On the space-time structure of human interlimb co-ordination

In three experiments we show, using behavioural measures of movement outcome, as well as movement trajectory information and resultant kinematic profiles, that there is a strong tendency for the limbs to be co-ordinated as a unitary structure even under conditions where the movements are of disparate difficulty. Environmental constraints (an obstacle placed in the path of one limb, but not in the other) are shown to modulate the space-time behaviour of both limbs (Experiment II). Our results obtain for symmetrical (Experiment I) as well as asymmetrical movements that involve non-homologous muscle groups (Experiment III). These findings suggest that in multi-joint limb movements, the many degrees of freedom are organised to function temporarily as a single coherent unit that is uniquely specific to the task demands placed on it. For movements in general, and two-handed movements in particular, such units are revealed in a partitioning of the relevant force demands for each component (a force scaling characteristic) and a preservation of the internal “topology” of the action, as indexed by the relative timing among components. These features, as well as systematic deviations from perfect synchrony between the limbs can be rationalised by a model that assumes the limbs behave qualitatively like non-linear oscillators.     

PERCEPTIONS OF POWER Female Executives' Descriptions of Power Usage by "Best" and "Worst" Bosses

This research examined the perceived use of power by women executive's best and worst bosses. Using a new methodology to measure French and Raven's (1959) and Raven's (1965) power bases, members of the National Association of Female Executives responded to a survey in which they evaluated the power bases of their best and worst bosses. Male bosses were more likely than female bosses to be identified as the worst boss, whereas females and males were equally likely to be identified as the best boss, although these women probably had far more male than female bosses.     

Reflections on "Nursing considered as moral practice

This response to the preceding article by Gastmans, Dierckx de Casterle, and Schotsmans challenges the notion of "good care" as the ultimate goal of nursing practice, explores further the possible goals of nursing and how they may be identified, and presents six elements of professional caring along with their related virtues and moral obligations.     

Stressful Life Events: A Revision and Update of the Social Readjustment Rating Scale

The widely used and cited Social Readjustment Rating Scale developed by Holmes and Rahe (1967) was comprehensively revised and updated. The new instrument, containing 51 major life events, was administered to a national sample of 5000. Respondents were asked to rate the stressfulness of each life event on a 1–100 scale. Completed surveys were returned by 3122 individuals (62.4%). Responses were analyzed using repeated measures MANOVA and profile analysis. Major results included: (a) statistically and practically significant differences in mean ratings for the 51 life events; (b) five overlapping themes in the top 20 rated life events—death and dying, healthcare, crime and the criminal justice system, financial/economic issues, and family-related issues; and (c) an amazing level of agreement concerning perceived life event stressfulness, regardless of gender, age, or income level.     

Spatial and physical frames of reference in positioning a limb

Splints attached to the right forearm were used to rotate the forearm’s physical reference frame, as defined by the eigenvectors of its inertia tensor, relative to its spatial reference frame. In two experiments, when subjects were required to orient the forearm parallel to, or at 45° to, the environmental horizontal, they produced limb orientations that were systematically deflected from the forearm’s longitudinal spatial axis in the direction of the forearm’s physical axes. The position sense seems to be based on inertial eigenvectors rather than on joint angles or gravitational torques.     

An Evaluation of the Cross-Cultural Validity of Holland's Theory: Career Choices by Workers in India

The current study evaluated the cross-cultural validity of Holland's (1985) theory through internal and external analyses based on the responses of 172 natives of India who completed the Vocational Preference Inventory (VPI) and measures of job and occupational satisfaction. Internal consistency estimates for Holland dimensions, intercorrelations among participants' vocational interest scales, and the results of a randomization test (Tracey, 1997) all provide evidence for the internal structure of the VPI with Indians. However, the VPI did not exhibit high external validity. Further, multiple regression results indicated that congruence, consistency, and differentiation did not predict job or occupational satisfaction, suggesting cross-cultural boundaries on Holland's theory itself. Finally, we assessed and found limited conceptual and linguistic equivalence of measurement of the VPI in India. The assumptions of Holland's theory in light of the current findings are discussed.