Semantic categorization in the human brain: spatiotemporal dynamics revealed by magnetoencephalography

We examined the cortical representation of semantic categorization using magnetic source imaging in a task that revealed both dissociations among superordinate categories and associations among different base-level concepts within these categories. Around 200 ms after stimulus onset, the spatiotemporal correlation of brain activity elicited by base-level concepts was greater within than across superordinate categories in the right temporal lobe. Unsupervised clustering of data showed similar categorization between 210 and 450 ms mainly in the left hemisphere. This pattern suggests that well-defined semantic categories are represented in spatially distinct, macroscopically separable neural networks, independent of physical stimulus properties. In contrast, a broader, task-required categorization (natural/man-made) was not evident in our data. The perceptual dynamics of the categorization process is initially evident in the extrastriate areas of the right hemisphere; this activation is followed by higher-level activity along the ventral processing stream, implicating primarily the left temporal lobe.     

But I can’t pass that far! The influence of motor skill on decision making

Objectives

The influence of motor skill on perceptual-cognitive and perceptual-motor decision making has been theorised but not verified empirically.

Method

Expert (n = 19), developmental (n = 20), and lesser-skilled netballers (n = 19) completed tests designed to evaluate three different components of domain-specific expertise: (i) motor skill-execution; (ii) perceptual-cognitive decision making; and (iii) perceptual-motor decision making.

Results

Each of the three measures was found to improve commensurate with domain-specific skill. Decisions requiring movements (perceptual-motor) elicited more accurate decision making than simple verbal responses (perceptual-cognitive), irrespective of participant skill. Although motor skill was found to be related to the successful execution of a most appropriate movement in a game situation, it was not found to limit the nature of the decision made by participants. No evidence was found to support the supposition that lesser-skilled participants bias their perceptual-cognitive decisions towards ones supported by their motor ability.

Conclusions

Results fail to comprehensively support the contemporary models for the development of perceptual-cognitive and perceptual-motor skill in sport.     

Implicit need for affiliation is associated with increased corrugator activity in a non-positive, but not in a positive social interaction

Affective changes in response to motive-relevant stimuli are a defining feature of implicit motives. We therefore expected to find an effect of individual differences in the implicit need for affiliation (nAff) on corrugator supercilii activity, an indicator of affect, when participants were confronted with nonverbal indicators of a conversational partner’s withdrawal. Participants’ nAff was assessed with a Picture Story Exercise (PSE). They were then involved in an interaction with a smiling or a neutral experimenter while their corrugator activity was measured with electromyography (EMG). As expected, we found higher corrugator activity for people high in nAff compared to people low in nAff when the experimenter kept a neutral facial expression throughout the interaction but not when he/she was smiling.     

On the modularity of implicit sequence learning: independent acquisition of spatial, symbolic, and manual sequences

Learning sequential structures is of fundamental importance for a wide variety of human skills. While it has long been debated whether implicit sequence learning is perceptual or response-based, here we propose an alternative framework that cuts across this dichotomy and assumes that sequence learning rests on associative changes that can occur concurrently in distinct processing systems and support the parallel acquisition of multiple uncorrelated sequences. In three experiments we used a serial search task to test critical predictions of this framework. Experiments 1 and 2 showed that participants learnt uncorrelated sequences of auditory letters and manual responses, as well as sequences of visual letters, spatial locations, and manual responses simultaneously, as indicated by a reliable response time (RT) cost incurred by occasional deviants violating either of the sequences. This RT cost was reliable even when participants showing explicit knowledge were excluded. In Experiment 3 learning of spatial and nonspatial sequences was functionally dissociated: whereas a spatio-motor distractor task disrupted learning of location but not of letter sequences, a phonological distractor task had the reverse effect. The distractor tasks thus did not reduce unspecific attentional resources, but selectively disrupted the formation of sequential associations within spatial and nonspatial processing dimensions. These results support the view that implicit sequence learning rests on experience-dependent changes that can occur in parallel in multiple processing systems involved in spatial attention, object recognition, phonological processing, and manual response selection. The resulting dimension-specific sequence representations support independent predictions of what will appear next, where it will appear, and how one will have to respond to it.     

Unmitigated agency, social support, and psychological adjustment in men with cancer

Unmitigated agency (UA), a gender-linked characteristic, has been associated with poorer cancer adjustment. Support from one's social network typically predicts adjustment but may be poorly matched to UA. The influence of UA on the utility of social support on adjustment over time is examined. Men with cancer (N=55) were assessed initially and 6 months later on three indicators of adjustment. Multilevel modeling analyses varied by adjustment indicator. UA was associated with increased cancer-related psychosocial symptoms but not depressive symptoms or cancer-related thought intrusion. Social support predicted fewer depressive symptoms and less cancer-related thought intrusion. However, a cross-level interaction revealed that the utility of social support on cancer-related thought intrusion was weaker for men with greater levels of UA. Men with cancer likely respond differently to changes in social support depending on their endorsement of UA.     

Do proposed facial expressions of contempt, shame, embarrassment, and compassion communicate the predicted emotion?

Shame, embarrassment, compassion, and contempt have been considered candidates for the status of basic emotions on the grounds that each has a recognisable facial expression. In two studies (N=88, N=60) on recognition of these four facial expressions, observers showed moderate agreement on the predicted emotion when assessed with forced choice (58%; 42%), but low agreement when assessed with free labelling (18%; 16%). Thus, even though some observers endorsed the predicted emotion when it was presented in a list, over 80% spontaneously interpreted these faces in a way other than the predicted emotion.     

Assessing Parenting Skills and Attitudes: A Review of the Psychometrics of Parenting Measures

There are many measures that assess parenting skills or practices, such as behavior, beliefs, coping mechanisms, reactions to stress, or discipline. However, little is known about the psychometric quality of these parenting measures. This information is essential for practitioners and researchers to aide in the selection of the most valid and reliable measures to assess parenting behavior or attitudes. This study examined the psychometric quality among parenting measures published from 1985 to 2009. After the initial search 164 measures were identified, but were reduced to 25 measures that supplied some degree of psychometric information, were published in the United States or Canada, and were in English. Measures were compared across numerous categories including respondent type, norming data, administration type, and ten psychometric variables such as internal consistency, content validity, and predictive validity. Out of the 25 measures, seven had no acceptable psychometric properties, seven had only 1–2 acceptable ratings on psychometric properties, six had between 3 and 4 acceptable psychometric ratings, none had between 5 and 6 acceptable ratings, and only five had strong psychometric properties in seven or more of the 10 categories. Likewise, only five measures provided and norming information and 14 measures provided scoring procedures. Implications, limitations, and recommendations for future research are discussed.     

Reducing Psychotropic Medications in an Intensive Residential Treatment Center

Medication rates in behaviorally disordered children and youth have greatly increased to current high levels and are very controversial. This study examined changes in psychotropic medication use, levels of behavioral disturbance, and use of personal restraint and seclusion in a population of youth with serious behavioral disorders receiving medically directed cognitive-behavioral treatment in an intensive residential setting. The hypothesis was that there would be significant reductions in medication rates, without the unintended consequences of increased rates of problem behavior or offsetting increases in the use of seclusion or personal restraint. Results showed significant reductions in both the number of youth on medication and the average number of psychotropic medications during the residential stay. There were also significant reductions in behavioral disturbance, seclusions, and personal restraints. These results demonstrate that psychotropic medication can be significantly reduced without increases in problem behavior or the use of seclusions or personal restraints. We conclude that it is possible to significantly reduce psychotropic medication rates to far more conservative levels within the context of a clinically directed cognitive-behavioral treatment milieu.     

Psychotropic Medication Management Within Residential Treatment Centers: Physician Opinions About Difficulties and Barriers

Research has shown that between 40 and 98 % of youth entering residential treatment are taking at least one psychotropic medication and that psychotropic medication management is often an integral component of treatment in residential settings. To determine physician opinion about the difficulty of managing psychotropic medications for youth in residential treatment and to determine the resources that are used in the process, a survey study was conducted. Overall, physicians indicated that youth involved in residential settings were much more complex than those in traditional outpatient settings, due to multiple mental health diagnoses, polypharmacy, and unknown treatment histories. They also reported that many existing resources are not applicable to youth, particularly those in residential settings, and that they are difficult to read and interpret.     

Interaction Between the Parenting Alliance and Parent–Child Activities in a Clinic-Referred Sample of 2 to 18-year-olds

Several decades of research have demonstrated a link between marital, parenting, and child domains. The present study examined the nature of these links by testing the moderating effect of the parent–child relationship on the association between the parenting alliance and internalizing and externalizing problems in 324 dual-parent families of 2-to-18-year-old clinic-referred youth. Findings indicated that positive parent–child activities directly related to children’s internalizing and externalizing problems, and modified the nature of the association between the parenting alliance and internalizing problems in families of 6-to-10-year-olds. Interestingly, in families where parents engaged in fewer positive activities with their children, a strong parenting alliance actually related to greater child internalizing problems. Findings support the importance of understanding the interaction between the marital and child domains in order to effectively intervene with families of children experiencing behavior problems.