Variations on the Ramsey test: More triviality results

The purpose of this note is to formulate some weaker versions of the so called Ramsey test that do not entail the following unacceptable consequenceIf A and C are already accepted in K, then if A, then C is also accepted in K. and to show that these versions still lead to the same triviality result when combined with a preservation criterion.     

Autobiographical memory impairment in chronic schizophrenia: Significance and clinical correlates

Previous studies of autobiographical memory (AM) in schizophrenia yielded a reduction of specificity, richness of details and conscious recollection, which indicate both, quantitative and qualitative AM changes. However, their associations with psychopathological symptoms and neuropsychological deficits were not resolved. Therefore, we sought to investigate AM with respect to psychopathology and neuropsychology in patients with chronic schizophrenia to rule out the influence of different courses of the disease. AM of four lifetime periods was examined in 75 patients and 50 healthy controls by using a semi-structured interview. The recalled episodes were rated for memory specificity. Subsequently, one single event of each period of life was rated for details and experiential aspects of reliving (originality, vividness/visual imagery, emotional re-experiencing and emotional valence). When contrasted with healthy controls, patients recalled a significantly reduced number of episodes and personal semantic facts; moreover, memory specificity of AM was significantly lower in patients than controls. While the richness of details calculated for single events showed only minor, non-significant group differences, vividness and emotional re-experiencing were significantly less pronounced in the patient group. Along with this, AM performance correlated significantly with negative symptoms including apathy as well as verbal memory and executive functions. Our results underline the significance of overgenerality as a key feature of AM in schizophrenia as well as a dissociation between intact number of details of single events and reduced vividness and emotional re-experiencing. The extent of negative symptoms including apathy and impairments of verbal memory/executive functions may explain AM deficits in chronic schizophrenia.     

Self-image,perception of peers' risk acceptance and risky shift

Twelve four-person female groups of subjects displaying the typical underestimation of their peers' (relative to their own) risk acceptance were compared with twelve groups of subjects who (slightly) overestimated their peers' risk acceptance. Risk level was measured by responses to a set of hypothetical decision situations known to elicit risky shift on the basis of previous research. Risky shift following group discussion was not found to be different for the two types of groups, casting doubt on the widely suggested role of peer underestimation in risky shift. Nor was risky shift affected by whether or not group members stated their individual decisions publicly at the close of discussion. Larger group risky shifts were accompanied by higher self-ratings given by group members on a number of polarity scales. In discussing the findings, we outline an explanation of group-induced shifts in risk taking, emphasizing the motivational and informational inducements provided by group discussion whereby group members come to discard their prior positions in favor of more aspired ones.     

Factors limiting the generality of the risky-shift phenomenon

While a considerable amount of research has centered on explaining the risky shift (enhancement of risk acceptance through group discussion; see, for example, Dion, Baron, and Miller, 1970), few studies have investigated the generality of the phenomenon. Three of several ways in which the laboratory context is usually lacking of reality are: (a) The decision consequences are imaginary, as in the ‘Choice-Dilemma’ situations used in most of the risky-shift research; (b) the decision consequences - even if they are real (e.g. money) - are slight; and (c) the decisions are made for oneself (whereas in real life many decisions involve agents acting on behalf of others). The present study was designed to investigate the effects of the above three factors - type of incentive, magnitude of stake and decision target - using a betting task as the decision situation.     

Die Interpretation naturaler und sozialer Regelkreise in der marxistischen Philosophie

Ohne Zusammenfassung     

Towards an empirical calculus of reinforcement value

Only one of two keys reinforces the subject with food. This key can assume one of two colors, each associated with a different fixed-ratio schedule for obtaining reinforcement. The function of the second key is to permit the animal to switch from the long schedule to the short schedule. If the difference between the ratio schedules is large enough, a preference for the shorter schedule is demonstrable. A quantitative index of preference is obtained as follows: each time the animal switches to the shorter schedule, the number of pecks required to produce the next switch is increased. As the “ante” on the switching key increases, the effective difference between the two ratio schedules decreases. After each food reinforcement, when the bird is exposed to the choice-situation, it takes longer before the bird switches again. This is used to “titrate” the bird's preference. If it does not switch within x sec, the progressively increasing ratio schedule of the switching key is decreased. A specific value, in terms of a rather specific number of responses the bird settles at on the choice key, is obtained. This equilibrium is employed as a dependent variable. Several variables of which it is a function are explored.     

ATTITUDES OF SOUTH AFRICANS TOWARDS VARIOUS NATIONAL AND RACIAL GROUPS

Attitudes des Sud-Africains envers différents groupes nationaux et raciaux. En 1965, puis en 1966, un échantillon de 236 Sud-Africains blancs, ont jugé une série de 22 concepts qui désignaient principalement des groupes ethniques et diverses nationalités, à L'aide du Différenciateur Sémantique comprenant 20 paires d'adjectifs antonymes. Les résultats montrent que les attitudes à L'égard d'autres groupes ethniques sont relativement stables d'une année sur L'autre. Ils montrent, de plus, que c'est L'image du groupe en tant que tel qui détermine les attitudes des sujets à son égard, et non les différentes appellations, péjoratives ou laudatives, qui ont été utilisées pour le désigner. Une analyse factorielle a permis d'extraire trois facteurs: Image positive, Autoritatisme, Race non-blanche. Une seconde analyse factorielle, qui a porté sur les adjectifs utilisés dans le différenciateur sémantique, donne également trois facteurs: Activité, Valeur, Raisonnement, qui influencent la catégorisation des groupes ethniques visés. En conclusion, les AA. montrent que le Différenciateur Sémantique permet une analyse beaucoup plus fine que L'Echelle de Distance Sociale de Bogardus, des attitudes à L'égard des groupes raciaux et nationaux.