such techniques outside of the national level. This study reveals that such approaches can provide analytical leverage for examining executive heads of intergovernmental organizations (IGOs). The personal characteristics of six United Nations Secretaries–General and four European Union Commission Presidents were measured via content analysis of their responses to questions. Separately, their behavior in office was measured via historical accounts and analyses. In general, executive heads with higher expansionist leadership style scores displayed a greater willingness to try to enhance the status of their organizations.     

Women's Sexual Aggression Against Men: Prevalence and Predictors

In this study, we investigated the prevalence of women's sexual aggression against men and examined predictors of sexual aggression in a sample of 248 women. Respondents reported their use of aggressive strategies (physical force, exploitation of a man's incapacitated state, and verbal pressure) to make a man engage in sexual touch, sexual intercourse, or oral sex against his will. Childhood abuse, gender role orientation, ambiguous communication of sexual intentions, level of sexual activity, and peer pressure were included as predictors of sexual aggression. Almost 1 in 10 respondents (9.3%) reported having used aggressive strategies to coerce a man into sexual activities. Exploitation of the man's incapacitated state was used most frequently (5.6%), followed by verbal pressure (3.2%) and physical force (2%). An additional 5.4% reported attempted acts of sexual aggression. Sexual abuse in childhood, ambiguous communication of sexual intentions, high levels of sexual activity, and peer pressure toward sexual activity were linked to an increased likelihood of sexual aggression. The findings are discussed in relation to the literature on men's sexual aggression.