Luminance affects age-related deficits in object detection: implications for computerized psychological assessments

As psychological instruments are converted for administration on computers, differences in luminance and contrast of these displays may affect performance. Specifically, high-luminance assessments may mask age-group differences that are apparent under lower luminance conditions. We examined the effects of luminance and contrast on object detection using computerized and naturalistic assessments. Younger and older adults displayed more differences in performance across differing contrast levels in conditions that were matched for luminance, despite the conditions appearing perceptually different. These findings indicate that computerized assessments should be created with luminance levels that are similar to those of the tasks they purport to simulate in order to enhance their validity.     

Recognition of complex object-centred spatial configurations in early infancy

In a series of experiments we tested 4- and 8-month-olds’ ability to represent the spatial layout of an object across changes in its orientation with respect to egocentric spatial coordinates. A fixed-trial familiarization procedure based on visual habituation behaviour shows that both age groups are able to discriminate between different object-centred spatial configurations. Furthermore, both age groups demonstrate the ability to make discriminations of object-centred spatial coordinates that require simultaneous reference to at least two spatial axes of the object. We discuss these findings in relation to theories of the early development of object recognition and spatial reference skills.     

Toward a psychoeducational curriculum for training sport-injury rehabilitation personnel

Abstract

This paper addresses significant gaps in the wining programs of sport-injury rehabilitation personnel (SIRPs) in the psychology ma. The main aim of the article is to offer for consideration a psychoeducational curriculum that is specifically designed for the training of professionals who work with injured athletes. In addition to describing the applied implications of research on the psychological aspects of sport injuries for professional practitioners. reviews of what SIRPs consider is missing-but-desirable in their professional wining. and the effectiveness of certain psychological strategies, are presented. Finally. an overview of a prototypical three-year curriculum for professional training programs is outlined.     

Community Counselling in African Contexts

This article explores community counselling as a form of professional practice for psychologists, with a particular focus on practices that are relevant in African contexts. The discussion identifies and discusses various models of practice identified in community psychology, including an ecological perspective, a public health and community mental health framework, interventions that focus on promoting a sense of community, indigenous approaches to community counselling and a critical or social action framework. Examples relating to each of these models of practice are drawn from various African settings, providing practitioners with some insights into how theory can be operationalised into practices that are relevant to African contexts. The article concludes with a discussion on community research, with a particular focus on ethical considerations relevant to a community approach in African contexts. The latter discussion emphasises the importance of working with the community as partners, and suggests the possibility of developing a Code of Ethics aimed specifically at guiding community counselling practice in African contexts.     

“Mindless” Decision Making as a Failure of Contextual Reasoning

People often make decisions without reference to vital information, even when such information is readily available. In the present research, the authors addressed the possibility that this tendency may derive from failure to have pertinent information immediately available in the decision context. Participants rated the utility of decisions in either the presence or absence of simple pertinent information. The information provided required no training and was relatively obvious (e.g., if money is spent on a given item, that money will not be available for other expenditures). Presentation of such information in the immediate context of decisions significantly improved participants' abilities to understand their negative consequences. These results indicate that the presentation of pertinent information in immediate decision contexts, even information that is already available through participants' long-term memory, can improve the understanding of decision situations and reduce “mindlessness” in decision processes.     

A Note on the Natural Basis of Action Categories

What is the basis for the categorical distinctions evident in action? For some visually-guided activities it can be shown that categories of action are specified by criterial values of optical properties. In the more general case, the criterial optical properties should be scaled relative to dimensions of the acting animal. The analysis of the prey-catching behavior of praying mantids is used to exemplify the strategy for determining naturally defined boundaries on actions.     

Measuring Postural Sway in Sitting: A New Segmental Approach

Global measures of trunk sway are traditionally used even though the trunk comprises a multiple number of segments. The authors’ aim was to measure the seated sway of typically developing children using a multisegment approach. Twenty typically developing children divided into 2 groups, older and younger than 10 years old, participated in this study. The children sat unsupported for 30 s while their posture and sway were quantified using stereophotogrammetry. The tendency in both age groups was to sit with a backward tilted pelvis and a kyphotic trunk. The sitting position was most varied in the younger group. Marker sway amplitude and velocity in sitting were age dependent, with reduced sway amplitude and velocity with increased age for all segments. Anteroposterior intersegmental angular sway was not age dependent. The difference in marker sway in the anteroposterior direction for the younger group appeared to result from an equally stable trunk supported on a less stable pelvis. Mediolateral marker sway and intersegmental angular sway showed a clearer age dependency. Trunk postural control does not appear to differ between children older and younger than 10 years old, but sagittal plane pelvic stability can explain the increased sway reported in younger children.