The numerical taxonomy of acute and chronic aphasic syndromes

Summary Acute (n=179) and chronic (n=113) aphasic populations were studied by numerical taxonomy. Clustering based on the objective and standardized language scores of the WAB yielded significant differences for the acute and chronic groups. The overlap between objective clustering and clinical typology, also based on test scores, was sufficient to allow us to interpret the data in clinical terms. The decrease of the global cluster and of Wernicke's cluster and the appearance of new clusters, such as the mixed global-Broca's, the partially recovered Broca's — mild anomic, and the recovered Wernicke's-semantic groups, and the further dichotomy of afferent and efferent conduction clusters were observed. Recovering patients are often reclassified as anomics; this changes the anomic clusters, loading one with patients who fall into the recovered category. Chronic clusters appeared more distinct with less overlap. The trends in both data sets were investigated by principal components analysis. This showed that all language scores contributed to the first component in both populations fairly evenly. Therefore, the main contribution to the first component was severity (the combination of scores). Comprehension and fluency were the major contributors to the second root in both populations, indicating the diagnostic significance of these parameters. Repetition featured more prominently in the second root of the acute, than the chronic population.     

Immaturity,delinquency, and the WechslerP > V sign

The classic psychodiagnostic sign for delinquency —Wechsler Performance IQ being higher than Verbal IQ —has shown generally good validity, improvable by a modifier variable (Warren's I -level system). Reasoning from the I-level immaturity theory of delinquency, the present study investigated age as a possible substitute for the I-level in its role as a moderator variable for the Wechsler P> Vsign, within a population of male juvenile delinquents. As hypothesized, young age predicted a high P > Vscore, supporting the immaturity theory of delinquency. Types of immaturity are discussed. Future work should test the P > Vsign as an aid in evaluating delinquency treatment methods.     

An attempt to condition components of urine formation in dogs

Previous research on the renal conditional reflex (CR) has resulted in contradictory data. The work of Bykov with dogs and of Hoferet al. with humans indicated that a renal CR is possible, but the experiments of Corsonet al. and Watt and Gantt with dogs having normal or transplanted cervical kidneys showed no clear-cut renal CR’s. The present work supports the latter finding. Three female mongrel dogs were used. One dog (normal) had an externalized ureter; the other two (experimental) had denervated cervical kidneys (autografts). In 155 days of experiments, the investigators found diuresis to occur only on unconditional stimulus,i.e., only when a dog drank diluted milk (one part milk to four parts water)ad lib.; the dogs drank an average of between 500 and 1,100 ml. No diuresis occurred when 30 ml. of the mixture were given (conditional stimulus). Urinalysis indicated a lack of renal conditioning with respect to the excretion rates and the concentrations of creatinine and electrolytes, except for the sodium concentration in the normal dog’s urine, which decreased on bothad lib and test (30 ml) days; the volume was not affected. Conclusion: Drinking a small quantity of diluted milk as a conditional stimulus did not produce a conditional diuretic response either in the normal dog or in the two dogs with transplanted kidneys.     

Familiarity decisions for faces presented to the left and right cerebral hemispheres

Right-handed subjects were asked to decide whether or not faces presented briefly in the RVF or in the LVF were familiar (familiar faces were those of famous people). This task avoids the need for extensive semantic processing or temporary storage involved in conventional naming or identification tasks, and thus eliminates the contribution of such factors to any observed asymmetry. The resulting finding of faster reaction times to LVF faces, with no overall visual hemifield difference in error rates, is taken to indicate a right-hemisphere superiority either in the processes used to construct facial representations or in the accessing of face recognition units, or both.     

Group therapy for bulimia: Clinical experience and practical recommendations

The authors identify and describe three major types of group therapy for patients with bulimia. Psychodynamic treatment, cognitive-behavioral treatment, and self-help group treatment are techniques with different theoretical bases. Implications for group membership, time frame, leadership, contract, content, and goals are discussed for each type of group treatment. Outcome studies are reviewed, and recommendations are offered for a rational approach to the group treatment of patients with bulimia.Supported in part by a grant from the Gen-Rad Foundation.     

An investigation of children's fears and their mothers' fears

Children (75 female, 52 male) in grades 2 through 8 completed the Fear Survey Schedule for Children (FSS-FC). Their mothers completed the same questionnaire twice: once for themselves and a second time to estimate their children's fears. Spearman's rhos indicated that there was a high degree of correspondence between the mothers' rank-ordered estimates of their children's fears and the children's rank-ordered self-reports (=.86 for males, =.96 for females.However, mothers' overall estimates of their children's general fearfulness were significantly correlated only with their daughters' fearfulness, not with their sons'. Further analyses showed that mothers could generally identify their children's highest-rated fears. All test-retest measures were significant. In summary, these results suggest that mothers may provide useful clinical information about their children's specific fears and that the FSS-FC is a reliable instrument with which to assess children's fears.     

Changing industry to continuous operations: Different strokes for different plants

A survey method was designed to evaluate the effect of shift work on industrial workers and to develop recommendations for 7-day around-the-clock production work systems. A Work-Sleep Survey was then offered to 2,340 hourly and salaried workers at four plants. Each plant was in the rubber and plastic products industry and on 5-day around-the-clock operations using permanent shifts. Of the total workers, 90.38% responded to the survey. The results agree with the findings of a previous survey, offered to workers through their unions, using many of the same survey items. The plants were found to differ in worker demographics, habits, and preferences. This survey method is helpful as an aid for the design and evaluation of shift-work systems tailored to specific worker and plant requirements.     

Gregory of Nyssa and Divine Simplicity: A Conceptualist Reading

Andrew Radde‐Gallwitz probes Gregory of Nyssa on divine simplicity, a topic that Radde‐Gallwitz treated earlier in a book‐length monograph and takes further here in response to critics. As he notes, the Cappadocians and their opponents shared belief in divine simplicity. But for Gregory, simplicity functions as part of affirming the co‐equal divinity of the Father and Son, against his opponents. Radde‐Gallwitz lists six negative claims that Gregory’s understanding of divine simplicity supports: (1) God is immaterial; (2) God is without parts; (3) God does not possess any perfection “by acquisition”; (4) God does not possess any perfection “by participation”; (5) in God, there is no mixture or conflux of qualities, especially opposite qualities; (6) in God, there are no degrees of more or less. Yet with regard to positive statements about God’s perfections—for example the relation of God’s goodness to God’s wisdom—things are more difficult, as Radde‐Gallwitz shows. Interpreters of Gregory have differed sharply on this issue, in part because Gregory does not make his position crystal clear. Radde‐Gallwitz himself earlier held that Gregory considers God to have real but non‐definitive perfections distinct from the divine essence. Indebted to Richard Cross, however, Radde‐Gallwitz here adjusts his view, distinguishing more firmly between the divine essence itself and our limited concepts. He draws upon the Platonic distinction between natural and conventional naming, which differ in their accounts of what makes words meaningful. Arguing that Gregory is a “naturalist,” he reads Gregory’s texts on divine simplicity in this light.     

Do Additional Features Help or Hurt Category Learning? The Curse of Dimensionality in Human Learners

The curse of dimensionality, which has been widely studied in statistics and machine learning, occurs when additional features cause the size of the feature space to grow so quickly that learning classification rules becomes increasingly difficult. How do people overcome the curse of dimensionality when acquiring real‐world categories that have many different features? Here we investigate the possibility that the structure of categories can help. We show that when categories follow a family resemblance structure, people are unaffected by the presence of additional features in learning. However, when categories are based on a single feature, they fall prey to the curse, and having additional irrelevant features hurts performance. We compare and contrast these results to three different computational models to show that a model with limited computational capacity best captures human performance across almost all of the conditions in both experiments.