Similarity-scaling studies of dot-pattern classification and recognition.

Classification performance in the dot-pattern, prototype-distortion paradigm (e.g., Posner & Keele, 1968) was modeled within a multidimensional scaling (MDS) framework. MDS solutions were derived for sets of dot patterns that were generated from prototypes. These MDS solutions were then used in conjunction with exemplar, prototype, and combined models to predict classification and recognition performance. Across 3 experiments, an MDS-based exemplar model accounted for the effects of several fundamental learning variables, including level of distortion of the patterns, category size, delay of transfer phase, and item frequency. Most important, the model quantitatively predicted classification probabilities for individual dot patterns in the sets, not simply general trends of performance. There was little evidence for the existence of a prototype-abstraction process that operated above and beyond pure exemplar-based generalization.     

Enhanced Hippocampal CA1 LTP but Normal Spatial Learning in Inositol 1,4,5-trisphosphate 3-kinase(A)-Deficient Mice

To define the physiological role of IP₃3-kinase(A) in vivo, we have generated a mouse strain with a null mutation of the IP₃3-kinase(A) locus by gene targeting. Homozygous mutant mice were fully viable, fertile, apparently normal, and did not show any morphological anomaly in brain sections. In the mutant brain, the IP₄ level was significantly decreased whereas the IP₃ level did not change, demonstrating a major role of IP₃3-kinase(A) in the generation of IP₄. Nevertheless, no significant difference was detected in the hippocampal neuronal cells of the wild-type and the mutant mice in the kinetics of Ca²⁺ regulation after glutamate stimulation. Electrophysiological analyses carried out in hippocampal slices showed that the mutation significantly enhanced the LTP in the hippocampal CA1 region, but had no effect on the LTP in dentate gyrus (DG). No difference was noted, however, between the mutant and the wild-type mice in the Morris water maze task. Our results indicate that IP₃3-kinase(A) may play an important role in the regulation of LTP in hippocampal CA1 region through the generation of IP₄, but the enhanced LTP in the hippocampal CA1 does not affect spatial learning and memory.     

When do job-insecure employees keep performing well? The buffering roles of help and prosocial motivation in the relationship between job insecurity,work engagement,and job performance

Journal of Business and Psychology - Drawing on the job demands-resources model, this study aims to explore the boundary conditions that buffer the negative effect of job insecurity on work...     

Effects of role model exposure on STEM and non‐STEM student engagement

Studies examining factors (e.g., STEM stereotypes) that underlie the recruitment and retention of STEM students are critical as the demand for STEM professionals is rapidly increasing. This experimental study tested the effects of role model biographies that challenge common STEM stereotypes (i.e., STEM is for gifted individuals and for European American males) on 1035 STEM and non‐STEM undergraduate students. Findings showed that role model exposure had positive effects on both STEM and non‐STEM students’ interest in STEM as well as their perceived identity compatibility between the self and STEM. Role model exposure had a positive impact on academic sense of belonging among STEM and non‐STEM students, and a positive impact on academic self‐efficacy among STEM students, but not non‐STEM students.     

Why people harm the organization and its members: Relationships among personality,organizational commitment,and workplace deviance

Based on the five-factor model of personality traits and social exchange theory, this study examines the relationships of personality traits, organizational commitment, and two target-based factors of workplace deviance (organizational deviance and interpersonal deviance), using a sample of 113 South Korean employees. By the use of path-analysis, we first found that Agreeableness, Conscientiousness, and Emotional Stability were meaningfully related to organizational commitment. In addition, both the effect of Conscientiousness on organizational deviance and the effect of Agreeableness on interpersonal deviance were partially mediated by organizational commitment. In sum, results clearly show that the personality traits of Conscientiousness (impersonal) and Agreeableness (interpersonal) function differently in predicting workplace deviance.     

A virtual reality assessment and training system for unilateral neglect.

Patients with unilateral neglect have problems reporting, responding, or orienting to novel or meaningful stimuli that is presented to the side opposite to that of a brain lesion. This creates a serous problem in regards to daily living activities. However, the established methods for assessing and training of unilateral neglect patients have several deficits. Recently, virtual reality (VR) technologies have been used as an assessment and treatment tool for rehabilitation. Hence, this study designed a VR system to assess and train unilateral neglect patients. In addition, the suitability and feasibility of our VR system for unilateral neglect patients was verified.     

Neurofeedback training with virtual reality for inattention and impulsiveness.

In this research, the effectiveness of neurofeedback, along with virtual reality (VR), in reducing the level of inattention and impulsiveness was investigated. Twenty-eight male participants, aged 14-18, with social problems, took part in this study. They were separated into three groups: a control group, a VR group, and a non-VR group. The VR and non-VR groups underwent eight sessions of neurofeedback training over 2 weeks, while the control group just waited during the same period. The VR group used a head-mounted display (HMD) and a head tracker, which let them look around the virtual world. Conversely, the non-VR group used only a computer monitor with a fixed viewpoint. All participants performed a continuous performance task (CPT) before and after the complete training session. The results showed that both the VR and non-VR groups achieved better scores in the CPT after the training session, while the control group showed no significant difference. Compared with the other groups, the VR group presented a tendency to get better results, suggesting that immersive VR is applicable to neurofeedback for the rehabilitation of inattention and impulsiveness.     

Contribution of self‐compassion to positive mental health among Korean university students

Although evidence suggests self‐compassion can serve as an important predictor of positive mental health, few studies have examined the contribution of self‐compassion to mental health. This study examined the relations between six components of self‐compassion and three dimensions of positive mental health (Psychological, Emotional and Social Well‐being) in young Korean adults. A sample of 689 Korean college students were administered the Self‐Compassion Scale (SCS) and the Mental Health Continuum Short Form (MHC‐SF) to evaluate self‐compassion and positive mental health. A multiple indicators multiple causes (MIMIC) analysis revealed that Self‐Kindness significantly predicted all dimensions of positive mental health. Additionally, Over‐Identification significantly contributed to Emotional Well‐being, Common Humanity to Social Well‐being and Isolation to Psychological Well‐being. These results suggest Self‐Kindness is a key predictor of positive mental health and that specific components of self‐compassion are strongly related to specific dimensions of mental health in Koreans.     

Positive Group Affective Tone and Team Creative Performance and Change‐Oriented Organizational Citizenship Behavior: A Moderated Mediation Model

Despite the vast amount of research on creativity and organizational citizenship behavior (OCB), little knowledge has been accumulated with respect to underlying mechanisms and boundary conditions affecting team creative performance and change OCB. To fill this research gap, this study aims at proposing and testing a moderated mediation model that delineates the relationships among positive group affective tone (PGAT), team reflexivity, team leader transformational leadership, team creative performance, and team change OCB. As hypothesized, PGAT was positively associated with team reflexivity, which in turn significantly predicted team creative performance and change OCB. In addition, the relationship between PGAT and team reflexivity and the indirect effects of PGAT on team creative performance and change OCB through team reflexivity were more pronounced when team leader transformational leadership was high than when it was low. These findings were validated in a post hoc analysis that compared the proposed moderated mediation model with alternative models.     

Safe driving communication: A regulatory focus perspective

This research article examines the effects of self‐regulation on adolescents' aggressive driving tendencies and their attitudes toward safe driving communication. Two experimental studies demonstrate that an individual's regulatory orientation is a good predictor of aggressive driving tendencies and that self‐regulation plays a moderating role on the effects of safe driving messages on recipients' attitudes. Specifically, the findings reveal that promotion‐oriented (vs. prevention‐oriented) individuals are more likely to demonstrate aggressive driving tendencies. In addition, promotion‐oriented individuals show more favorable attitudes toward gain‐framed safe driving messages than loss‐framed messages. Prevention‐oriented individuals show the opposite pattern. Implications for theory and practice are discussed.