Calculation of signal detection theory measures

Signal detection theory (SDT) may be applied to any area of psychology in which two different types of stimuli must be discriminated. We describe several of these areas and the advantages that can be realized through the application of SDT. Three of the most popular tasks used to study discriminability are then discussed, together with the measures that SDT prescribes for quantifying performance in these tasks. Mathematical formulae for the measures are presented, as are methods for calculating the measures with lookup tables, computer software specifically developed for SDT applications, and general purpose computer software (including spreadsheets and statistical analysis software).     

Lookup tables for linear trajectories through color space

Many applications require changing the color of a visual stimulus, so that a linear trajectory through color space is traversed. The present paper outlines two methods for generating such trajectories on computer-controlled video systems. FORTRAN implementations of each method are provided, along with measures of interest for studies of color vision.     

Perfectionism,social problem-solving ability,and psychological distress

The present research examined the relation between dimensions of perfectionism and self-appraised problem-solving behaviors and attitudes. Specifically, in two separate studies, we tested the hypothesis that socially prescribed perfectionism (i.e., the perception that others demand perfection from the self) is associated with poorer social problem-solving ability. In addition, measures of psychological adjustment were included in Study 2 so that we could (1) examine whether socially prescribed perfectionism and poorer problem-solving ability were still associated after removing variance associated with psychological distress; and (2) compare depression and anxiety in terms of their respective associations with social problem-solving ability. Correlational analyses of the data from both studies confirmed that socially prescribed perfectionism is associated with more negative self-perceptions of problem-solving orientation, and that the link between socially prescribed perfectionism and negative perceptions of problem-solving orientation remains present after removing variance due to levels of negative affectivity. Both depression and anxiety were associated with a negative problem-solving orientation, but only depression was associated with more negative appraisals of actual problem-solving skills. The results suggest that perceived exposure to imposed standards of perfection undermines the problem-solving process and that individuals with high levels of socially prescribed perfectionism are particularly in need of counseling interventions designed to provide a more positive problem-solving orientation.This research was supported by grants #410-91-0856 and #410-93-1256 from the Social Sciences and Humanities Research Council of Canada. An earlier version of this paper was presented at the 1994 annual meeting of the Eastern Psychological Association in Providence, Rhode Island. The authors wish to thank Shawn Mosher for his assistance with the data collection.     

Differential sensitisation to central cardiovascular effects of angiotensin II in rats with a myocardial infarct: relevance to stress and interaction with vasopressin

The purpose of the present study was to elucidate if rats with myocardial infarction manifest altered responsiveness to central cardiovascular effects of low doses of angiotensin II (ANG II), and if ANG II and vasopressin (VP) cooperate in the central regulation of cardiovascular functions at rest and during stress. Conscious Sprague-Dawley rats with myocardial infarction induced by left coronary artery ligation, or sham-ligated (SL) controls were infused intracerebroventricularly with artificial cerebrospinal fluid (aCSF), ANG II, ANG II + VP or ANG II + V1a receptor antagonist (V1ANT) 4 weeks after cardiac surgery. In the infarcted but not in the SL rats, the resting mean arterial blood pressure (MABP) was significantly elevated by infusions of ANG II and ANG II + VP, while infusion of ANG II + V1ANT was not effective. During administration of aCSF, the pressor, and tachycardic responses to an air-jet stressor were significantly greater in the infarcted than in the SL rats. In the SL rats, the pressor responses to the stressor were significantly greater during infusions of ANG II, ANG II + VP and ANG II + V1ANT than during infusion of aCSF. The tachycardic response in the SL rats was enhanced only by the combined infusion of ANG II + VP. In the infarcted rats, the pressor and the tachycardic responses to the stressor were similar in all groups. It is concluded that: (1) under resting conditions the infarcted rats manifest sensitisation to the central pressor effect of ANG II and that this effect depends on concomitant stimulation of V1a VP receptors, (2) central ANG II may enhance the pressor response to an alarming stressor in the SL rats through an action which does not depend on the concomitant stimulation of V1a receptors, (3) the cooperative action of ANG II and VP is required for intensification of the tachycardic response to the alarming stressor in the SL rats and (4) exaggeration of the cardiovascular responses to the alarming stressor in the infarcted rats cannot be further augmented by an additional stimulation of central ANG II receptors or combined stimulation of ANG II and VP receptors.     

Tracking 10-year competitive winning performance of judo athletes across age groups

Little information is available concerning early specialization and competitive success in judo across the early training years. Thus, the present objective was to verify the stability of individual competitive performance of a state-level championship for judo athletes who had been previously successful. For this, 406 athletes from six age groups (9 to 20+ years old) of each sex were followed for 10 years. Using recorded data from the S?o Paulo State Judo Federation beginning in 1999, the scores and standings for these judo players were analyzed. The proportion of medal winners during this period was not constant, differing from the grand mean in all groups of both 204 males and 202 females. At the end of this period, only 7% of the male and 5% of the female athletes had maintained their competitive levels. Successful competitive performance in early judo competition was not associated with success later in adulthood.     

Towards Universal Reconciliation: The early development of Amadou Hampâté Bâ's ecumenical ideas

Personal relationships between Muslims and Christians do not occupy a prominent place in the written history of Muslim-Christian relations. Nevertheless, their significance for mutual understanding and spiritual enrichment is important, as the example given in this article shows. During the last 25 years of his life Amadou Hampâté Bâ (d. 1991) came to be recognized internationally for his active religious tolerance. However, the beginnings of the formative process of his attitude of openness and ecumenical ideas have remained largely unexplored. This article draws on the material found in the generally unpublished letters which Hampâté Bâ wrote to Théodore Monod, the director of the Institut Français d'Afrique Noire in Dakar, in the 1940s and 1950s during the middle years of his life. It was within the context of rich friendship between these two men that Hampâté Bâ's desire to work for universal reconciliation started to attain a more definite outline.     

‘Vie with Each Other in Good Works’: What Can a Roman Catholic Missionary Order Learn from Entering into Closer Contact with Muslims?

The article deals with concerns and hopes regarding something commonly known as Christian missionary activity, which in Africa has tended to see Muslims as rivals in a race for the souls of the adherents of African indigenous religions. After explaining the meaning of a dialogue-based approach to missionary work, the focus is on matters concerning the Society of the Divine Word (SVD) and its new involvement in Chad. Such an analysis is essential if the SVD is going to change the perception of Christian mission from an exercise in religious imperialism to a dialogical way of searching together for the signs of God's presence. The latter will involve closer contact with Muslims and hopefully will incline SVD missionaries to a more thorough adoption and implementation of a dialogical way of carrying out their ministry, one based on profound and conscious respect for others.