Detection of noisy visual targets: Models for the effects of spatial uncertainty and signal-to-noise ratio

Brigham and Women’s Hospital, Boston, Massachusetts 02115 An “extreme-detector” model for detecting spatially uncertain targets in noisy backgrounds predicts how both detection and localization abilities are degraded by increasing the number of possible target locations. Experiments 1 and 2 show that the model accurately predicts detection and localization performance in tasks with two, four, and eight locations from d’ estimates of the observer’s ability to detect the target in a known spatial location. These predictions can be linked to the physical stimuli by combining the extreme-detector model with a “psychophysical” model that specifies how stimulus measures determine the target’s detectability in a given location. Single-parameter fits of four such combined models were compared with estimates of detection and localization performance in Experiment 3, which manipulated the target’s physical signal-to-noise ratio across various conditions of an eightlocation task.     

Problem solving in hyperactive,normal, and reading-disabled boys

Diagnostic problem solving was examined in groups of hyperactive, normal, and nonhyperactive reading disabled boys matched on age and verbal IQ. On the matrix solution task employed (a version of the game of 20 Questions) hyperactives used less efficient questions and strategies than the other two groups, in spite of the task being designed to maximize the performance of the hyperactives. Readingdisabled children were not significantly worse than normal children on the task. The results were interpreted as suggesting that the attentional difficulties of hyperactives retard the development of strategies for solving complex problems. Nonhyperactive reading disabled children may be less affected in this area because of the absence of significant attentional difficulties.This article is based on a doctoral dissertation submitted to the Faculty of Graduate Studies and Research of McGill University by the first author. We are grateful to the students, teachers, and principals of the following schools in the Montreal area: Allancroft, Beacon Hill, Briarwood, Cedar Park, Greendale, Hillcrest, Lakeside Heights, Martinvale, Sunny Dale, Thomas H. Bowes, and Vivian Graham. Special thanks are due Rhonda Amsel, John MacNamara, and Chet Olsen for their help and advice.     

Children as psychologists: The later correlates of individual differences in understanding of emotions and other minds

Abstract

The sequelae of individual differences in children's understanding of emotions and of other minds were investigated in a longitudinal study of 46 children. At 40 months, differences in the children's understanding of emotions were not significantly related to their ability to explain behaviour in terms of beliefs within a false belief paradigm. Follow-up in kindergarten showed that early emotion understanding was related to children's positive perception of their peer experiences, to their understanding of mixed emotions, and their moral sensibility as kindergarteners. Early understanding of other minds was, in contrast, related to negative initial perceptions of school, and sensitivity to teacher criticism. These differences in sequelae highlight the importance of differentiating the emotional and cognitive components of social understanding in framing developmental questions.     

The non-symbolic level of psychical reality

Freud introduced the concept of psychical reality as a consequence of abandoning the theory of seduction, and although this meant a turning point in his theoretical thinking he never defined the concept concisely and systematically. Thus it is possible to delineate at least two meanings of psychical reality that run through Freud´s writings as well as the writings of contemporary analysts. On the one hand psychical reality encompasses the whole field of subjective experiences. On the other, it is understood more narrowly as a transformation of experiences in the unconscious.

Substituting the idea of different meanings ascribed to Freud´s concept this article proposes to differentiate between levels in the psyche with the main focus on the unconscious level of the dream and of phantasy and the real unconscious. Starting from the most superficial level of subjective reality the text moves to that of fantasy formation illustrated by primarily Freud´s text on `A child is being beaten´. Adding Laplanche´s translational model the article ends up at the deepest level represented by the late Lacan and his concept of the real Unconscious.

The paper concludes that the term real points to something exceeding symbolization and the imaginary—thus escaping comprehension—and yet is absolutely indispensable to the organization of unconscious processes.     

Building Capacity Among Laity: A Faith-Based Health Ministry Initiative

A systematic review of topic-specific faith-based health programs determined that health outcomes can be improved though faith-based health interventions. A university research team, in partnership with the Kansas United Methodist Church and a United Methodist philanthropy, facilitated planning and development of a statewide initiative to increase the capacity of laity-led health ministry teams. The purpose of this paper is to describe the processes utilized to design and implement an initiative to increase capacity for laity-led comprehensive health ministry among Kansas United Methodist Church congregations and to share the key elements of the initiative.     

Comparing Live and Video Observation to Assess Early Parent-child Interactions in the Home

Observation is the ‘gold standard’ for assessing parent-child behavior, however few studies have compared coding live, in real time, versus coding from videotapes in terms of their achievable levels of coder reliability within the field of parent programme research. This is important for practitioners and researchers for whom decisions might be influenced by time and financial constraints, but where outcomes may have real practical and clinical implications. Trained coders in the Dyadic Parent-Child Interaction Coding System Revised, coded 40 half-hour videotapes of 33 parent-toddler dyads interacting in the home on 29 items of dyadic behaviour. Four theorised composite variables were constructed. Videotaped data were compared to data drawn from the same interactions previously coded ‘live’ in the home. Correlations indicated significant agreement between the two modes at the item by item level (p?<?.001). Wilcoxon Rank tests revealed significant differences (p?<?.001) between the two modes. Eight items exceeded a ±30% change in median score suggesting clinically relevant differences. Although both methods achieved acceptable levels of inter-rater reliability, video coding achieved higher levels of agreement. Subtle differences exist between the two modes. Whilst neither mode proved superior it is suggested that they should not be used interchangeably.     

Genetic Counseling for Early-onset Familial Alzheimer Disease in Large Aboriginal Kindred from a Remote Community in British Columbia: Unique Challenges and Possible Solutions

A novel, pathogenic presenilin 1 (PS1) mutation has recently been identified in a large Aboriginal kindred living in dispersed communities throughout British Columbia, Canada. Disseminating genetic information and ensuring that appropriate genetic counseling services are provided to all concerned relatives have posed several unique challenges. These challenges include knowledge exchange and continuity of care in a geographically remote and culturally distinct community. To our knowledge, this is the first time a specific genetic counseling approach has been needed for early-onset familial Alzheimer disease (EOFAD) in a North American Aboriginal community.     

An ethics perspective on transcranial magnetic stimulation (TMS) and human neuromodulation

This paper concerns the ethics of human neuromodulation using transcranial magnetic stimulation (TMS). We examine the challenges of modulating the brain with TMS through the research ethics lens and in clinical medicine for treating frank pathology, primarily in psychiatric diseases. We also consider contemporary issues raised in the neuroethics literature about managing unexpected findings, and relate these to TMS and to other frontier neurotechnology that is becoming openly available in the public domain. We argue that safety and informed consent are of paramount importance for TMS, but that personal values and sociocultural factors must also be considered when examining the promise of this technology and applications that ought to be highlighted for extra precautions.