The Cascade Neural Network Model and a Speed-Accuracy Trade-Off of Arm Movement

We propose a hybrid neural network model of aimed arm movements that consists of a feedforward controller and a postural controller. The cascade neural network of Kawato, Maeda, Uno, and Suzuki (1990) was employed as a computational implementation of the feedforward controller. This network computes feedforward motor commands based on a minimum torque-change criterion. If the weighting parameter of the smoothness criterion is fixed and the number of relaxation iterations is rather small, the cascade model cannot calculate the exact torque, and the hand does not reach the desired target by using the feedforward control alone. Thus, one observes an error between the final position and the desired target location. By using a fixed weighting parameter value and a limited iteration number to simulate target-directed arm movements, we found that the cascade model generated a planning time–accuracy trade-off, and a quasi–power-law type of speed–accuracy trade-off. The model provides a candidate neural mechanism to explain the stochastic variability of the time course of the feedforward motor command. Our approach also accounts for several invariant features of multijoint arm trajectories, such as roughly straight hand paths and bell-shaped speed profiles.     

Thick Ethical Concepts in the Philosophy and Literature of Iris Murdoch

Although thick ethical concepts have been neglected in Murdochian scholarship, this article argues that they were central to the thought of Iris Murdoch. In the first section, the article provides a sustained account of thick ethical concepts in Murdoch's philosophy, demonstrating how these concepts align with and illuminate familiar aspects of her philosophical essays. The first section also explores the ways in which Murdoch's alternative account of moral concepts was at the heart of her overall attack on the noncognitivism of her day. In the second section, the article provides a reading of The Black Prince and considers the ways that thick ethical concepts offer new insight into Murdoch's literary activity. It concludes by suggesting that studying Murdoch's philosophy and literature in light of thick ethical concepts reveals a deep unity between her two intellectual projects.     

Intrapersonal curiosity: Inquisitiveness about the inner self

Intrapersonal Curiosity (InC) involves inquisitively introspecting to better understand one’s inner self. A pool of 39 face-valid InC items was administered to 1005 participants, along with other curiosity, personality, self-awareness, self-regulation, and psychological well-being scales. Three InC factors with good model fit were identified, from which four-item (α ≥ .89) subscales were developed: “Understanding one’s Emotions and Motives,” “Reflecting On one’s Past,” and “Exploring one’s Identity and Purpose.” InC correlated positively with other measures of curiosity, evidencing convergence; weak correlations to conceptually unrelated constructs demonstrated divergence. Higher InC scores corresponded to perceptions of having less available self-knowledge, heightened sensitivity to others’ expressions, a greater tendency to privately introspect, increased distress, and more concern about how to best cope with worry over self-relevant threats.     

A RANDOMNESS‐BASED THEODICY FOR EVOLUTIONARY EVILS

We develop and knit together several theodicies in order to find a more complete picture of why certain forms of (nonhuman) animal suffering might be permitted by a perfect being. We focus on an especially potent form of the problem of evil, which arises from considering why a perfectly good, wise, and powerful God might use evolutionary mechanisms that predictably result in so much animal suffering and loss of life. There are many existing theodicies on the market, and although they offer helpful resources, we combine and further develop several proposals to produce a composite theodicy that avoids certain shortcomings of the individual theodicies. An important element of our project is locating a role for randomness in cosmic and biological evolution. In particular, we show how randomness might enhance or enable certain goods, including everlasting goods, at the risk of temporary evils.     

Striving for the moral self: the effects of recalling past moral actions on future moral behavior

People's desires to see themselves as moral actors can contribute to their striving for and achievement of a sense of self-completeness. The authors use self-completion theory to predict (and show) that recalling one's own (im)moral behavior leads to compensatory rather than consistent moral action as a way of completing the moral self. In three studies, people who recalled their immoral behavior reported greater participation in moral activities (Study 1), reported stronger prosocial intentions (Study 2), and showed less cheating (Study 3) than people who recalled their moral behavior. These compensatory effects were related to the moral magnitude of the recalled event, but they did not emerge when people recalled their own positive or negative nonmoral behavior (Study 2) or others' (im)moral behavior (Study 3). Thus, the authors extend self-completion theory to the moral domain and use it to integrate the research on moral cleansing (remunerative moral strivings) and moral licensing (relaxed moral strivings).     

The association between temperament and depressive symptoms in adolescence: brooding and reflection as potential mediators

This study examined whether rumination subtypes (brooding and reflection) mediated prospective associations between temperament (negative emotionality and positive emotionality) and depressive symptoms in a community sample of 423 adolescents. Effortful control and sex were examined as potential moderators of the mediated pathway. Youth self-reported negative emotionality (NE), positive emotionality (PE), and effortful control (EC) at age 12; brooding and reflection subtypes of rumination at age 14; and depressive symptoms at ages 12, 14, and 15. Hierarchical linear regression analyses indicated that, controlling for initial levels of depressive symptoms, high NE, but not low PE, predicted increases in depressive symptoms from age 12 to age 15. Brooding, but not reflection, mediated the association between NE and depressive symptoms. Neither sex nor EC moderated either indirect pathway in the mediated model. The results confirm and extend previous findings on the association between affective and cognitive vulnerability factors in predicting depressive symptoms in adolescence.     

Six-month-old infants perceive the hollow-face illusion

In this study we investigated infants' perception of the hollow-face illusion. 6-month-old infants were shown a concave mask under monocular and binocular viewing conditions and the direction of their reaches toward the mask was recorded. Adults typically perceive a concave mask as convex under monocular conditions but as concave under binocular conditions, depending on viewing distance. Based on previous findings that infants reach preferentially toward the parts of a display that are closest to them, we expected that, if infants perceive the hollow-face illusion as adults do, they would reach to the center of the mask when viewing it monocularly and to the edges when viewing it binocularly. The results were consistent with these predictions. Our findings indicated that the infants perceived the mask as convex when viewing it with one eye and concave when viewing it with two eyes. The results show that 6-month-old infants respond to the hollow-face illusion. Our finding suggests that, early in life, the visual system uses the constraint, or assumption, that faces are convex when interpreting visual input.