Directional Variability of the Isometric Force Vector Produced by the Human Hand in Multijoint Planar Tasks

Numerous studies have examined control of force magnitude, but relatively little research has considered force direction control. The subjects applied isometric forces to a handle and the authors compared within-trial variability when force is produced in different directions. The standard deviation of the force parallel to the prescribed direction of force production increased linearly with the targeted force level, as did the standard deviation of the force perpendicular to the instructed direction. In contrast, the standard deviation of the angle of force production decreased with increased force level. In the 4 (of 8) instructed force directions where the endpoint force was generated due to a joint torque in only 1 joint (either the shoulder or elbow) the principal component axes in force space were well aligned with the prescribed direction of force production. In the other directions, the variance was approximately equal along the 2 force axes. The variance explained by the first principal component was significantly larger in torque space compared to the force space, and mostly corresponded to positive correlation between the joint torques. Such coordinated changes suggest that the torque variability was mainly due to the variability of the common drive to the muscles serving 2 joints, although this statement needs to be supported by direct studies of muscle activation in the future.     

Skill Level,Vision, and Proprioception in Simple One-Hand Catching

Two experiments examined the interaction of vision and articular proprioception in simple one-hand catching. In Experiment 1 (N = 18) skilled baseball and Softball players used the left and right hands to catch slowly moving tennis balls, while Experiment 2(N = 16) used novice catchers as subjects. In half the trials, sight of the catching hand was prevented by placing a screen alongside the subjects’ face. Results of Experiment 1 revealed that the screen caused minimal disruption of the positioning phase of the catch, with moderate disruption of the grasping phase. However, for the unskilled subjects of Experiment 2, the screen caused considerable disruption of positioning. The data provide only minimal support for Smyth and Marriott’s (1982) contention that limb position is inadequately specified by articular proprioception. It is argued that skill level serves as a mediator in the ability to use proprioception for limb positioning, but vision appears necessary to control the precise temporal organization of the grasp phase of one-hand catching.     

Reexamination of the Bem Sex-Role Inventory: The Interpersonal BSRI

The 40 masculine and feminine items of 746 Bern Sex-Role Inventory (BSRI; Bern, 1974) were subjected to a principal axis factor analysis with varimax rotation. Results revealed a four-factor solution, indicating that the original BSRI items do not provide two unidimensional ratings of femininity and masculinity. However, some support is given to Bern's initial two-factor thesis in that two principal factors emerged: one consisting of items that were originally identified as feminine, the other consisting of items that were originally identified as masculine. Content examination of the two principal factors resulted in an interpretation of the factors as Interpersonal Sensitivity and Interpersonal Potency. Internal consistency and validity of these two scales were examined and found to be adequate.     

Klopfer's Prognostic Scale Used with Raven's Progressive Matrices in Play Therapy Prognosis

Summary: The influence of buffer items on response to the MarloweCrowne Social Desirability Scale (MC) was examined. Thirty-four college student subjects received MC questionnaires with intermixed extraversion and neuroticism items, while 35 others received separate MC and extraversion-neuroticism questionnaires. MC means under the two conditions differed nonsignificantly, and confidence interval estimation spoke against the likelihood of any appreciable buffer item effect. Little insight into the purpose of MC was exhibited—less than half that previously reported by Shrauger (1972)—nor was it related to the buffer item manipulation.     

A Simple Test of the Concurrent Validity of the Social Interest Index

To assess the concurrent validity of the Social Interest Index (SII), we examined the relationships between subjects' social interest scores and their number and frequency of social contacts. As hypothesized, subjects' SII scores were related in a positive, significant manner to their reported number of close friends, number of relatives they felt close to, and number of monthly friend/relative contacts (all ps < .01). The results, which showed a positive relationship between social interest and social contacts, support the concurrent validity of the SII.     

The Assessment of Alexithymia in Medical Settings: Implications for Understanding and Treating Health Problems

The construct of alexithymia encompasses the characteristics of difficulty identifying feelings, difficulty describing feelings, externally oriented thinking, and a limited imaginal capacity. These characteristics are thought to reflect deficits in the cognitive processing and regulation of emotions and to contribute to the onset or maintenance of several medical and psychiatric disorders. In this article, we review recent methods for assessing alexithymia and examine how assessing alexithymia can inform clinical practice. Alexithymia is associated with heightened physiological arousal, the tendency to notice and report physical symptoms, and unhealthy compulsive behaviors. Alexithymic patients may respond poorly to psychological treatments, although perhaps not to cognitive-behavioral techniques, and it is unclear whether alexithymia can be improved through treatment. Interpretive problems regarding alexithymia include its overlap with other traits, whether it is secondary to illness or trauma, the possibility of subtypes, and low correlations among multiple measures. Nonetheless, we encourage the assessment of alexithymia in applied settings.     

MAPI Code Types in an Inpatient Crisis-Unit Sample

Limited data is available concerning the use of the Millon Adolescent Personality Inventory (MAPI; Millon, Green, & Meagher, 1982) and high-point code combinations of its personality style scales. Our study reports on the frequency of high-point codes in an inpatient crisis-unit sample. Data analyses comparing personality style codes using MAPI expressed concerns scale elevations and Rorschach data are reported. Results comparing the personality style codes and expressed concerns scales were consistent with the findings of Millon et al. (1982). Analyses comparing Rorschach and MAPI data revealed only the presence or absence of vista responses as having any appreciable relationship to MAPI codes or personality scales.     

Organizational Commitment,Job Satisfaction,and Effort in the Service Environment

Investigations of the causal relationship between organizational commitment and job satisfaction have yielded contradictory findings. Little empirical research has looked at this complex relationship in the context of work effort. The purpose of this study was to determine how these variables interact in the service environment. Using a sample of 425 employees in two service organizations, the author tested two structural equation models. The hypothesized model with organizational commitment as a moderator between job satisfaction and service effort fit better than a model with job satisfaction as moderator did. Conceptual implications are discussed, and suggestions for future research are made.     

Influence of Rhythmic Sensory Stimuli Upon the Heart-Rate

Eighteen retarded adults, divided into three groups equated for IQ, MA, and number conservation performance, received addition-subtraction and reversibility training under either cognitive-conflict or nonconflict conditions, or received no training. Under cognitive-conflict, transformation of one of two sets of discrete elements produced a perceptual illusion, and the addition-subtraction and reversibility operations applied to that set produced conflict between its length and density. Under nonconflict, simultaneous application of the operations to both sets avoided such conflict. Both training groups made significant gains from pretest and significantly exceeded controls in posttest number conservation (ps < .05). Lack of differential gains by the training groups suggested that cognitive conflict is not essential to induce number conservation.