Sex differences in mental rotation strategy

When humans decide whether two visual stimuli are identical or mirror images of each other and one of the stimuli is rotated with respect to the other, the time discrimination takes usually increases as a rectilinear function of the orientation disparity. On the average, males perform this mental rotation at a faster angular speed than females. This experiment required the rotation of both mirror-image-different and non-mirror-different stimuli. The polygonal stimuli were presented in either spatially unfiltered, high-pass or low-pass filtered versions. All stimulus conditions produced mental rotation-type effects but with graded curvilinear trends. Women rotated faster than men under all conditions, an infrequent outcome in mental rotation studies. Overall, women yielded more convexly curvilinear response functions than men. For both sexes the curvilinearity was more pronounced under the non-mirror-different, low-pass stimulus condition than under the mirror different, high-pass stimulus condition. The results are considered as supporting the occurrence of two different mental rotation strategies and as suggesting that the women were predisposed to use efficiently an analytic feature rotation strategy, while the men were predisposed to employ efficiently a holistic pattern rotation strategy. It is argued that the overall design of this experiment promoted the application of an analytic strategy and thus conferred an advantage to the female participants.     

Motor and functional skills of children with developmental coordination disorder: a pilot investigation of measurement issues

This paper reports on the motor and functional outcomes of 20 children with developmental coordination disorder (DCD) aged 4-8 years consecutively referred to a pediatric physiotherapy service. Children with a Movement ABC (M-ABC) score less than the 15th percentile, and with no concurrent medical, sensory, physical, intellectual or neurological impairments, were recruited. The Motor Assessment Outcomes Model (MAOM) [Coster and Haley, Infants and Young Children 4 (1992) 11] provided the theoretical base for measurement selection, and preliminary findings at the activities and participation levels of the model are reported in this article. Children with DCD performed at the lower end of the normal range on the Peabody Developmental Motor Scales (fine motor total score) (M=85.65, SD=12.23). Performance on the Visual Motor Integration Test (VMI) standard scores was within the average range (M=96.15, SD=10.69). Videotaped observations of the children's writing and cutting indicated that 29% were left-handed and that a large proportion of all children (31%) utilized unusual pencil grasp patterns and immature prehension of scissors. Measurement at the participation level involved use of the Pictorial Scale of Perceived Competence and Social Acceptance (PCSA) and Pediatric Evaluation of Disability Inventory (PEDI). Overall, these young children rated themselves towards the more competent and accepted end of the PCSA over the dimensions of physical and cognitive competence and peer and maternal acceptance. The PEDI revealed generally average performance on social (M=49.98, SD=16.62) and mobility function (M=54.71, SD=3.99), however, self-care function was below the average range for age (M=38.01, SD=12.19). The utility of the MAOM as a framework for comprehensive measurement of functional and motor outcomes of DCD in young children is discussed.     

Language versus logic: Responses to misleading classificatory questions

In this study we examined responses to apparent forced-choice questions in which two choices were presented as options and both were correct. The responses suggested by these questions were in conflict with responses based on simple classificatory logic. The results showed that adults, as well as children, were easily misled by the implication of the questions and there was no consistent evidence for increases in the number of logical responses as a function of age. However, when children and adults were initially given set-breaking items designed to sensitize them to the misleading nature of questions, they answered the set-breaking items as well as subsequent test items correctly. The results are consistent with pragmatic theories of language that stress the role of context and intentionality as major determinants of meaning.     

A computational learning model for metrical phonology

One of the major challenges to linguistic theory is the solution of what has been termed the "projection problem". Simply put, linguistics must account for the fact that starting from a data base that is both unsystematic and relatively small, a human child is capable of constructing a grammar that mirrors, for all intents and purposes, the adult system. In this article we shall address ourselves to the question of the learnability of a postulated subsystem of phonological structure: the stress system. We shall describe a computer program which is designed to acquire this subpart of linguistic structure. Our approach follows the "principles and parameters" model of Chomsky (1981a, b). This model is particularly interesting from both a computational point of view and with respect to the development of learning theories. We encode the relevant aspects of universal grammar (UG)--those aspects of linguistic structure that are presumed innate and thus present in every linguistic system. The learning process consists of fixing a number of parameters which have been shown to underlie stress systems and which should, in principle, lead the learner to the postulation of the system from which the primary linguistic data (i.e., the input to the learner) is drawn. We go on to explore certain formal and substantive properties of this learning system. Questions such as cross-parameter dependencies, determinism, subsets, and incremental versus all-at-once learning are raised and discussed in the article. The issues raised by this study provide another perspective on the formal structure of stress systems and the learnability of parameter systems in general.     

Struggles over access to the Muslim public sphere: Multiple publics and discourses on agency,belonging and citizenship (Introduction to the Themed Section)

This introductory essay provides the context for the articles in this Themed Section. Despite the diversity in locations, historical backgrounds and contemporary processes of change, all contributors to this Themed Section focus on the struggle of Muslim groups over access to an emergent Muslim public sphere. They highlight the contestations of and shifts in the notions of agency, belonging, and citizenship in nation-states with Muslim communities within its borders. The introduction consists of two parts. The first part reviews the notion of the public sphere as conceptualized by Habermas and critiqued by scholars of a diversity of backgrounds. In relation to the concept of the Muslim public sphere, three aspects of critique are given closer consideration in this first part: the value of thinking in terms of multiple publics, the loss of legitimacy of traditional religious authorities, and the importance of agency and identity that allow individuals to engage in a diversity of publics. The second part introduces the various contributions in the Themed Section.     

Accounting for Racism Against Maori in Aotearoa/New Zealand: A Discourse Analytic Study of the Views of Maori Adults

Previous discursive studies on the construction, reproduction and justification of racism have focussed on the accounts of perpetrators to the exclusion of the targets of racist talk. The current study redresses this imbalance by exploring the talk of targets of racism in Aotearoa/ New Zealand. Interviews were conducted with 24 participants, 19 Māori and five Pākehā partners. Our social constructionist discourse analysis identifies four primary discourses that participants drew on to account for racism, two of which resonated strongly with the literature and two which spotlighted new areas of interest. A discourse of ignorance functioned to allow participants to account for racism by highlighting Pākehā ignorance of Māori people and culture, and of racism itself. The second discourse implicated the media for emphasising negative Māori news, avoiding positive Māori achievements and promoting negative stereotypes. A third discourse constructed Pākehā as possessing an innate sense of superiority which contributed to racism, and fourthly, institutionalised racism was used by participants to construct a colonial society which continued to marginalise Māori. Finally we consider the implications of these findings with respect to existing literature, some implications around the intersectionality and relationship between these discourses, and the importance of potential gains in understanding made possible through the study of targets' perspectives. Copyright © 2015 John Wiley & Sons, Ltd.     

Robots in casinos: Distributed control and the problem of efficient action selection

In this paper we characterise a tension between two views about how an agent could achieve efficient action selection. On one hand, it is common in some of the cognitive and behavioural sciences to maintain that efficient action selection requires that the value of all actions or options available to an agent are represented on a unidimensional scale of values, in other words that action selection make use of a “common currency”. On the other hand, early work in situated, embodied robotics and distributed control associated with Rodney Brooks maintained that “intelligence” could be achieved without the instantiation of any representations at all, and without centralised control systems. This line of thinking has exerted significant influence in situated and enactivist approaches to human cognition. If what situated roboticists count as “intelligence” includes capacity for efficient action selection, then their claim that intelligence can be achieved without representations is in tension with the views of those who argue that efficient action selection requires that a common currency be represented. We argue here that the apparent tension is genuine, develop an analysis of the tension itself, and offer a preliminary overview of the considerations relevant to navigating it.     

DNA markers associated with general and specific cognitive abilities

Multivariate quantitative genetic research suggests a hierarchical model of cognitive abilities where genetic effects are largely general, cutting across most cognitive abilities. Some genetic effects, however, are specific to certain cognitive abilities. These results lead to a hypothesis for molecular genetic research: Although most genes associated with one cognitive ability will be related to other cognitive abilities, some genes will be specific to a particular cognitive ability. The current research explored this hypothesis in an analysis of data in specific cognitive abilities from 86 children from 6 to 12 years of age from a larger allelic association study of general cognitive ability. Eight DNA markers were entered simultaneously in separate multiple regression analyses predicting each of four specific cognitive ability factors (Verbal, Spatial, Perceptual Speed, Memory), as well as WISC-R subtest scores. Four marjers (CTGB33, EST00083, HLA, and SOD2) showed similar effects across the cognitive ability scales, suggesting that they are related to general cognitive ability (g). These associations became negligible when the effects of ‘g’ (WISC-R IQ) were removed. Three markers (ADH5, DM, and NGFB) continued to be significantly associated with specific cognitive ability scales after the effects of ‘g’ were removed. Although preliminary, these molecular genetic results support the hierarchical model predicted by quantitative genetic research.