Event-related fMRI of category learning: differences in classification and feedback networks

Eighteen healthy young adults underwent event-related (ER) functional magnetic resonance imaging (fMRI) of the brain while performing a visual category learning task. The specific category learning task required subjects to extract the rules that guide classification of quasi-random patterns of dots into categories. Following each classification choice, visual feedback was presented. The average hemodynamic response was calculated across the eighteen subjects to identify the separate networks associated with both classification and feedback. Random-effects analyses identified the different networks implicated during the classification and feedback phases of each trial. The regions included prefrontal cortex, frontal eye fields, supplementary motor and eye fields, thalamus, caudate, superior and inferior parietal lobules, and areas within visual cortex. The differences between classification and feedback were identified as (i) overall higher volumes and signal intensities during classification as compared to feedback, (ii) involvement of the thalamus and superior parietal regions during the classification phase of each trial, and (iii) differential involvement of the caudate head during feedback. The effects of learning were then evaluated for both classification and feedback. Early in learning, subjects showed increased activation in the hippocampal regions during classification and activation in the heads of the caudate nuclei during the corresponding feedback phases. The findings suggest that early stages of prototype-distortion learning are characterized by networks previously associated with strategies of explicit memory and hypothesis testing. However as learning progresses the networks change. This finding suggests that the cognitive strategies also change during prototype-distortion learning.     

Perceived motion in structure from motion: Pointing responses to the axis of rotation

We investigated the ability to match finger orientation to the direction of the axis of rotation in structure-from-motion displays. Preliminary experiments verified that subjects could accurately use the index finger to report direction. The remainder of the experiments studied the perception of the axis of rotation from full rotations of a group of discrete points, the profiles of a rotating ellipsoid, and two views of a group of discrete points. Subjects’ responses were analyzed by decomposing the pointing responses into their slant and tilt components. Overall, the results indicated that subjects were sensitive to both slant and tilt. However, when the axis of rotation was near the viewing direction, subjects had difficulty reporting tilt with profiles and two views and showed a large bias in their slant judgments with two views and full rotations. These results are not entirely consistent with theoretical predictions. The results, particularly for two views, suggest that additional constraints are used by humans in the recovery of structure from motion.     

Is the psychological refractory period effect for ideomotor compatible tasks eliminated by speed-stress instructions?

It has been argued that the psychological refractory period (PRP) effect is eliminated with two ideomotor compatible tasks when instructions stress fast and simultaneous responding. Three experiments were conducted to test this hypothesis. In all experiments, Task 1 required spatially compatible manual responses (left or right) to the direction of an arrow, and Task 2 required saying the name of the auditory letter A or B. In Experiments 1 and 3, the manual responses were keypresses made with the left and right hands, whereas in Experiment 2 they were left-right toggle-switch movements made with the dominant hand. Instructions that stressed response speed reduced reaction time and increased error rate compared to standard instructions to respond fast and accurately, but did not eliminate the PRP effect on Task 2 reaction time. These results imply that, even when response speed is emphasized, ideomotor compatible tasks do not bypass response selection.     

Facial perception of conspecifics: chimpanzees (Pan troglodytes) preferentially attend to proper orientation and open eyes

This paper reports on the use of an eye-tracking technique to examine how chimpanzees look at facial photographs of conspecifics. Six chimpanzees viewed a sequence of pictures presented on a monitor while their eye movements were measured by an eye tracker. The pictures presented conspecific faces with open or closed eyes in an upright or inverted orientation in a frame. The results demonstrated that chimpanzees looked at the eyes, nose, and mouth more frequently than would be expected on the basis of random scanning of faces. More specifically, they looked at the eyes longer than they looked at the nose and mouth when photographs of upright faces with open eyes were presented, suggesting that particular attention to the eyes represents a spontaneous face-scanning strategy shared among monkeys, apes, and humans. In contrast to the results obtained for upright faces with open eyes, the viewing times for the eyes, nose, and mouth of inverted faces with open eyes did not differ from one another. The viewing times for the eyes, nose, and mouth of faces with closed eyes did not differ when faces with closed eyes were presented in either an upright or inverted orientation. These results suggest the possibility that open eyes play an important role in the configural processing of faces and that chimpanzees perceive and process open and closed eyes differently.     

Korean Pastors and Their Wives’ Marital Satisfaction and Its Predicting Factors

This study examined to what extent Korean pastors and their wives in America were satisfied with their marital lives. It also investigated how selected factors predicted marital satisfaction among Korean pastors and their wives: communication, expression of affection, empathy, sexual satisfaction, and doing things together. Eighty-five pastors and 79 pastors’ wives (n = 164) participated in this study, and they were separately measured. The Kansas Marital Satisfaction Scale (KMSS) and Lee’s Marital Inventory (LMI) were utilized. The results found that the participants showed a high level of marital satisfaction. For Korean pastors, expression of affection and doing things together were significant predictors for marital satisfaction while only expression of affection was the significant predictor for the marital satisfaction of pastors’ wives.     

A longitudinal examination of the relationship between teacher burnout and depression

This study investigates the longitudinal relationships between burnout and depression among teachers. Middle and high school teachers participated in a 3‐wave survey. The results of the latent growth modeling analysis revealed that there was a significant relationship between the initial status of burnout and the initial status of depression. Results also indicated a significant relationship between the change rate of burnout and the change rate of depression. Moreover, the autoregressive cross‐lagged modeling revealed a causal relationship such that teacher's burnout leads to subsequent depression symptoms, not vice versa.     

In the Presence of Love: The Pneumatological Realization of the Economy: Yves Congar's Le Mystère du Temple

Abstract:   Yves Congar's The Mystery of the Temple develops many of the themes that will be more fully worked out in his later pneumatology, particularly I Believe in the Holy Spirit . Considered against its context, Congar's pneumatology can be seen to be central to his particular strategy of ressourcement. In particular, Congar deploys pneumatology to preserve the theological connection between Christology and ecclesiology, and so offers a version of 'Spirit Christology' which avoids the pitfalls usually associated with such a position. This use of pneumatology in Congar's vision can be traced back to his account of the particular hypostasis of the Spirit in the immanent Trinity.     

Reflection Toward Creativity: Team Reflexivity as a Linking Mechanism Between Team Goal Orientation and Team Creative Performance

Purpose

This study aims at testing the mediating role of team reflexivity in the relationships between team learning, performance-prove, and performance-avoid goal orientations and team creative performance and assessing the relative importance of the three types of team goal orientation in team reflexivity and creative performance.

Methodology

We conducted Study 1 on 68 student teams by using a two-wave time-lagged design. In Study 2, we carried out a cross-sectional field study on 108 intact work teams in diverse Korean companies.

Findings

Team learning goal orientation was significantly associated with team creative performance. While team learning and performance-prove goal orientations were equally influential in predicting team reflexivity, team performance-avoid goal orientation had no relationship with team reflexivity and creative performance. Team reflexivity mediated the relationships between team learning and performance-prove goal orientations and team creative performance.

Implications

By revealing that team learning and performance-prove goal orientations can contribute to team creative performance through the facilitation of team reflective process, this study provides practitioners with insight into critical antecedents and team process that are conducive to the creative performance of work teams.

Originality/Value

This is one of the first studies to explore a mediating mechanism between team goal orientation and creative performance. This study attends to the role of team reflexivity as a key team-regulatory process that underlies the relationship between team goal orientation and team performance. Furthermore, the use of multiple studies in different contexts strengthens the robustness of the study findings.

     

Different step-over movement strategies for disturbance stimulations

This study examined differences in performance when 10 healthy adult participants took steps under three different disturbance stimulations (with opened and closed eyes and with the use of light), with and without an obstacle present. In the voluntary condition, participants recognized the obstacle beforehand and stepped over it quickly; in the light condition, participants recognized the obstacle beforehand and quickly stepped over it after light stimulation; in the closed eyes condition, participants did not recognize the obstacle beforehand, but after opening their eyes when hearing a sound, they quickly stepped over the obstacle. The swing time of the gait was significantly longer in obstacle conditions for all stimulations. The swing time was significantly longer under the closed eyes condition than the light and voluntary conditions. The clearances were significantly higher in order of the closed eyes, light, and voluntary conditions in the presence of an obstacle.