The effects of chronic sleep reduction on the performance of cognitive tasks sensitive to sleep deprivation

In four sleep loss experiments we aimed, first, to compare performance during long-term sleep reduction with performance during short-term total sleep deprivation, and second, to measure the effects of both methods of sleep loss on ability to ignore distracting irrelevant stimuli, using a finding embedded figures test (FEFT). Logical reasoning, auditory vigilance and finding embedded figures tasks were shown to be significantly sensitive to one night's sleep deprivation. However, in one sleep reduction study subjects reduced to a mean of 5.2 hours sleep per night for 4 weeks showed no performance deficits on logical reasoning. In a second sleep reduction study subjects reduced to a mean of 4.3 hours sleep per night for 4 nights, and subjects reduced to a mean of 5.3 hours sleep per night for 18 nights, showed no performance deficits on logical reasoning or auditory vigilance, despite their reports of severe increases in subjective sleepiness and reduced concentration. Both these sleep reduction groups, though, did show decrements on the FEFT, which we interpret in terms of dearousal increasing distractibility, which the sleep-reduced subjects could not overcome with effort, as they did with the other tests.     

Self psychology,intersubjectivity, and group psychotherapy

The basic concepts of self psychology are presented. The three self-object transferences of mirroring, idealizing, and twinship are described and applied to group therapy. The therapist's role is: 1) to accept the patient's need to idealize the leader, the group, or the specific members; 2) to receive recognition and admiration; and 3) to understand the patients search for twinship. The group therapist also has the responsibility of teaching group members to have empathy for one another.     

Understanding the effects of sample size on the variability of the mean

In the first three experiments, we attempted to learn more about subjects' understanding of the importance of sample size by systematically changing aspects of the problems we gave to subjects. In a fourth study, understanding of the effects of sample size was tested as subjects went through a computerassisted training procedure that dealt with random sampling and the sampling distribution of the mean. Subjects used sample size information more appropriately for problems that were stated in terms of the accuracy of the sample average or the center of the sampling distribution than for problems stated in terms of the tails of the sampling distribution. Apparently, people understand that the means of larger samples are more likely to resemble the population mean but not the implications of this fact for the variability of the mean. The fourth experiment showed that although instruction about the sampling distribution of the mean led to better understanding of the effects of sample size, subjects were still unable to make correct inferences about the variability of the mean. The appreciation that people have for some aspects of the law of large numbers does not seem to result from an in-depth understanding of the relation between sample size and variability.     

Maximizing split-half reliability estimates for projective techniques

Hand Test data from comparable sets of clinical samples were analyzed for reliability using the usual odd-even split and then also calculating all possible (126) split-half combinations. Maximum stable reliabilities were obtained which were substantially superior to the odd-even method. It was concluded that projective tests are probably more internally reliable than has heretofore been reported.     

Sexual,body-image,and personality attitudes in anorexia nervosa

Assessment of adolescent females with anorexia nervosa was carried out at the time of hospitalization and again at discharge. Findings were compared to those from a normal weight control group. The anorexic subjects at the start of treatment indicated significantly negative attitudes about sexual issues. They also reported a significantly poorer self-evaluation of their body, personality, and social skills than was evident in the comparison group. An improvement in attitude regarding these issues was demonstrated by the end of treatment. The function of weight loss in dealing with these problem areas was discussed.     

THE EFFECT OF STUDY SKILL TRAINING ON LEARNING DISABLED STUDENTS' RETELLING OF EXPOSITORY MATERIAL

This research was conducted to determine the effects of a study skill training procedure on oral retelling of printed expository material read by three intermediate-grade learning disabled students. Measures of story retelling, study characteristics, and answers to comprehension questions were obtained during each session. The study skills taught during the intervention phase involved a modified Study, Question, Read, Recite, and Review technique (Robinson, 1941). Findings confirmed the existence of a functional relationship between the use of the study skill procedure and improved retelling. Experimenter directions and assistance were systematically faded so that during postchecks students used the procedure easily and quickly while obtaining their highest scores for retelling.     

A BIOLOGICAL INTERPRETATION OF MORAL SYSTEMS

Abstract. Moral systems are described as systems of indirect reciprocity, existing because of histories of conflicts of interest and arising as outcomes of the complexity of social interactions in groups of long-lived individuals with varying conflicts and confluences of interest and indefinitely iterated social interactions. Although morality is commonly defined as involving justice for all people, or consistency in the social treatment of all humans, it may have arisen for immoral reasons, as a force leading to cohesiveness within human groups but specifically excluding and directed against other human groups with different interests.     

The development of race‐based perceptual categorization: skin color dominates early category judgments

Prior research on the development of race‐based categorization has concluded that children understand the perceptual basis of race categories from as early as age 4 (e.g. Aboud, 1988). However, such work has rarely separated the influence of skin color from other physiognomic features considered by adults to be diagnostic of race categories. In two studies focusing on Black–White race categorization judgments in children between the ages of 4 and 9, as well as in adults, we find that categorization decisions in early childhood are determined almost entirely by attention to skin color, with attention to other physiognomic features exerting only a small influence on judgments as late as middle childhood. We further find that when skin color cues are largely eliminated from the stimuli, adults readily shift almost entirely to focus on other physiognomic features. However, 6‐ and 8‐year‐old children show only a limited ability to shift attention to facial physiognomy and so perform poorly on the task. These results demonstrate that attention to ‘race’ in younger children is better conceptualized as attention to skin color, inviting a reinterpretation of past work focusing on children's race‐related cognition.