Physiological reactivity to stressors in irritable bowel syndrome patients, inflammatory bowel disease patients and non-patient controls.

Irritable Bowel Syndrome (IBS) patients were compared with Inflammatory Bowel Disease (IBD) patients and non-patient controls on four separate physiological measures (heart rate, finger-tip temperature, skin resistance level, and forehead EMG) for their physical reactivity to 'laboratory stressors'. It was predicted that the IBS patients would respond to these stressors with more physiological reactivity than the two other groups. There were initial basal differences among the groups on heart rate and finger-tip temperature: in general, the IBS patients had lower basal heart rates and the non-patient controls had lower finger-tip temperatures. These findings are contrary to the previous body of literature regarding possible sympathetic nervous system (SNS) arousal states in the IBS patient. The results also indicated IBS patients were not significantly different than the IBD patients or the non-patient controls in their reactivity to stressors. Previous literature has suggested that IBS in their reactivity to stressors. Previous literature has suggested that IBS patients have an enhanced SNS arousal or an SNS mediated reactivity to environmental stressors, our current study has not found these results.     

Two controlled evaluations of multicomponent psychological treatment of irritable bowel syndrome.

We report two controlled comparisons of a previously validated multicomponent (relaxation, thermal biofeedback, and cognitive therapy) treatment for irritable bowel syndrome (IBS) to an ostensible attention-placebo control (pseudo-meditation and EEG alpha suppression biofeedback) and to a symptom-monitoring control. In Study 1 (n = 10 per condition) there were nonsignificant trends for the multicomponent treatment to be superior to the attention-placebo condition. In Study 2 (n = 30 per condition), we found no advantage for the multicomponent treatment over the attention-placebo condition. Subjects in both treatment conditions showed significant reductions in GI symptoms, as measured by daily symptom diaries, and significant reductions in trait anxiety and depression. The GI symptom reductions held up over a 6 month follow-up. Possible explanations for the results are explored.     

THE INTERPLAY BETWEEN SCIENCE AND THEOLOGY IN UNCOVERING THE MATRIX OF HUMAN MORALITY

Abstract. Theology and the life sciences are mutually dependent on one another in the task of understanding the origin and function of moral behavior. The life sciences investigate morality from the perspective of the historical and communal dimension of humanity and point to survival as the primary function of human behavior. A Christian ethic of self-sacrifice advances the preservation of the entire human and nonhuman creation and should not, therefore, be objected to by the life sciences. Religion, however, is more than a survival mechanism. It points to a preserving agency beyond humanity and prevents the life sciences from reducing life to its strictly biological side.     

A diffusion model of early visual search: Theoretical analysis and experimental results

Summary Meinecke (1989, Exp. 1, cond. HO) showed that the detectability of a visual target embedded in a linear noise array decreases with increasing retinal eccentricity, while the reaction time (RT) of the hits increases. One of the most interesting features of her results was that the RT of the correct rejections is consistently larger than the RT for signals presented near the fovea. This finding suggests that initially visual attention is concentrated near the fixation point and then diffuses across the stimulus array to perform a serial, exhaustive search. We present a diffusion model of early visual-search processes that quantitatively describes this evolution of attention in time and space; in contrast to most previous conceptions, it is based on a genuine relation between the spatial and temporal dimensions of the search processes performed. The model predicts quantitatively both detection performance and RT. We conducted an experiment similar to that of Meinecke (1989), but with an additional variation of the presentation time. All the main features of the 189 predictions could be explained by the model. The interpretation of the four model's parameters is discussed in some detail and compared with previous estimates of the microscopic search speed derived from alternative models. Finally, we consider some possible modifications related to results of Kehrer (1987, 1989), and some generalizations to multi target detection and two-dimensional stimulus arrays.     

The informative functions of research procedures: Bias and the logic of conversation

Conversational rules of everyday communication are applied to the interaction between experimenters and subjects. According to these rules, contributions to a communication should be informative, relevant, true, and unambiguous. It is assumed that subjects determine the pragmatic meaning of instructions and questions on the basis of these rules and the provided context. In contrast to most natural settings, standardized experimental procedures rarely allow for an interactive determination of pragmatic meaning and often preclude feedback as a corrective device. As a consequence, subjects are required to rely heavily on general rules, and even subtle cues may become informationally loaded. The information extracted from context cues may often not be intended by the experimenter. Thus subjects may infer more than they are supposed to, resulting in discrepancies between the experimenter's intended and subjects' inferred meaning of the instructions. If researchers are not sensitive to the information provided by verbal and non-verbal context cues, their interpretation of research results may be based on biased data. Evidence from different research domains is reported to support the presented assumptions and their implications for bias avoiding strategies are discussed.     

Interactive effects of writing and reading a persuasive essay on attitude change and selective exposure

Subjects wrote an essay either supporting their own position on an issue or irrelevant to that issue. Subsequently, they received a communication that either supported or opposed their position, and that either claimed to present the only reasonable position or acknowledged the viability of alternative positions. Then, they reported their own beliefs in the position being advocated, and finally were given an opportunity to obtain subsequent information that either supported or opposed this position. Attitude change in the direction of a proattitudinal communication occurred only when both (a) this communication asserted that only the position advocated was defensible and (b) subjects had previously written a proattitudinal essay themselves. Moreover, either of these factors was sufficient to prevent attitude change in the direction of a counterattitudinal communication. Data supported predictions based upon a joint consideration of commitment and reactance effects. Subjects' subsequent preference for supporting over opposing information was greater when they had written a supporting essay than when they had not, greater when they had read an opposing communication than when they had read a supporting one, and greater when the communication they read was presented as stating the only reasonable position, no matter which position it advocated.     

Effects of salience of rape on sex role attitudes,trust, and self-esteem in non-raped women

Women who thought about rape prior to answering questions about themselves reported lower self-esteem, stronger belief in traditional sex roles, and lower trust in other persons than women who were not induced to think about rape. Achievement motivation and locus of control, on the other hand, were not affected by the salience of rape. The data suggest that rape has an intimidating effect on non-raped women as previously suspected in feminist literature, although not all variables suspected may be affected.     

Input restriction and immediate memory decay in normal and subnormal children

Twelve imbeciles and 12 normals, matched for their digit memory span, were presented with three digit numbers successively and simultaneously. Seven speeds of presentation were used. Each simultaneous speed of presentation had a corresponding successive speed. Subjects were required to recall digits on the conclusion of presentation of each number. Each performance was scored as the number of errors for each digit. With simultaneous presentations the difference between the groups was significant only at fast presentation speed, where the normals were significantly better than the imbeciles. Imbeciles improved at slow speeds and became as good as normals. In the case of successive presentations differences between groups occur only in relation to the second digit, which the normals remember better than the subnormals. Both groups remember the first digit worst as rates of presentation become progressively slower. Results are explained in terms of input restriction and of memory trace decay.