Handwriting in patients with Parkinson disease: effect of L-dopa and stimulation of the sub-thalamic nucleus on motor anticipation

The present research focused on how patients with Parkinson’s disease (PD) produce handwriting sequences. PD patients who were on/off medication or deep brain stimulation treatments had to write lll and lln trigrams. We evaluated their ability to anticipate on-line the last letter in the trigram. The results revealed that in PD patients, contrary to healthy participants, the percentage of time taken by the down-stroke of the second l did not vary as a function of the spatial constraints of the following letter (l or n). In other words, the handwriting of the PD patients did not exhibit any sign of motor anticipation. However, under treatment, PD patients exhibited similar results to healthy participants despite no improvement in movement variability. Taken together these results do not seem consistent with the hypothesis that PD patients do not anticipate future movements because of their movement variability. They are more in agreement with theories that postulate that PD patients have a general deficit in the parallel processing of the components of a motor sequence.     

Examining Racial Identity and Masculinity as Correlates of Self‐Esteem and Psychological Distress in Black Men

Data presented for 124 young adult Black men indicate that self‐esteem was positively related to participants' Internalization racial identity attitudes, and negatively related to conformity to traditional masculine norms in the dominant culture in the United States. Psychological distress was positively related to Pre‐Encounter and Immersion‐Emersion racial identity attitudes (J. E. Helms, 1995) and to conformity to masculine norms. Los datos se presentan para 124 jovenes adultos Negros, que indican que el autoestima fue relacionado positivamente a la Interiorización actitudes de la identidad racial, y negativamente relacionado a la conformidad a normas masculinas tradicionales en la cultura dominante en los Estados Unidos. La angustia psicológica fue relacionada positivamente al Pre‐Encounter y el Immersion‐Emersion actitudes de la identidad racial (J. E. Helms, 1995), y a la conformidad a las normas masculinas.     

Radical views on cognition and the dynamics of scientific change

Radical views on cognition are generally defined by a cluster of features including non-representationalism and vehicle-externalism. In this paper, I concentrate on the way radical views on cognition define themselves as revolutionary theories in cognitive science. These theories often use the Kuhnian concepts of “paradigm” and “paradigm shift” for describing their ambitions and the current situation in cognitive science. I examine whether the use of Kuhn’s theory of science is appropriate here. There might be good reasons to think that cognitive science is in a situation of foundational crisis, but that does not entail that the classical paradigm (computationalism) is currently displaced to the benefit of a new paradigm. Larry Laudan’s theory of research traditions is more enlightening than Kuhn’s theory for describing the scope and ambitions of radical views on cognition, and their relations with an anti-intellectualist tradition in philosophy.

     

Let’s Open the Decision-Making Umbrella: A Framework for Conceptualizing and Assessing Features of Impaired Decision Making in Addiction

Neuropsychology Review - Decision-making impairments play a pivotal role in the emergence and maintenance of addictive disorders. However, a sound conceptualization of decision making as an...     

Trauma awareness and preparedness: Their influence on posttraumatic stress disorder development related to armed conflict experience

This study examined influences of trauma awareness and preparedness on the development of posttraumatic stress disorder (PTSD) in civilian and military personnel with exposure to the civil war. Participants were 302 people with exposure to civil war in the Democratic Republic of Congo (civilians = 68%; females = 47%; age range = 16 to 76 years old, SD = 13.58 years). Participants completed the Posttraumatic Checklist Scale, General Self-Efficacy Scale, and Traumatic Events List. The data were analysed to predict PTSD development from trauma awareness and preparedness, taking exposure to multiple traumas into account as a risk factor. Findings suggest that trauma awareness and preparedness play an important role among military personnel in moderating the risk of developing PTSD, more so than among the civilian population. Mental health professionals working with civil war survivors should seek to explore trauma awareness and preparedness as resources for minimising risk for PTSD in armed conflict situations.     

Validation of the shortened cope for use with breast cancer patients undergoing radiation therapy

To study the relationship between cancer and emotional adjustment, investigation of situation-specific coping behaviors with respect to narrowly defined Stressors has recently been promoted. The development and validation of shorter instruments, designed to facilitate completion by clinical populations, has also been recommended. The current study examined the coping skills used by French-Canadian women undergoing radiation therapy for breast cancer. A factor analysis of the 28-item shortened COPE (Carver, Scheier, & Weintraub, 1989) yielded the following eight factors: disengagement, self-distraction, active coping, using emotional support from husband/ partner, using emotional support from friends, turning to religion, humor, and substance use. The test-retest and Cronbach alpha internal consistency reliability coefficients of the French-Canadian shortened COPE were actually higher than those observed in the full-length version of the instrument. In addition, the eight factor-based scores correlated in a theoretically meaningful manner with existing measures of coping skills with illness (Coping with Health Injuries and Problems; CHIP) and mood disturbance (Profile of Mood States; POMS), thus suggesting good construct convergent and concurrent criterion validity. In particular, the disengagement COPE scale was correlated highly with anxiety, depression, and anger. While further validation is recommended, the results show promise for the shortened COPE in assessing coping in women with breast cancer, and also provide continued evidence for the notion that specific coping skills are associated with particular mood states.     

Does size rescaling require central attention?

The goal of the present experiment was to determine if object size rescaling in the shape-matching task requires central resources. Two polygons were presented side by side as the second task in a psychological refractory period paradigm. The polygons could be the same as each other or mirror images of each other and the size ratio between the two polygons was varied. In the first task, subjects were required to make a speeded response to the pitch of a tone. The polygon task followed at varying SOAs and the subjects then made a speeded same/mirror image judgement on the polygons. The size ratio effect was additive with SOA indicating that size rescaling is capacity demanding and that it requires central attention.     

Fractionating the preview benefit in search: dual-task decomposition of visual marking by timing and modality

Providing participants with a preview of half the distractors in a visual search task facilitates performance. The present study examined the effects of secondary tasks on the preview benefit in search. Participants had to attend to a visual or an auditory stream of digits that began either (a) at the onset of the preview or (b) after the preview. Secondary tasks that onset with the preview disrupted the preview benefit irrespective of their modality. Only visual secondary tasks disrupted the benefit in the delayed condition. These selective interference effects suggest that the preview benefit can be fractionated into 2 components: an initialization component that involves modality-independent resources and a maintenance component that depends on visual resources. Results are discussed in relation to theoretical accounts of the preview benefit in search.     

A multidisciplinary viewpoint on European researchon collaborative learning

Zusammenfassung. In den Jahren 1994 bis 1997 fand eine Reihe von Workshops zum Thema "Collaborative Learning" unter Beteiligung von Psychologen, Erziehungswissenschaftlern und Informatikern statt. In diesen Begegnungen zeigten sich einige Unterschiede im Verständnis des Begriffes "Collaborative Learning" zwischen Psychologie und Verteilter Künstlicher Intelligenz. Der wesentliche Unterschied betrifft die Mechanismen mittels derer kooperierende Agenten Mißverständnisse erkennen und ausräumen, um somit zu einem gemeinsamen Verständnis der Aufgabe und ihrer Lösung zu gelangen. Diese Mechanismen könnten ein vorrangiger Forschungsgegenstand werden, wenn es darum geht, die Unterschiede zwischen den Disziplinen zu überbrücken. Summary. During the years 1994 to 1997, 20 European scholars from psychology, educational science and computer science participated in a series of workshops on collaborative learning. This experience revealed various differences in the way collaborative learning is understood in psychology and in distributed artificial intelligence. The main difference concerns the mechanisms by which agents detect and repair misunderstandings in order to progressively build a shared understanding of the task at hand and its solution. These mechanisms could become a priority item on the research agenda that bridges the disciplines.