Wavelet analysis of neuroelectric waveforms: a conceptual tutorial

This paper presents a nontechnical, conceptually oriented introduction to wavelet analysis and its application to neuroelectric waveforms such as the EEG and event related potentials (ERP). Wavelet analysis refers to a growing class of signal processing techniques and transforms that use wavelets and wavelet packets to decompose and manipulate time-varying, nonstationary signals. Neuroelectric waveforms fall into this category of signals because they typically have frequency content that varies as a function of time and recording site. Wavelet techniques can optimize the analysis of such signals by providing excellent joint time-frequency resolution. The ability of wavelet analysis to accurately resolve neuroelectric waveforms into specific time and frequency components leads to several analysis applications. Some of these applications are time-varying filtering for denoising single trial ERPs, EEG spike and spindle detection, ERP component separation and measurement, hearing-threshold estimation via auditory brainstem evoked response measurements, isolation of specific EEG and ERP rhythms, scale-specific topographic analysis, and dense-sensor array data compression. The present tutorial describes the basic concepts of wavelet analysis that underlie these and other applications. In addition, the application of a recently developed method of custom designing Meyer wavelets to match the waveshapes of particular neuroelectric waveforms is illustrated. Matched wavelets are physiologically sensible pattern analyzers for EEG and ERP waveforms and their superior performance is illustrated with real data examples.     

EYE MOVEMENTS REVEAL THE SPATIOTEMPORAL DYNAMICS OF VISUAL SEARCH

Abstract— Given that attention precedes an eye movement to a target it becomes possible to use fixation sequences to probe the spatiotemporal dynamics of search Applying this method to a realistic search task, we found eye movements directed to the geometric centers of progressively smaller groups of objects rather than accurate fixations to individual objects in a display Such a binary search strategy is consistent with zoom-lens models panting an initially broad distribution of search, followed by a narrowing of this search region until only the target is selected We also interpret this oculo-motor averaging behavior as evidence for an initially parallel search analysis that becomes increasingly serial as the search process converges on the target.     

Subjective evaluations of employer attributes by administration students

The paper is an application of the conjoint measurement methodology. An exploratory study was conducted of the trade-off relationships among four organizational attributes—dynamism, societal concern, functional/administrative emphasis, and relative size—as they relate to the selection of an employer by students of administration. Preference ranks of 36 employer concepts obtained from 86 graduate students of business, public, and hospital administration were analyzed according to the additive conjoint measurement model yielding implicit rank-ordering of the four organizational attributes as choice criteria. Irrespective of the program of study, dynamism and societal concern emerged as the most important determinants in employer selection, but differences existed among programs, year of study, and explicitly vs implicitly elicited weights.     

Dyadic association between aggressive pretend play and children’s anger expression

This study investigates the association between children’s peer-reported expression of anger and their pretend play with aggressive/negative themes observed during spontaneous play with classmates. Participants comprised 104 Chinese children (M_age = 8.98 years, SD = 0.97, 49% girls) and were filmed playing in peer dyads with toys. Aggressive and non-aggressive negative pretend themes were coded at five-second intervals for 10 minutes. Children’s expression of anger in real situations was reported by peers. Analysis using actor–partner interdependence modelling (APIM) revealed significant partner effects, indicating that children were more likely to engage in pretend play with aggressive themes when they were playing with a partner who was perceived by their peers as more easily angered. It was also found that boys were more likely to engage in pretend play with both aggressive and non-aggressive negative themes compared with girls.     

Positive and Negative Affect in Loss Aversion: Additive or Subtractive Logic?

Previous studies explain loss aversion as the result of a situation in which the expected negative emotions derived from a potential loss exceed the expected positive emotions derived from a potential gain (subtractive logic). We questioned this view and proposed additive logic, in which a linear combination between negative and positive emotions can be used as summed anticipatory affect intensity (SAAI) to explain loss aversion. By disproving two implicit hypotheses of subtractive logic, Study 1 showed that the additive logic of expected positive and negative affect was more effective than the subtractive logic in predicting loss aversion. Study 2 used real monetary gains and losses to verify the conclusion in Study 1. Using state‐trait theory to comprehensively consider the state and trait aspects of affect intensity, we further deduced that the immediate expected affect intensity might originate from the difference of an individual trait in affect intensity. Study 3 proved this hypothesis and showed that SAAI plays an intermediary role between affect intensity and loss aversion. Furthermore, Study 4 used real gamblers in casinos in Macau as its sample and obtained the same conclusion regarding loss aversion in real life as was found in the laboratory. Finally, we explained the effect of SAAI on loss aversion and indicated the contribution and significance of this study. Copyright © 2015 John Wiley & Sons, Ltd.     

Predispositions to Lymphoma: <Emphasis Type="Italic">A Practical Review for Genetic Counselors</Emphasis>

This review provides a synopsis for genetic counselors of the major concepts of lymphoma predisposition: genomic instability, immune deficiency, inappropriate lymphoproliferation, and chronic antigen stimulation. We discuss syndromes typifying each of these mechanisms. Importantly, our review of the genetic counseling literature reveals sparse discussion of genetically-based immune-mediated lymphoma predisposition, which we address in depth here. We aim to increase awareness among genetic counselors and colleagues in oncology about familial susceptibility and facilitate critical thinking about lymphoma risk assessment. Clinical application of this knowledge is aided by recommendations for collection of personal and family history to guide risk assessment and testing. Lastly, we include a special discussion of genetic counseling issues including perceptions of the context, nature, and magnitude of lymphoma risk, as well as coping with awareness of susceptibility to lymphoma.     

Organizational Learning: The Role of the Physical Environment

This paper examines the role of the physical environment in facilitating organizational learning. Semi-structured interviews related to learning and experiences of physical environment were conducted in two organizations in India. Workspaces were studied using non-participant observation. Cognitive maps of the layouts were created and movements in the workspaces mapped. Content analysis was performed on interview responses, and space syntax analysis was used to analyse maps of the workspaces. Findings suggest that knowledge in organizations is transformed through dialogue and discussion. Relationships, supportive leadership, culture, organizational strategy, and physical environment were found to play a key role in facilitating this process. The physical environment afforded co-presence, movement, and encounter. These features were found to contribute to interaction that facilitated dialogue, and thereby transformation of knowledge. This paper highlights the importance of physical design and provides areas of concrete intervention, allowing for facilitation of learning based on the physical dimension of the learning context.