Parallel computations for controlling an arm

In order to control a reaching movement of the arm and body, several different computational problems must be solved. Some parallel methods that could be implemented in networks of neuron-like processors are described. Each method solves a different part of the overall task. First, a method is described for finding the torques necessary to follow a desired trajectory. The methods is more economical and more versatile than table look-up and requires very few sequential steps. Then a way of generating an internal representation of a desired trajectory is described. This method shows the trajectory one piece at a time by applying a large set of heuristic rules to a "motion blackboard" that represents the static and dynamic parameters of the state of the body at the current point in the trajectory. The computations are simplified by expressing the positions, orientations, and motions of parts of the body in terms of a single, non-accelerating, world-based frame of reference, rather than in terms of the joint-angles or an egocentric frame based on the body itself.     

Compliance,coercion, and compassion: Moral dimensions of the return of tuberculosis

Since 1986, we have seen a rise in the occurrence of tuberculosis in the United States. Long considered defeated in this country, the disease is returning with distressing vigor. Outbreaks of MDR-TB, tuberculosis resistant to more than one medication, have been reported around the country. This article analyzes the Centers for Disease Control and Prevention's National Action Plan to Combat Multidrug-Resistant Tuberculosis, with particular focus on the moral dimensions of mandatory directly observed treatment (DOT) and involuntary quarantine. It is proposed that a moral response to the control of tuberculosis must be one which is sustainable and which can effectively curtail the spread of the disease at a minimal cost to individual rights.     

Lesioning an attractor network: investigations of acquired dyslexia

A recurrent connectionist network was trained to output semantic feature vectors when presented with letter strings. When damaged, the network exhibited characteristics that resembled several of the phenomena found in deep dyslexia and semantic-access dyslexia. Damaged networks sometimes settled to the semantic vectors for semantically similar but visually dissimilar words. With severe damage, a forced-choice decision between categories was possible even when the choice of the particular semantic vector within the category was not possible. The damaged networks typically exhibited many mixed visual and semantic errors in which the output corresponded to a word that was both visually and semantically similar. Surprisingly, damage near the output sometimes caused pure visual errors. Indeed, the characteristic error pattern of deep dyslexia occurred with damage to virtually any part of the network.     

Adaptation of CBT for Traumatized Egyptians: Examples from Culturally Adapted CBT (CA-CBT)

In this article we illustrate how CBT can be adapted to a traumatized Egyptian population with Islamic beliefs, giving examples from our adaptation of Culturally Adapted–CBT (CA-CBT) for this cultural group. We discuss a culturally sensitive assessment measure of local somatic complaints and cultural syndromes that was devised based on clinical experience with traumatized Egyptians. We also demonstrate how to normalize symptoms, create positive expectancy about the treatment, and educate about trauma. We give examples of how mindfulness can be adapted for an Egyptian Islamic population, and we describe local religious strategies, such as dhikr (religious chanting), salah (ritualistic prayer), and dua (supplication), that may be used to promote attentional shift from rumination topics and to teach attentional control. We describe how “loving kindness” can be adapted for this group. We outline how to modify culturally generated catastrophic cognitions and how to conduct interoceptive exposure and to create positive re-associations in a culturally sensitive manner. We describe how worry themes are explored and addressed based on a heuristic panic attack–PTSD model; how to teach anger management in a culturally sensitive way; and how to address sleep-related problems in this population. We suggest using cultural transitional “rituals” at the end of the treatment to give patients a sense of closure and a positive feeling of transformation. A case example is presented to illustrate cultural challenges associated with delivering CA-CBT to an Egyptian population. We introduce certain concepts such as cultural grounding and explanatory model bridging, both therapeutic techniques that increase adherence, positive expectancy, and cultural consonance.     

The Nootropic Properties of Ginseng Saponin Rb1 are Linked to Effects on Anxiety

Previous studies have shown that crude ginseng extracts enhance performance on shock-motivated tasks. Whether such performance enhancements are due to memory-enhancing (nootropic) properties of ginseng, or to other non-specific effects such as an influence on anxiety has not been determined. In the present study, we evaluated both the nootropic and anxiolytic effects of the ginseng saponin Rb1. In the first experiment, 80 five-day-old male chicks received intraperitoneal injections of 0, 0.25, 2.5 or 5.0 mg/kg Rb1. Performance on a visual discrimination task was evaluated 15 minutes, 24 and 72 hours later. Acquisition of a visual discrimination task was unaffected by drug treatment, but the number of errors was significantly reduced in the 0.25 mg/kg group during retention trials completed 24 and 72 hours after injection. Animals receiving higher dosages showed trends towards enhancement initially, but demonstrated impaired performance when tested 72 hours later. Rb1 had no effect on response rates or body weight. In the second experiment, 64 five-day-old male chicks received similar injections of Rb1 (0, 0.25, 2.5 or 5.0 mg/kg) and separation distress was evaluated 15 minutes, 24 and 72 hours later. Rb1 produced a change in separation distress that depended on the dose and environmental condition under which distress was recorded. These data suggest that Rb1 can improve memory for a visual discrimination task and that the nootropic effect may be related to changes in anxiety.     

Dizziness- and Palpitations-predominant Orthostatic Panic: Physiology,Flashbacks, and Catastrophic Cognitions

In an orthostatic challenge, Cambodian patients with orthostatic panic in the last month (OP patients) sometimes panicked during orthostatic challenge, whereas those without orthostatic panic in the last month (NOP patients) did not. Also, OP patients with primarily dizziness during orthostatic challenge panic (OP_OCP-D) had a less vigorous physiological response than two other groups: (a) OP patients with primarily palpitations during orthostatic challenge panic (OP_OCP-P) and (b) NOP patients who had no symptoms during orthostatic challenge (NOP_NOCP-NS). Among the patients experiencing orthostatic challenge–induced panic (i.e., the OP_OCP-D and OP_OCP-P patients), there were prominent orthostatic challenge–induced flashbacks and catastrophic cognitions, and the severity of orthostatic challenge–induced flashbacks and catastrophic cognitions correlated with the severity of orthostatic panic in the previous month and with the severity of orthostatic challenge–induced panic.     

A Test of Contextual Theory: The Relationship Among Relational Ethics,Marital Satisfaction,Health Problems,and Depression

Few studies have examined the theoretical underpinning of contextual theory. Using structural equation modeling, the relationship among relational ethics (recognized as the most important aspect of contextual theory), marital satisfaction, depression, and illness was examined. Data came from a national sample of 632 mid-life, married individuals. Results supported Nagy’s contextual theory. The total score of the Relational Ethics Scale was a significant predictor of marital satisfaction, and marital satisfaction was significantly associated with depression and health problems. Vertical and horizontal subscales of relational ethics also were significant predictors of depression and health problems through the mediating variable of marital satisfaction.     

How a ten-year-old girl faced her death

E. Bott Spillius. Melanie Klein Today. Vol. 1, 1988. Mainly Theory. Vol. 2, Mainly Practice. London: Routledge. £35 (Cloth). £14.99 (Paper).

Ilse Hellman. From War Babies to Grandmothers: Forty-Eight Years in Psychoanalysis. London: Karnac Books &; The Institute of Psycho-Analysis. 1990. £16 (paperback).

James and Joyce Robertson. Separation and the Very Young. London: Free Association Books. 1989. £25.00 (hardback). Edward C. Melhuish and Peter Moss (eds.). Day Care for Young Children: International Perspectives. London and New York: Tavistock/Routledge. 1990. £12.99 (paperback).

Jeremy Holmes and Richard Lindley: The Values of Psychotherapy. Oxford: Oxford University Press. 1989. (£17.50).

Caroline Case and Tessa Dalley (Editors): Working with Children in Art Therapy. Published by Tavistock/Routledge. London and New York, 1990. £14.9.     

Characteristics and Effects of the Co-parenting Alliance between Incarcerated Parents and Child Caregivers

We examined co-parenting alliance based on information provided by 57 incarcerated parents and their corresponding child caregivers who took part in the Messages Project, in which incarcerated parents video recorded greetings to children that were then mailed home. We assessed perceptions of co-parenting alliance, measured by the Parenting Alliance Measure, and levels of child contact from both parents and caregivers. We also observed expressions of positive and negative attitudes that prisoners expressed regarding the home caregiver during the video recording. Incarcerated parents reported more frequent phone contact with children and more frequent letter-writing to children than did home caregivers. Incarcerated parents likewise reported higher levels of co-parenting alliance with the home caregiver in comparison to the assessment of co-parenting alliance reported by the home caregiver. Among children observing the video recorded message, a more positive co-parenting alliance between their parent and home caregiver was associated with increased positive mood. More frequent displays of negative attitudes toward caregivers during the recordings were associated with more negative mood indicators among children. Results suggest the importance of a strong co-parenting alliance between incarcerated parents and home caregivers, but imply that incarcerated parents may have a more optimistic view of their connection home than is the case for collaborating caregivers.