Forms of memory failure in schizophrenia.

Effortful and automatic memory task performances were examined in 36 schizophrenic patients and 18 normal control Ss. Tasks included free recall, recognition, and frequency estimation. Patients demonstrated impairment in recall, in recognition, in semantic encoding, and in frequency estimation. Deficits were observed across tasks despite differences in attentional demands. The results suggest a basic compromise of memory function, which is consistent with recent neuroimaging evidence of structural or physiological abnormalities in frontal and temporal lobe structures in schizophrenia.     

Ratings of Orally Presented Verbal Expressions of Probability by a Heterogeneous Sample

Verbal expressions of probability are used in daily conversations, physician-physician and physician-patient communications, and questionnaire and interview responses. To assess the degree of agreement among English-speaking Australian adults in allocating numerical probabilities to these verbal expressions of probability, 966 interviewees provided estimates for 60 isolated expressions of probability and a sequence of seven items placed in a sequence. Means and median scores appeared to be consistent with common sense and with findings from other countries. Mirror-imaged terms were neither symmetrical nor equidistant, with the means and medians for the positive terms being closer to the mid-points of the scale than the means and medians of the negative terms. Items in a sequence of probability terms showed greater symmetry and less variability than isolated expressions. For most items, there was an unacceptably high level of within-subject and between-subject variability. Although subjects with higher levels of education and/ or mathematics education showed less variability, these factors accounted for very little of the variance. The greater variability in Australian results relative to those reported elsewhere was partly attributed to the use of interviews rather than questionnaires. There were no particular stems that yielded greater consistency. It was concluded that the use of these expressions leads to very imprecise communication.     

Parallel distributed processing and neuropsychology: A neural network model of Wisconsin card sorting and verbal fluency

Neural networks can be used as a tool in the explanation of neuropsychological data. Using the Hebbian Learning Rule and other such principles as competition and modifiable interlevel feedback, researchers have successfully modeled a widely used neuropsychological test, the Wisconsin Card Sorting Test. One of these models is reviewed here and extended to a qualitative analysis of how verbal fluency might be modeled, which demonstrates the importance of accounting for the attentional components of both tests. Difficulties remain in programming sequential cognitive processes within a parallel distributed processing (PDP) framework and integrating exceedingly complex neuropsychological tests such as Proverbs. PDP neural network methodology offers neuropsychologists co-validation procedures within narrowly defined areas of reliability and validity.     

The relations between type A behavior, clinically relevant behavior, academic achievement, and IQ in children

The relation of Type A behavior to IQ, academic achievement, and several clinically relevant dimensions of behavior in children was assessed in 873 fourth, fifth, and sixth graders by means of the Matthews Youth Test for Health (MYTH), the Cognitive Abilities Test (CAT), the Iowa Tests of Basic Skills (ITED), and the teachers' form of the Missouri Children's Behavior Checklist (MCBC-T). The MYTH and its competitiveness and impatience-aggression subscales were found to be differentially related to academic achievement and to account for a small but significant portion of the variance in achievement not accounted for by IQ. The subscales of the MYTH were found to be highly correlated with several clinically familiar dimensions of children's behavior. The significance of these findings for the construct validity of the MYTH is discussed.     

Belief in afterlife as a moderator of fear of death?

Investigating the notion that belief in afrerlife (BA) serves the function of helping the individual to deal with fear of death, a study was designed to explore the effect of public commitment to religion, repression-sensitization, and anticipatory concern with death and dying on BA, and examine the relationship between BA and state anxiety. Fifty students of theology and fifty students of various other subjects responded to a German version of Byrne's R-S scale, and then were randomly assigned to two conditions: they either worked through Thanatos-Questionnaire, and thereby were confronted with death and dying for about 15 to 20 minutes, or filled out a questionnaire unrelated to the topic. Thereupon, a BA scale was administered, and at last, subjects responded to a scale measuring state anxiety. The findings of Osarchuk and Tatz (1973) that religiously committed persons are strengthening BA after being confronted with death and dying could not be replicated. However, among subjects with no public commitment, those concerned with death and dying scored significantly lower on BA than those not concerned. This effect was especially observed among students classified as sensitizers. Because changes of BA did not correspond with changes of within cell correlations between BA and state anxiety, an alternative explanation of the findings in terms of dissonance theory is put forward.     

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.