Similarity structure in visual speech perception and optical phonetic signals

A complete understanding of visual phonetic perception (lipreading) requires linking perceptual effects to physical stimulus properties. However, the talking face is a highly complex stimulus, affording innumerable possible physical measurements. In the search for isomorphism between stimulus properties and phoneticeffects, second-order isomorphism was examined between theperceptual similarities of video-recorded perceptually identified speech syllables and the physical similarities among the stimuli. Four talkers produced the stimulus syllables comprising 23 initial consonants followed by one of three vowels. Six normal-hearing participants identified the syllables in a visual-only condition. Perceptual stimulus dissimilarity was quantified using the Euclidean distances between stimuli in perceptual spaces obtained via multidimensional scaling. Physical stimulus dissimilarity was quantified using face points recorded in three dimensions by an optical motion capture system. The variance accounted for in the relationship between the perceptual and the physical dissimilarities was evaluated using both the raw dissimilarities and the weighted dissimilarities. With weighting and the full set of 3-D optical data, the variance accounted for ranged between 46% and 66% across talkers and between 49% and 64% across vowels. The robust second-order relationship between the sparse 3-D point representation of visible speech and the perceptual effects suggests that the 3-D point representation is a viable basis for controlled studies of first-order relationships between visual phonetic perception and physical stimulus attributes.     

Spatial reference frames and SNARC

In this work, the role that spatial reference frames play in determining the spatial-numerical association of response codes (SNARC) effect is examined. Participants were instructed to generate an image of the numbers 1–9 oriented spatially in either a horizontal, vertical, or proximo-distal manner. Responses to a magnitude comparison task were then provided manually using keys located either to the left and right or at the bottom and top of a computer keyboard. For conditions in which the orientation of the generated image and the response locations were orthogonally misaligned, SNARC effects were not evident. It is argued that such results imply that alignment of the spatial reference frames associated with the responses and with the representation of numerical magnitude is a necessary condition for the elicitation of the SNARC effect.     

Positive Youth Development Program for Mental Health Promotion in College Campuses: Stakeholder Perspectives

The present study aimed at exploring stakeholder perspectives on felt need, potential content, receptivity and feasibility of a positive youth development program for mental health promotion in college campuses. Study objectives were attained through semi-structured interviews with 20 college faculty/administrators and five focus group discussions with 64 students across 16 colleges in a metropolitan city in South India. The need and relevance of a program for mental health promotion were endorsed by all the participants, and it was considered feasible with prior planning. Suggestions for potential content of such a program included mental health awareness, dealing with depression and anxiety, managing negative emotions, managing pressures and temptations, improving self-confidence, reflection and clarity about life goals, cultivating sense of gratitude, broadening other orientation, and time management skills. The content of intervention perceived as important by the two groups of stakeholders highlighted the broad convergences between the potential themes being considered by the researchers and the stakeholder views. Potential receptivity to the program was considered to be good though it was perceived to be influenced by the awareness about the importance of such a program. Suboptimal interest of college authority and/or students and competing academics and other programs were identified as potential challenges to program implementation. The findings are discussed with respect to implications for program development as well as for further research.     

Awareness of Jordanian Investigators About the Importance of Ethics Review Committees: A Pilot Study

Science and Engineering Ethics - Protection of study participants is an integral function of the Institutional Review Board (IRB). Recently, great efforts were dedicated to enhance...     

The effects of clinical motor variables and medication dosage on working memory in Parkinson’s disease

In this study, we investigate the interrelationship between clinical variables and working memory (WM) in Parkinson’s disease (PD). Specifically, the aim of the study was to investigate the relationship between disease duration, dopaminergic medication dosage, and motor disability (UPDRS score) with WM in individuals with PD. Accordingly, we recruited three groups of subjects: unmedicated PD patients, medicated PD patients, and healthy controls. All subjects were tested on three WM tasks: short-delay WM, long-delay WM, and the n-back task. Further, PD encompasses a spectrum that can be classified either into akinesia/rigidity or resting tremor as the predominant motor presentation of the disease. In addition to studying medication effects, we tested WM performance in tremor-dominant and akinesia-dominant patients. We further correlated WM performance with disease duration and medication dosage. We found no difference between medicated and unmedicated patients in the short-delay WM task, but medicated patients outperformed unmedicated patients in the long-delay WM and n-back tasks. Interestingly, we also found that akinesia-dominant patients were more impaired than tremor-dominant patients at various WM measures, which is in agreement with prior studies of the relationship between akinesia symptom and basal ganglia dysfunction. Moreover, the results show that disease duration inversely correlates with more demanding WM tasks (long-delay WM and n-back tasks), but medication dosage positively correlates with demanding WM performance. In sum, our results show that WM impairment in PD patients depend on cognitive domain (simple vs. demanding WM task), subtype of PD patients (tremor- vs. akinesia-dominant), as well as disease duration and medication dosage. Our results have implications for the interrelationship between motor and cognitive processes in PD, and for understanding the role of cognitive training in treating motor symptoms in PD.     

Servant leadership and follower voice: the roles of follower felt responsibility for constructive change and avoidance-approach motivation

Our study contributes to research exploring the differential antecedents of employee promotive and prohibitive voice. We first examined the mediating role of employee felt responsibility for constructive change (FRCC) in the positive relationship between servant leadership and their prohibitive and promotive voice. We then tested the differential moderating effects of employee dispositional avoidance-approach orientation, where the indirect effect of servant leadership on prohibitive voice is weakened for the high avoidance-motivated, and the indirect effect of servant leadership on promotive voice is weakened for the high approach-motivated. To test our hypotheses, multi-source data were collected from 231 supervisor-supervisee dyads working in a range of companies and sectors in the Kingdom of Saudi Arabia. As predicted, employee FRCC mediates the positive relationship between servant leadership and prohibitive voice and these indirect effects are significantly weaker for the high avoidance-motivated. We did not observe the predicted weakening effects of high approach-motivation on the indirect relationship between servant leadership and promotive voice. It seems servant leaders may be less influential for those avoidance-motivated individuals already predisposed to enact prohibitive forms of voice, such as voicing concerns about harmful organizational processes and practices. Implications for social exchange and role theories, and managerial practice, are discussed.     

Effects of Trauma of the Gulf War on Kuwaiti Children

We investigated the effects of the Gulf War on two groups of Kuwaiti children and youth. Those children experiencing war-related traumatic events and those who did not experience or witness a war-related traumatic event participated. Data were obtained from the mother of each child. Each mother completed a structured interview which included Child Traumatic Reaction Index, developed according to the DSM-IV (1994) criteria for Post Traumatic Stress Disorder (PTSD). The data indicated a significant interaction effect observed by mothers according to the child's gender, experience of war traumatic events, and PTSD. The results are discussed in terms of the diagnostic criteria for PTSD, the necessity of early identification, and the difficulty associated with the diagnosing PTSD in children.     

Do as I Do: The Effect of Teachers’ Ethical Leadership on Business Students’ Academic Citizenship Behaviors

We studied the impact of teachers’ ethical leadership on students’ moral identity and academic citizenship behaviors. Data from 256 student–teacher matching dyads were collected from one of the top 5 Pakistani business schools. Confirmatory factor analysis was used to ensure factorial validity of the measures that were employed, and the hypothesized relationships were tested using structural regression models that utilized structural equation modeling in AMOS with 5,000 bootstrap samples. Based on social learning theory, the results supported the hypothesis that teachers’ ethical leadership had significant direct and indirect positive effects (i.e., through the students’ moral identity) on the students’ academic citizenship behaviors that were directed toward other students and the school. This study contributes to existing literature on ethical leadership and organizational citizenship behavior by highlighting useful implications of these organization-based constructs in an academic context.