Perception of individuality in bat vocal communication: discrimination between, or recognition of, interaction partners?

Different cognitive processes underlying voice identity perception in humans may have precursors in mammals. A perception of vocal signatures may govern individualised interactions in bats, which comprise species living in complex social structures and are nocturnal, fast-moving mammals. This paper investigates to what extent bats recognise, and discriminate between, individual voices and discusses acoustic features relevant for accomplishing these tasks. In spontaneous presentation and habituation–dishabituation experiments, we investigated how Megaderma lyra perceives and evaluates stimuli consisting of contact call series with individual-specific signatures from either social partners or unknown individuals. Spontaneous presentations of contact call stimuli from social partners or unknown individuals elicited strong, but comparable reactions. In the habituation–dishabituation experiments, bats dishabituated significantly to any new stimulus. However, reactions were less pronounced to a novel stimulus from the bat used for habituation than to stimuli from other bats, irrespective of familiarity, which provides evidence for identity discrimination. A model separately assessing the dissimilarity of stimuli in syllable frequencies, syllable durations and inter-call intervals relative to learned memory templates accounted for the behaviour of the bats. With respect to identity recognition, the spontaneous presentation experiments were not conclusive. However, the habituation–dishabituation experiments suggested that the bats recognised voices of social partners as the reaction to a re-habituation stimulus differed after a dishabituation stimulus from a social partner and an unknown bat.     

When multiple identities compete: The role of centrality in self‐brand connections

The current research provides a framework for understanding how centrality impacts people's choice of brands and related brand connectedness. Motivated by the need to validate their self‐image, individuals use brands to express and confirm their identities. The authors hypothesize that greater centrality of the identity to the self strengthens the connectedness an individual has for brands with value‐expressive properties. Three studies using experimental designs examined whether people whose identity is central to their self‐conception leads to stronger self‐brand connectedness than peripheral identities. In study 1, the results showed that people whose shopping identity was central (versus peripheral) to their self‐concept led to stronger self‐brand connections. Study 2 replicated the findings of study 1 employing brand symbolism as a moderator. Brands high in symbolic properties led to stronger brand connections for an individual's central identities compared with their peripheral identities. Study 3 replicated the influence of centrality on brand choice and self‐brand connections by generalizing this effect to reference group identities. Collectively, the studies provide evidence that individuals integrate brand associations into their self‐concept on the basis of both the centrality of the identity and the level of symbolism the brands holds for an identity. Copyright © 2013 John Wiley & Sons, Ltd.     

Attainment of an exceptionally high strength in low-carbon steel along with modest ductility through a novel heat treatment route

ABSTRACT

Over the last few decades, the use of steel (the most significant structural engineering material) is facing a significant challenge due to its replacement by other materials (such as composites) possessing higher strength-to-weight ratio/specific strength. This necessitates further enhancement in the strength of steel. In particular, low-carbon steel, in the annealed condition, suffers from inherent problems of poor strength and discontinuous yielding. In this research work a novel heat treatment route of incomplete austenitisation-based cyclic ice-brine quenching has been adopted on low-carbon steel (AISI 1010 steel containing 0.1 wt.% C) without considering any costly alloying or thermo-mechanical treatment. Accordingly, exceptionally high strength (UTS?=?1.7?GPa) and specific strength (226?MPa?g^?1cm³) are achieved after three cycles along with a modest ductility (% Elongation?=?9). This is the highest strength reported so far for low-carbon steel containing 0.1 wt.% C. Yield point phenomenon is also eliminated. This is attributed to a novel microstructure consisting of highly sub-structured fine plate martensite crystals containing internal twin and dislocation tangles along with dispersion of nano-sized cementite particles and clusters of cementite particles.     

The Effects of Personal Agency on Regret

In this paper, we examine the role of personal agency as a key antecedent of regret that individuals experience when the outcome of their decision is unfavorable. In contrast to previous research that documents its exacerbating role, we find that personal agency mitigates regret under certain circumstances. A series of experimental studies show that personal responsibility for the decision may attenuate subjective perceptions of the extent of failure and mitigate regret. However, when the superior outcome of the foregone option is known and the failure of the chosen option is irreversible, personal agency may amplify regret. We also find that subjective failure perceptions mediate the relationship between personal agency and regret levels. Copyright © 2012 John Wiley & Sons, Ltd.     

Psychophysiological Reactions to the Response Phase of the Rorschach and 16PF

Sylvia Anthony. The Discovery of Death in Childhood and After. New York: Basic Books, 1972, $6.95. Reviewed by Louise Bates Ames

B. Klopfer, M. M. Meyer, and F. B. Brawer (Editors), Developments in the Rorschach Technique, Vol. III. New York: Harcourt Brace Jovarovich, 1970 Reviewed by A. I. Rabin

Mireille Monod, Manuel d'Application de Test du Village. (Manual for the village test). Neuchatel (Switzerland): Delachaux &; Niestle, 1970. Reviewed by S. G. Vandenberg

Florence Roswell and Gladys Natchez. Reading Disability: Diagnosis and Treatment. (2nd ed.) New York: Basic Books, 1971, 277 pages, $6.95. Reviewed by Jules C. Abrams, PhD

M. Gardiner (Ed.) The Wolf-Man by the Wolf-Man. New York: Basic Books, 1971, 370 pages, $10.00. Reviewed by Benjamin Beit-Hallahmi

N. J. Hale, Jr. Freud and The Americans – The Beginnings of Psychoanalysis in the United States, 1876–1917. New York: Oxford, 1971, 574 pages, $15.00. Reviewed by Benjamin Beit-Hallahmi     

Karl Popper,Psychology and Philosophy

This paper intends to re-emphasize the relationship among Psychology, Popper and his Philosophy. Popper, who is often considered as one of the most important philosophers of science, had associations with the discipline of psychology in his early years. Popper was associated with Würzburg school of psychology, especially the psychologies of Külpe, Selz and Bühler. However, there was a change in Popper’s interest from the psychology of discovery to an objectivist epistemology—that is, to the logic of discovery, which he himself acknowledged (1976, p. 55). Popper, not only turned away from psychology, as early as 1930 or thereabouts, he later became one of the most outspoken opponents of a psychological approach to science. This antipathy has worked both ways! Very few psychologists study and discuss Popper. His place in the history of psychology, certainly remains inadequate. But why should psychologists ignore Popper? Instead of turning away from Popper, Psychologists’ efforts should be directed towards bringing into focus Popper, his works and association with psychology. This paper argues and tries to discuss the relationships among Popper, his training in psychology and his philosophy.     

Changes in achievement goals and competence perceptions across the college semester

We investigated the relationship between changes in perceptions of competence and changes in achievement goals across a college semester for students enrolled in an introductory psychology course. Two types of competence perceptions were examined: self-efficacy for learning and normative perceived ability. Changes in normative perceived ability were predicted to relate to changes in performance goals, but not mastery goals. Because mastery goals rely on self-referent standards to evaluate ability, we predicted changes in self-efficacy for learning would relate to changes in mastery goals. We also expected changes in self-efficacy for learning to relate to changes in performance goals because learning can lead to the demonstration of superior competence. The predictions were supported for mastery and performance-approach goals, but not for performance-avoidance goals. Very little change in performance-avoidance goals was observed. Scores on the first course exam also predicted change in performance-approach goals, with this effect partially mediated by competence perceptions.     

Structural stability of W2B5 under high pressure

High-pressure structural stability studies have been carried out on tungsten boride W₂B₅ up to maximum pressure of 36 GPa using a Mao-Bell diamond-anvil cell at beamline BR-12 of the ELETTRA synchrotron facility (λ = 0.68881 Å). The hexagonal phase (S.G:P6₃/mmc) of W₂B₅ is stable up to the maximum pressure studied. The bulk modulus is estimated to be ~347 GPa using the Birch–Murnaghan equation of state. The variation of lattice parameters and bond lengths B–B and W–B have been studied and the c-axis is seen to be marginally more compressible than the a-axis.