Using Corticomuscular and Intermuscular Coherence to Assess Cortical Contribution to Ankle Plantar Flexor Activity During Gait

The present study used coherence and directionality analyses to explore whether the motor cortex contributes to plantar flexor muscle activity during the stance phase and push-off phase during gait. Subjects walked on a treadmill, while EEG over the leg motorcortex area and EMG from the medial gastrocnemius and soleus muscles was recorded. Corticomuscular and intermuscular coherence were calculated from pair-wise recordings. Significant EEG–EMG and EMG–EMG coherence in the beta and gamma frequency bands was found throughout the stance phase with the largest coherence towards push-off. Analysis of directionality revealed that EEG activity preceded EMG activity throughout the stance phase until the time of push-off. These findings suggest that the motor cortex contributes to ankle plantar flexor muscle activity and forward propulsion during gait.     

Improving the Generalization of Computer-Based Math Fluency Building Through the Use of Sufficient Stimulus Exemplars

Computers have become an important piece of technology in classrooms for implementing academic interventions. Often, students’ responses to these interventions are used to help make important educational decisions. Therefore, it is important to consider the effect of these interventions across multiple contexts. For example, previous research has demonstrated that when students practice math fact fluency on the computers gains did not generalize to paper–pencil performance. The current study extended this research by examining the effect of multiple stimulus exemplars on the generalization of computer-based math practice to paper–pencil performance. A total of 57 second-grade students completed fluency drills only on the computer, computer mixed with paper–pencil or with only paper–pencil. Pretest–posttest performance was evaluated using a 3 × 2 doubly multivariate repeated-measures ANOVA, with follow-up univariate analysis to determine whether the interaction between time and treatment type was similar across matched and unmatched treatment modalities. Results from previous research were replicated with a lack of generalization across modalities, but the addition of multiple stimulus exemplars resulted in increased generalization for those students receiving a mix of computer and paper–pencil practice.     

Subjective agency and awareness of shared actions

Voluntary actions and their distal effects are intimately related in conscious awareness. When an expected effect follows a voluntary action, the experience of the interval between these events is compressed in time, a phenomenon known as ‘intentional binding’ (IB). Current accounts of IB suggest that it serves to reinforce associations between our goals and our intention to attain these goals via action, and that IB only occurs for self-generated (i.e., intentional) actions. We used a novel approach to study IB in the context of shared intentions and actions. Pairs of participants judged the time of occurrence of actions and events attributed either to oneself or to another agent. We found that IB and subjective agency are not mutually predictive when an action can be attributed to only one of two ‘co-intending’ agents. Our results pose a complication for the prevailing view that IB and subjective agency reflect a common mechanism.     

Training and education for therapeutic practitionership: “Trans-modern” perspectives

In this paper I revisit the theme of therapy training, examined in this journal a decade ago in House (1996 House, R. 1996. The professionalization of counselling: A coherent ‘case against’?. Counselling Psychology Quarterly, 9(4): 343–358. [Taylor & Francis Online] [Google Scholar]. I first outline what I mean by the term “trans-modern” in the context of debates about “postmodern” and deconstructive approaches to therapy. I then explore the configuration that therapy training might plausibly take when technological rationality's positivistic certainties are dramatically undermined, and the path to becoming a therapy practitioner coheres more closely with the trans-modern, “New Paradigm” Zeitgeist–a world-view which both acknowledges the (albeit unbalanced) contributions of modernity, yet takes us well beyond modernity's constraining limitations. To illustrate my argument I focus on and problematize the role of theory in therapy training. I conclude with some speculations about plausible paths that a trans-modern approach to therapy training might profitably take in future.     

近距离的鞭挞与远距离的哲思

面对当今"人造美女"的现象,仅有批评的激愤与学术睿智是不够的,更需要哲人式的深刻与从容.今后人们需要改变的是既定的认知观念,而不是"医疗美容"所代表的新的心理、社会层面的服务诉求.     

Luria-nebraska neuropsychological battery: High rates of false positives for geriatirc subjects

This study examined false positive rates obtained for two normal adult age groups, using three different methods for interpreting performances on the Luria-Nebraska Neuropsychological Battery (LNNB). Among normal subjects ages 18 to 30 and ages 65 to 85, false positive rates were found to range from 3.9% to 7.7% for younger subjects and 13.5% to 32.7% for older subjects. Significant differences were found between the proportion of false positives in each age group on each method of interpretation. A lack of agreement was found between the three different methods of interpretation concerningwhich subjects should be classified as impaired. Further analysis was performed by dividing older subjects into two groups, ages 65 to 70 and over 70. False positive rates for subjects over age 70 were found to range from 20.7% to 41.4%. Significant differences were also found between the proportion of false positives in each of these two groups.     

'Limits to therapy and counselling': Deconstructing a professional ideology

The rapidity with which therapy, as discourse and as clinical—professional practice, has become established in contemporary culture is subjected to a searching deconstructive critique. Specifically, it is argued that therapy's pretensions to being a legitimate professional, clinical practice are not only highly questionable, but actually constitute a self-serving and ethically questionable ideology. The 'scientific' status of therapy as a modernist enterprise is argued to be fundamentally undermined by new-paradigm epistemologies. It is further argued that, in its professionalised, commodified form, therapy can become routinely and intrinsically abusive to the extent that it self—fulfillingly constructs a framework which then serves to guarantee its own legitimacy within a discursive 'regime of truth'. Parker's important work on discourse and power is drawn upon to illustrate these radical arguments, and to make the case for an approach to therapy which is ongoingly and processually deconstructive of its 'professional' ideologies and clinical practices, if the kinds of dangers outlined are to be avoided. Such deconstruction would also include an ongoing and explicit interrogation of 'therapy' as an historically specific, evolving and, it is submitted, transitory cultural practice. Deep and honest ethical reflection is needed on the nature of therapy, and on the possibility of developing more healthily appropriate socio-cultural forms for helping people with their 'difficulties of living'.     

Relation of work and retirement to health and well-being in older age.

Patterns of labor-force participation were studied with a broad array of indicators of physical and psychological well-being. The sheer amount of work--whether people work and, if so, how many hours they work--shows little relationship to health and well-being. Drawing on scattered existing research and theory, it is hypothesized and found that persons whose patterns of labor-force participation (or nonparticipation) reflect their personal preference report higher levels of physical and psychological well-being than do those whose level of labor-force involvement is constrained by other factors. The results do not differ by gender, age (65 years and older vs. 55-64 years), or occupation (professional vs. clerical or sales vs. blue-collar workers). Data are from 1,339 respondents 55 years of age or older in the Americans' Changing Lives Survey, a large national, cross-sectional survey of Americans 25 years of age and older with an oversample of those 60 years of age and older, and are analyzed by ordinary least squares multiple regression.