Resolving discrepant results of the Wheatstone Experiment

Summary Soon after Wheatstone published his results obtained with the twelve earliest stereograms. Brewster disputed the result obtained with one of them. This stereogram consisted of a thick vertical line presented to one eye and a thin vertical and thick inclined line to the other. Wheatstone reported seeing depth with this figure but Brewster did not. We conducted three experiments to explore the possible reason for the disagreement. Experiment 1 indicated that the stereogram produces a variety of perceptions including the depth as reported by Wheatstone and the rivalry as reported by Brewster. Experiment 2 showed that Brewster's procedure of keeping the eyes fixed while viewing the stereogram reduces the proportion of subjects reporting depth. In Experiment 3, the top half and the bottom half of the stereogram were presented in different trials. The top of the stereogram that contains no conflicting cues produced reliable depth, but the bottom that does, did not. It is concluded that the difference in the procedures they used and the nature of the stimulus were responsible for the conflicting results.     

The representation of nonuniform motion: induced movement

Induced motion occurs when there is a misallocation of nonuniform motion. Theories of induced motion are reviewed with respect to the model for uniform motion recently proposed by Swanston, Wade, and Day. Theories based on single processes operating at one of the retinocentric, orbitocentric, egocentric, or geocentric levels are not able to account for all aspects of the phenomenon. It is therefore suggested that induced motion is a consequence of combining two different types of motion signals: one provides information by registering the motion with respect to the retina, orbit, and egocentre; the other provides information only on the relational motions between the pattern elements. Simple rules are given for defining a frame of reference for the relational motion process, which can result in a reallocation of the motion signals. It is proposed that the two signals in combination are weighted differentially, with the greater influence coming from the relational signals. Procedures for determining the weighting factors are described, and predictions from the model are examined.     

Observer bias in scoring boys' and girls' aggression

In order to examine the possibility that the attribution of more aggression to boys may be in part a function of observer bias, 40 adults were asked in Study 1 to record the degree of aggression in a series of line drawings that showed children interacting. It was found that a significant subset of both males and females recorded more aggression for boys than for girls when they scanned scenes that showed numerous children interacting. When they rated a series of drawings of two children interacting, males rated boys as significantly more aggressive than girls. Study 2 examined 48 adults' responses under one of three instruction conditions. The findings of Study 1 were replicated. Additionally, it was found that some forms of instruction eliminate sex-typed biases while others yield significant biases among both male and female untrained observers. These results are interpreted in light of the literature on schematic processing. Implications pertaining to the socialization of aggression and to research on sex differences in aggression are discussed.     

Safety locus of control as a predictor of industrial accidents and injuries

This article describes the underlying theory, development, and initial validation of the Safety Locus of Control Scale. This paper-and-pencil inventory assesses levels of safety consciousness among employees. Initial research suggests that the inventory is a reliable predictor of employees' accidents, injuries, and driving safety. Potential uses for the inventory are discussed, and future research is suggested.This article is from a paper presented at the Annual Conference of Human Resource Management and Organizational Behavior, Boston, Massachusetts, November 18–20, 1985.     

Infants’ identification of three-dimensional form from transformations of linear perspective

The ability of infants to perceive three-dimensional structure from transformations of linear perspective was investigated in two studies. Infants were habituated to the pattern of linear perspective transformations corresponding to a particular three-dimensional object, and their relative preference for that object as compared with a different three-dimensional object was assessed both before and after habituation. The habituation displays showed the distorting shadow cast by a rotating object and therefore provided only transformations of linear perspective as information specifying three-dimensional form. The pre- and posttest displays involved the actual three-dimensional objects and provided binocular, shading, and texture information specifying three-dimensional form, but did not provide informative transformations of linear perspective. In Study 1, 6-month-olds showed changes in preference from pre- to posttest that were related to the identity of the object whose shadow they had seen during habituation; 4-month-olds, however, did not show preference changes related to the habituation object. In Study 2, rhythm information that may have served as a basis for responding in Study 1 was eliminated from the test displays. Six-month-olds again showed changes in preference that were dependent on their habituation experience. It is concluded that, by 6 months of age, infants are able to perceive object structure from the isolated cue of transformations of linear perspective. The findings are discussed with reference to infants’ three-dimensional form perception based on other cues and also with reference to the emergence of certain spatially related moter activities.     

Intensive specialised multi-family therapy for multi-stressed families: Therapeutic alliance as predictor for effectiveness

The effectiveness of intense specialised multi-family therapy (ISMFT) for 111 multi-stressed families, and the therapeutic alliance as a possible predictor of outcome, were examined. A repeated measures design was used, where changes in all ISMFT phases (preparation, multi-family therapy and follow-up) were assessed and compared for both mothers and fathers. Evidence was found for improved family functioning after the therapy period, which was maintained at 3 months follow-up, although the multi-stressed families still functioned in the problematic range. The therapy did however not decrease parenting stress, or did so only temporarily. Observations of the therapeutic alliance with the System for Observing Family Therapy Alliances (SOFTA) scales indicated that high therapist engagement was related to positive therapy outcomes, both at the start of therapy and later. High family engagement also predicted therapy effectiveness, but only at the start of therapy. The present study shows that solution-focused multi-family therapy at least seems to provide the first step in alleviating problems in multi-stressed families.     

Conceptualising,designing and drafting a monthly multi-family therapy programme and manual for adolescents with anorexia nervosa

The written transmission of therapists' expertise in manuals is an important issue which is highlighted in the literature. Manuals are essential for research, training and therapeutic guidance. However, the conceptualisation, design and drafting of therapy manuals have received little attention. Our team conceptualised and designed a 10-monthly session multi-family therapy programme for adolescents suffering from anorexia nervosa. This paper presents the methodology used to evolve from training and theoretical models to designing a programme and drafting the accompanying manual. We then describe how our team reached a consensus regarding the role to be attributed to food-related symptoms in the programme. These arduous tasks were rewarded by fruitful discussions among team members, which led to a shared theory of treatment. The methodology presented here is drawn from both the experience of specialised teams and from that of families in providing care to adolescents with anorexia nervosa.     

Critical reflection and critical reflexivity as core processes for critical WOP: Precarious employment as an example

This work suggests that researchers in work and organizational psychology (WOP) and WOP as a discipline would benefit from a critical perspective on their own research and practice. We highlight the value of critical reflection and critical reflexivity on contexts of research and practice in order to increase the practical impact of WOP for everyone. First, we outline how WOP currently fails to address pressing global issues, such as precarious employment, by focusing on work-related phenomena in affluent societies and neglecting issues relevant to the majority of the world's working population. Second, we present a heuristic framework of four fundamental contextual components that are important to consider when engaging in a continuous process of critical reflection and critical reflexivity: history; economy and politics; society and culture; and personal background. Third, we illustrate why these contexts are important for WOP with the example of precarious employment. Considering context more explicitly is important for future WOP research because context not only co-determines the experiences of the working people under investigation but also the subjectivity of researchers themselves. We hope to encourage WOP researchers to engage in critical reflection and critical reflexivity to promote a more critical WOP.     

Lifespan normative data (18–89 years) for Raven's Advanced Progressive Matrices Set I

Raven's Advanced Progressive Matrices (APM) Set I is a validated and brief test of fluid intelligence, ideal for use in busy clinical settings. However, there is a dearth of normative data allowing an accurate interpretation of APM scores. To address this, we present normative data from across the adult lifespan (18–89 years) for the APM Set I. Data are presented in five age cohorts (total N = 352), including two older adult cohorts (65–79 years and 80–89 years), which allows age-standardized assessment. We also present data from a validated measure of premorbid intellectual ability, which was absent from previous standardizations of longer forms of the APM. In line with previous findings, a striking age-related decline was noted, beginning relatively early in adulthood and most marked amongst lower-scoring individuals. Older adults did not demonstrate difficulty with specific test items or make an increased proportion of specific errors. Sex was not a significant predictor of performance. The data set is of particular use in the neuropsychological assessment of older adults, given the known susceptibility of fluid intelligence to both the effects of normal ageing and acquired brain injury in older age. The results are discussed in light of theories of neurological ageing.