Normative systems of discovery and logic of search

New computer systems of discovery create a research program for logic and philosophy of science. These systems consist of inference rules and control knowledge that guide the discovery process. Their paths of discovery are influenced by the available data and the discovery steps coincide with the justification of results. The discovery process can be described in terms of fundamental concepts of artificial intelligence such as heuristic search, and can also be interpreted in terms of logic. The traditional distinction that places studies of scientific discovery outside the philosophy of science, in psychology, sociology, or history, is no longer valid in view of the existence of computer systems of discovery. It becomes both reasonable and attractive to study the schemes of discovery in the same way as the criteria of justification were studied: empirically as facts, and logically as norms.     

Automatic and effortful processing in Attention Deficit/Hyperactivity Disorder

Twenty-five boys with Attention Deficit/Hyperactivity Disorder and 23 age-matched controls were compared on verbal memory tasks differentiating automatic versus effortful information processing. Automatic processing tasks included the recognition of new or old words in a list and the recognition of frequency of occurrence of words in a list. Effortful tasks included free recall of lists of both related and unrelated words. Hyperactive boys did not differ from controls in automatic processing capabilities but demonstrated significantly poorer effortful processing. Intercorrelations of the variables revealed high correlations between scores on effortful measures and also raise questions about the purity of automaticity in some tasks employed. Stepwise discriminant analysis demonstrated that free recall of related words (an effortful task) best discriminated between groups. Effort-related processing in hyperactive and normal children is discussed in relation to variables of motivation, affect, arousal, and other higher-order cognitive processes.     

Adjustment and readjustment of the relative timing of a motor pattern

Summary The hypothesis of a generalized motor program with relative timing as an invariant characteristic is contrasted with a continuity hypothesis. According to this hypothesis, temporal characteristics are determined by the same parameters of a generalized motor program as spatial characteristics are; different temporal patterns are assumed to be associated with different costs. In two experiments uniarticular arm movements with different relative timing were studied. Three results were obtained that support the continuity hypothesis. (1) Reproductions exhibited asymmetric biases, that is, reproductions of one target pattern were biased toward the other, but not vice versa. (2) Readjustment to a new target pattern that had a correlation of almost zero with the practice pattern was not immediate, as found by Heuer and Schmidt (1988), who used more similar patterns. This suggests that readjustment of a temporal pattern depends on the similarity between the old and the new patterns. (3) Readjustment to another target pattern that had been practiced before was immediate for similar patterns, but not immediate for dissimilar patterns. The effects of the similarity of different temporal patterns on readjustment are not consistent with the view that each temporal pattern is governed by its own generalized motor program.     

The battle within the self, 1: An existential framework for understanding personality disorders

A new phenomenologically based model for understanding personality disorders is presented. This model draws upon the existential concepts of Dasein and pitch to explain how individuals with personality disorders have extremely constricted and rigid experiences of the world. When they were children, these individuals internalized and retained hypercritical, sadistic parental messages. Such covert parental voices are misidentified as rational evaluations by these patients who are deficient in their capacity to engage in rational self-evaluation. When these individuals are encouraged to observe and report upon the internalized self-attacks, their observing ego is strengthened and an effective groundwork is set for ultimate changes in behavior.     

The clinical popularity of object relations concepts

Object relations theory has the effect of supporting the psychoanalyst when he feels that the patient's effort is strongly opposed to his own. The current popularity of object relations theory may be related to the gradual disappearance from Freudian theory of a simple, clear image of an obligatory insistence by the patient that is useful even though it is unreflective. Object relations theory offers the practitioner a way of fortifying himself against blind demand, while newer Freudian theorists cope with the problem by orienting themselves more stringently toward the original paradigm of optional choice.     

Seeing versus imagining movement in depth

Subjects judged the quality of rigid motion between pairs of three-dimensional drawings that differed by a rotation in depth. The figures were aligned with, and rotated around, either the vertical axis or an axis that was oblique with respect to the XYZ co-ordinate system. Rated quality of motion decreased with increasing angular disparity between the figures and with decreasing stimulus duration, regardless of whether the figures were vertical or oblique. The same subjects then participated in a mental rotation task using the same stimuli and angular disparities. An effect of principal axis emerged, such that subjects took longer to make decisions about obliquely aligned stimuli than about vertically aligned stimuli, especially if they received the oblique stimuli first. These data imply that perceived versus imagined movement through the same trajectory involves different processes. Whereas the apparent motion system performs its computations relatively automatically, the processes involved in mental rotation are more strategic in nature.     

Relationships among measures of alcohol drinking behavior, life-events and perceived stress

Two measures of stress (life-events and perceived stress) and a measure of alcohol-drinking behavior were administered to 6,747 adult males. Analysis was carried out to examine the extent to which subjects classified into drinking-behavior groups differed on stress measures while controlling for age, income, and race. Significant differences held up under age, race, and income controls for life-events and perceived stress between the abstinence, common-use, and problem-drinking groups. Stress scores increased sequentially across the drinking-behavior groups. Apparently, men who are life-long abstainers (teetotallers) experience fewer life-events and perceive less stress than moderate drinkers, while moderate drinkers experience less stress than heavy drinkers.     

Learning mnemonics: roles of aging and subtle cognitive impairment

Previously validated methods of memory training were used in conjunction with the Folstein Mini-Mental State Examination (MMSE) to explore the relationship between complexity of learned mnemonic, aging, and subtle cognitive impairment. Subjects were 218 community-dwelling elderly. Treatment included imagery mnemonics for remembering names and faces and lists. There was a significant interaction among age, type of learning task (face-name vs. list), and improvement when controlling for MMSE score. There was also a significant interaction among MMSE score, type of learning task, and improvement when controlling for age. Scores on the more complex list-learning mnemonic were more affected by age and MMSE scores than were scores on the face-name mnemonic. Implications of the findings for cognitive training of the old old and the impaired are discussed.     

Impression formation: the role of expressive behavior

This research examined the effects of personality/social skills and individual differences in expressive style on impression formation. Particular attention was given to the role of nonverbal behaviors in the formation of initial impressions. Sixty-two subjects were measured on self-report personality and communication skill scales, on posed emotional sending ability, and on physical attractiveness. Subjects were then videotaped while giving a spontaneous "explanation." Trained coders measured five separate nonverbal cue factors displayed by the subjects in the videotapes. Groups of untrained judges viewed the tapes and rated their impressions of the subjects on scales of likability, speaking effectiveness, and expressivity-confidence. Male subjects who were nonverbally skilled and extraverted tended to display more outwardly focused and fluid expressive behaviors, and made more favorable impressions on judges, than did males who scored low on the measures of nonverbal skills and extraversion. Females who were nonverbally skilled displayed more facial expressiveness, which led to more favorable initial impressions. Sex differences may reflect basic differences in the acquisition and use of expressive nonverbal cues by males and females.