Learning to Minimize Energy Costs and Maximize Mechanical Work in a Bimanual Coordination Task

The authors addressed the hypothesis that economy in motor coordination is a learning phenomenon realized by both reduced energy cost for a given workload and more external work at the same prepractice metabolic and attentional energy expenditure. "Self-optimization" of movement parameters has been proposed to reflect learned motor adaptations that minimize energy costs. Twelve men aged 22.3 ± 3.9 years practiced a 90° relative phase, upper limb, independent ergometer cycling task at 60 rpm, followed by a transfer test of unpracticed (45 and 75 rpm) and selfpaced cadences. Performance in all conditions was initially unstable, inaccurate, and relatively high in both metabolic and attentional energy costs. With practice, coordinative stability increased, more work was performed for the same metabolic and attentional costs, and the same work was done at a reduced energy cost. Selfpaced cycling was initially below the metabolically optimal, but following practice at 60 rpm was closer to optimal cadence. Given the many behavioral options of the motor system in meeting a variety of everyday movement task goals, optimal metabolic and attentional energy criteria may provide a solution to the problem of selecting the most adaptive coordination and control parameters.     

Energy,Complexity, and Strategies of Evolution: As Illustrated by Maya Indians of Guatemala

Using free energy rate density (Φ_m) I differentiate two evolutionary strategies common to cosmic, biological, and cultural systems: the horizontal when energy increases proportional to mass, with no increase in complexity; and the vertical when it increases disproportionately to the mass and complexity increases. The vertical process is a continuing increase in complexity such that the system becomes vulnerable to collapse when energy sources fail. This is illustrated by a comparison of four Mayan Indian groups in Guatemala.     

The Psychophysiology Of Intuition: A Quantum-Holographic Theory Of Nonlocal Communication

This work seeks to explain intuitive perception—those perceptions that are not based on reason or logic or on memories or extrapolations from the past, but are based, instead, on accurate foreknowledge of the future. Often such intuitive foreknowledge involves perception of implicit information about nonlocal objects and/or events by the body's psychophysiological systems. Recent experiments have shown that intuitive perception of a future event is related to the degree of emotional significance of that event, and a new study shows that both the brain and the heart are involved in processing a pre-stimulus emotional response to the future event. Drawing on this research and on the principles of quantum holography, I develop a theory of intuition that views the perception of things remote in space or ahead in time (nonlocal communication) as involving processes of energetic resonance connecting the body's psychophysiological systems to the quantum level. The theory explains how focused emotional attention directed to the nonlocal object of interest attunes the bio-emotional energy generated by the body's psychophysiological systems to a domain of quantum-holographical information, which contains implicit information about the object. The body's perception of such implicit information about things distant in space/time is experienced as an intuition.     

Christer Sjödin interviews Jan Stensson

Abstract

The author examines different definitions and applications of the terms “psychic energy” and “libido.” With regard to the “psychic energy” terminology, he shows that its application and usage relate in particular to the perspective of Brenner and not to Freud's definition. He argues that Freud uses the term “psychic energy” as a synonym for “libido,” and not “libido” as a synonym for “psychic energy.” It is demonstrated that in Freud's view, up until 1914, “libido” relates to manifestations of bodily sexual tensions, and subsequently this term applies to the manifestations of sexual energy in the psychic field. The author rejects this change in terminology and also challenges Freud's attempt to use dynamic-economic considerations as an explanatory device for epistemological reasons. Freud's concept of energy is inconsistent with the meaning of energy as defined in the physical sciences, and whereas the metapsychological topographical, dynamic, and structural viewpoints have a solid foundation in the representational world to which the psychoanalytic process affords unique access, this is not true of the economic viewpoint. It is claimed that bodily tensions only exist in the representational world in the form of affects, so that, in the author's opinion, the economic viewpoint should be abandoned in favour of an affective one. In the context of the endeavour to obtain pleasure and avoid unpleasure adduced by Freud, this viewpoint focuses on the relationships between affects and the different elements of the representational world, thereby serving as the subject of metapsychological investigation.     

Temperature-dependent crack surface tension

The fracture surface energy is calculated for a one-dimensional, exactly solvable model of a crack. The temperature dependence of the crack surface tension is determined on the basis of a self-consistent Einstein approach. It is found that lattice vibrations result in a strong reduction in the crack surface tension.     

Supersonic crack motion in a harmonic lattice

Antiplane shear cracks in a harmonic square lattice have been studied in a molecular dynamics simulation. They can reach velocities larger than the shear wave velocity.     

High-temperature creep associated with the climb of extended dislocations subjected to chemical stresses

The effect of chemical stresses upon the relation between extended dislocations and high-temperature creep in a thin plate has been investigated. The critical stress needed for the contraction of extended jogs and its effect on the creep rate are obtained. The results indicate that the critical stress needed for the contraction increases with decreasing stacking fault energy (SFE). However, creep occurs more easily with increasing SFE and increasing angle of the Burgers vector to the dislocation line, as well as with the concentration of any diffusing atoms.     

Rethinking ‘Don't Blame the Victim’

SUMMARY

The psychology of victims and the dynamics of victimhood have been largely ignored by scholars and clinicians. While in past years the tendency has been to blame victims, more recently the tide has turned. It is now politically incorrect to explore the role of victims in violent systems, as exploring the psychology of victims has become synonymous with blaming the victim. While shying away from blame, this article will explore the familial and cultural origins of victimhood, victims' characteristics, their relationships with the perpetrators, and it will offer a victim typology. As we move from btame to a more complex understanding of violent systems, the perpetuation of these systems in our culture, and the role victims play in these systems, we provide ourselves with better tools to predict and prevent further victimization.     

Work engagement and voluntary absence: The moderating role of job resources

The present study examined the moderating role of job resources, namely, organizational trust, the quality of employees’ relationship with their manager, and the motivating potential of jobs, on the negative relationship between work engagement and voluntary absence. Employee survey results and absence records collected from the Human Resources department of a construction and consultancy organization in the United Kingdom (n = 325) showed that work engagement was negatively related to voluntary absence, as measured by the Bradford Factor. Furthermore, the results showed that organizational trust and the quality of employees’ relationships with their line managers ameliorated the negative effect of relatively low levels of engagement on voluntary absence. Theoretical and practical implications of the findings are discussed.