Towards a functional neural systems model of developmental stuttering

This paper overviews recent developments in an ongoing program of brain imaging research on developmental stuttering that is being conducted at the University of Texas Health Science Center, San Antonio. This program has primarily used H₂¹⁵O PET imaging of different speaking tasks by right-handed adult male and female persistent stutterers, recovered stutterers and controls in order to isolate the neural regions that are functionally associated with stuttered speech. The principal findings have emerged from studies using condition contrasts and performance correlation techniques. The emerging findings from these studies are reviewed and referenced to a neural model of normal speech production recently proposed by Jürgens [Neurosci. Biobehav. Rev. 26 (2002) 235]. This paper will report (1) the reconfiguration of previous findings within the Jürgens Model; (2) preliminary findings of an investigation with late recovered stutterers; (3) an investigation of neural activations during a treatment procedure designed to produce a sustained improvement in fluency; and (4) an across-studies comparison that seeks to isolate neural regions within the Jürgens Model that are consistently associated with stuttering. Two regions appear to meet this criterion: right anterior insula (activated) and anterior middle and superior temporal gyri (deactivated) mainly in right hemisphere. The implications of these findings and the direction of future imaging investigations are discussed.

Educational objectives: The reader will learn about (1) recent uses of H₂¹⁵O PET imaging in stuttering research; (2) the use of a new neurological model of speech production in imaging research on stuttering; and (3) initial findings from PET imaging investigations of treated and recovered stutterers.     

CREATING NEW REALITIES: PROGRAM DEVELOPMENT AND DISSEMINATION

Program development and dissemination in human services present challenges and opportunities for social scientists. Over the past 27 years the Teaching-Family Model of group home treatment has moved from prototype development to widespread dissemination across North America. Reviewing concepts in industry related to product development and dissemination, the application of these concepts to a human services delivery system, and program replication and dissemination data offer information about how innovative human services can be widely adapted and adopted.     

The Demand-Control Model: Specific Demands, Specific Control, and Well-Defined Groups

The purpose of this study was to test the Demand-Control Model (DCM), accompanied by three goals. Firstly, we used alternative, more focused, and multifaceted measures of both job demands and job control that are relevant and applicable to today's working contexts. Secondly, this study intended to focus on particular demands in human services work and to incorporate these demands in the DCM. Finally, this occupation-based study investigated relatively large well-defined subgroups compared to a total sample. Workers from five human service sectors (n = 2,485) were included in a cross-sectional survey (i.e., health care, transport, bank/insurance, retail trade, and warehouse). Results showed that job demands and job control are able to show several interaction effects on employee well-being and health, but only in specific occupational groups. In conclusion, the current findings provide renewed empirical support for the view that high-strain jobs (high demand, low control) are conducive to ill health (i.e., emotional exhaustion, psychosomatic health complaints). Further, it appears that active jobs (high demands, high control) give rise to positive outcomes (i.e., job challenge, job satisfaction).     

Simple Threshold Rules Solve Explore/Exploit Trade-offs in a Resource Accumulation Search Task

How, and how well, do people switch between exploration and exploitation to search for and accumulate resources? We study the decision processes underlying such exploration/exploitation trade-offs using a novel card selection task that captures the common situation of searching among multiple resources (e.g., jobs) that can be exploited without depleting. With experience, participants learn to switch appropriately between exploration and exploitation and approach optimal performance. We model participants' behavior on this task with random, threshold, and sampling strategies, and find that a linear decreasing threshold rule best fits participants' results. Further evidence that participants use decreasing threshold-based strategies comes from reaction time differences between exploration and exploitation; however, participants themselves report non-decreasing thresholds. Decreasing threshold strategies that “front-load” exploration and switch quickly to exploitation are particularly effective in resource accumulation tasks, in contrast to optimal stopping problems like the Secretary Problem requiring longer exploration.     

Self-medication Hypothesis and Family Socialization Theory: Examining Independent and Common Mechanisms Responsible for Binge Drinking

For many, binge drinking behaviors start early and become a persistent pattern of use throughout the lifespan. In an effort to strengthen understanding of etiology, this study considered the mechanisms from the self-medication hypothesis and family socialization theory. The goal was to identify whether emotional distress is a potential shared mechanism that accounts for the development of binge drinking in different developmental periods. This study used the National Longitudinal Study of Adolescent to Adult Health (Add Health) dataset to examine binge drinking across time for n = 9,421 participants ranging in age from 11 to 18 (M = 15.39, SD = 1.62) at Wave I and ranging from 24 to 32 (M = 28.09, SD = 1.61) at Wave IV of the study. Using an autoregressive cross-lagged model, I examined how parent-child closeness, depressive symptoms, and binge drinking were related over three developmental periods. In examining cross-sectional and longitudinal relations, depressive symptoms were significantly related to binge drinking more often than parent-child closeness; however, results indicated the self-medication model may primarily account for concurrent drinking behaviors rather than long-term. The family socialization theory was indicated to account for some variability above and beyond the self-medication hypothesis. No indirect association between binge drinking and the parent-child relationship was detected through depressive symptoms, failing to support a shared mechanism between the two theories. The results provide support for a multifaceted assessment process for substance using clients, and support the use of Multisystemic Family Therapy, Multidimensional Family Therapy, and perhaps Attachment-Based Family Therapy.     

Characterizing positive and negative ‘voicers’ in elite sport teams: The role of the Five Factor Model and narcissism in players’ frequency and passing on of voice

ObjectiveThis study examined the role of the Five Factor Model and grandiose narcissism in players’ positive (i.e., constructive voice, supportive voice) and negative voice (i.e., defensive voice, destructive voice) in elite sport teams.MethodPlayers from six field hockey and seven korfball teams from the two highest national levels were assessed for four weeks. Using social network analyses, players’ personality was related to their self-reported voice frequency, their voice frequency as perceived by all teammates (other-ratings), and the extent to which they pass on voice.ResultsExtraversion was positively related to players’ frequency of positive and negative voice. Other traits such as conscientiousness and emotional stability were only related to, respectively, positive or negative types of voice. Not all personalities (e.g., extraversion) were consistent in how they assess their own voice versus how others perceive this. Interestingly, traits such as extraversion, emotional stability and the agentic facet of narcissism were found to predict the passing on of voice.ConclusionThis study explored the importance of personality for (a) players’ frequency of a differentiated set of positive and negative voice and (b) the extent to which they function as ‘gates’ that more covertly pass on voice. Further, the results provide perspective on how specific personalities view their voice behavior versus how their teammates perceive their voice behavior. In this way, this study is a first step in identifying players who have the potential to endanger or strengthen a team in a clear or subtle, yet influential way.     

一种新的智力观--塞西的智力生物生态学模型述评

美国心理学教授塞西在对传统智力心理测量学理论批评的基础上于1990年提出了信息加工取向的智力的生物生态学模型。这一模型主要有四个基本假设,即智力是一个多种资源系统;生物潜能与环境力量的相互作用;适宜的“最近过程”是智力发展的“引擎”;把“动机”整合到智力发展中。塞西智力的生物生态学模型为我们揭示人的智力的本质提供了一个新的视角。     

人格、文化与主观幸福感的关系及整合模型述评

在对主观幸福感的研究历史、两个独立的相关研究及其近期发展趋势作了回顾后,着重介绍了人格、文化与主观幸福感的整合模型（调节—缓和模型）,指出了这一模型的重要价值及其存在的不足。在此基础上,提出了模型进一步完善和发展的方向。