Noninvasive Brain Stimulation over the M1 Enhances Bimanual Force Control Ability: A Randomized Double-Blind Sham-Controlled Study

Well-coordinated bimanual force control is common in daily life. We investigated the effects of anodal transcranial direct current stimulation (tDCS) over the primary motor cortex on bimanual force control. Under a cross-over study, young adults (n = 19; female = 6, male = 13) completed three bimanual force control tasks at 5%, 25%, and 50% of bimanual maximum voluntary force (BMVF) before and after real or sham tDCS. Real tDCS enhanced accuracy at all BMVF, reduced variability at 5% BMVF, and increased coordination at 5% BMVF. Real tDCS improved force control at 5% and 25% BMVF, and especially increased bimanual coordination at 5% BMVF. These findings might have implications for establishing interventions for patients with hand force control deficits.     

Serial and subjective clustering on a verbal learning test (VLT) in children aged 5–15: The nature of subjective clustering

This study investigated which strategies children aged 5–15 years (N?=?408) employ while performing a multitrial free recall test of semantically unrelated words. Serial clustering (i.e., a relatively passive strategy) is an index of the sequential consistency of recall order. Subjective clustering (i.e., a more active strategy) is based on similar word groupings in successive trials. Previously, Meijs et al. (2009 Meijs, C. J. C., Hurks, P. P. M., Kalff, A. C., Slaats-Willemse, D. I. E., Rozendaal, N. and Jolles, J. 2009. Differential development of learning strategies on a Pictorial Verbal Learning Test (PVLT) in primary school children. Child Neuropsychology, 15: 247–261. [Taylor &; Francis Online], [Web of Science ®] , [Google Scholar]) found that the level of (serial and subjective) clustering increases with age. At all ages, the level of serial clustering correlates positively with the ability to recall information on VLT trials. However, subjective clustering is more predictive of VLT performance than serial clustering after ≥ 3 trials, but only in children aged 8+. Knowledge on how children organize words (based on, for example, sound or meaning) and how this relates to developmental stage is still lacking. This study revealed that the level of subjective clustering is primarily determined by the position of words in a VLT list. More specifically, primacy (i.e., recall of words 1–3 of the VLT list — whether recalled in the same order or reversed) and recency (i.e., recall of words 14–15) effects primarily determine level subjective organization over successive trials. Thus, older children still organize words based on the serial position of the VLT list and are much less likely to organize them based on any other feature of the words, for example, sound or meaning. This indicates that the most important information to be learned needs to be presented first or last, even in older children and even with repeated presentations.     

Toddlers use speech disfluencies to predict speakers' referential intentions

The ability to infer the referential intentions of speakers is a crucial part of learning a language. Previous research has uncovered various contextual and social cues that children may use to do this. Here we provide the first evidence that children also use speech disfluencies to infer speaker intention. Disfluencies (e.g. filled pauses 'uh' and 'um') occur in predictable locations, such as before infrequent or discourse-new words. We conducted an eye-tracking study to investigate whether young children can make use of this distributional information in order to predict a speaker's intended referent. Our results reveal that young children (ages 2;4 to 2;8) reliably attend to speech disfluencies early in lexical development and are able to use disfluencies in online comprehension to infer speaker intention in advance of object labeling. Our results from two groups of younger children (ages 1;8 to 2;2 and 1;4 to 1;8) suggest that this ability emerges around age 2.     

Spirituality and Cardiovascular Risk

This study extended current research linking spirituality to health by investigating the relationship between extrinsic and intrinsic spirituality and cardiovascular risk factors. Participants included 111 healthy males and females, ages 28 to 63. Measurements consisted of the Lifestyle Assessment Questionnaire (LAQ), a version of Kelly's Repertory Grid, hematological analysis, and blood pressure. A greater sense of spirituality was associated with lower cholesterol risk ratios (total cholesterol/HDL) and triglyceride levels. In addition, the structural or organizational characteristics of intrinsic spirituality were associated with several other hematological measures. Further research will help clarify the association between mechanisms underlying spirituality and health, including susceptibility to cardiovascular disorders.     

Empowering Change Agents: Youth Organizing Groups as Sites for Sociopolitical Development

In addition to social action campaigns, some youth organizing groups provide formative learning experiences which engage youth in relevant sociopolitical issues through critical approaches. These groups support sociopolitical development (SPD), a self and socially‐oriented process which influences youth personally, politically, and professionally into adulthood. This study explored how youth organizing experiences influenced SPD in the professional domain, applying an empowerment lens. Phenomenologically‐based interviews were conducted with former sexual health education youth organizers and adult program staff. Former youth participants chose socially‐oriented career paths influenced by the group's empowering approach to sexual health education and advocacy. They related meaningful sociopolitical learning experiences (e.g., interpersonal, educational, and civic engagement) to empowerment outcomes (e.g., political efficacy, critical awareness, and participatory behaviors) which informed career decisions. Professionally, participants sought to empower others as the group empowered them, drawing upon youth organizing social and human capital as they worked toward this aim. Combining sociopolitical and empowerment theorizing, the study adds to what is known about how purposefully designed youth organizing experiences support long‐term development outcomes for individuals. Viewed as socially‐oriented career development sites, youth organizing groups build capacity for social change beyond the groups themselves. Implications for youth organizing scholars and practitioners are provided.     

Analogue functional analysis of movements associated with tardive dyskinesia

We studied whether movements associated with tardive dyskinesia (TD) served operant functions in 2 men with developmental disabilities. We found that TD-related movements occurred more frequently in the alone and attention conditions and less frequently in control and demand conditions. Our findings suggest that TD-related movements may not be maintained by social reinforcers and that decreases in TD movements are possibly a result of engagement in activities that are incompatible with TD movements.     

Native Amazonian children forego egalitarianism in merit‐based tasks when they learn to count

Cooperation often results in a final material resource that must be shared, but deciding how to distribute that resource is not straightforward. A distribution could count as fair if all members receive an equal reward (egalitarian distributions), or if each member's reward is proportional to their merit (merit‐based distributions). Here, we propose that the acquisition of numerical concepts influences how we reason about fairness. We explore this possibility in the Tsimane’, a farming‐foraging group who live in the Bolivian rainforest. The Tsimane’ learn to count in the same way children from industrialized countries do, but at a delayed and more variable timeline, allowing us to de‐confound number knowledge from age and years in school. We find that Tsimane’ children who can count produce merit‐based distributions, while children who cannot count produce both merit‐based and egalitarian distributions. Our findings establish that the ability to count – a non‐universal, language‐dependent, cultural invention – can influence social cognition.     

Perceptions Of Treatment Helpfulness And Depressive Symptomology In Psychiatric Inpatients On A Cognitive Therapy Unit

This study examined 123 psychiatric inpatients' perceptions of treatment helpfulness using the Treatment Experience Questionnaire (TEQ), a measure that includes perceived elpfulness ratings for specific cognitive and non-cognitive aspects of treatment. It was predicted that (a) the inpatients on the cognitive therapy unit would perceive the cognitive therapy components of the program as more helpful than the non-cognitive components, and that (b) the perception of the helpfulness of the cognitive and noncognitive therapy components would significantly predict discharge depression scores, as measured by the Beck Depression Inventory (BDI). The results indicated that the inpatients rated the helpfulness of both the cognitive and non-cognitive aspects of treatment highly and that there was a modest yet significant relationship between perceived helpfulness and symptom change. The BDI scores at admission explained considerably more of the variation in discharge BDI scores than the perceptions of helpfulness. These results are discussed in light of past and future research.     

Responding to a positive stimulus by “satiated” pigeons

Skinner (1938) found that rats given discrimination training (Phase I) and then reinforced to “satiation” for responses in the presence of the negative stimulus (S?) (Phase II), began to respond again when the positive stimulus (S+) was reintroduced (Phase III). Experiment I replicated Skinner's finding with pigeons, alternating S+ and S? presentations during Phase III. In Experiment II, Phase II was extended, and Phase III results were similar to those of Experiment I, demonstrating that the recovery of S+ responding could not be attributed to a lax Phase II satiation criterion. In Experiment III, a uniform schedule of reinforcement was maintained throughout the three phases, and results similar to those of Experiment I were found, indicating that renewed S+ responding was not due to the shift in schedule between phases. In Experiment IV, Phase I consisted of discrimination training with two positive stimuli (S+_s and S+_n), and Phase II consisted of reinforcement for responses in the presence of S? and S+_s. During Phase III, significantly more responding was found to S+_s and S+_n than to S?, but no difference in responding was found between the two positive stimuli. In Experiment V, Phase I consisted of simple discrimination training, and during Phase II, responses in the presence of both S? and a novel stimulus (So) were reinforced. During Phase III, significantly more responding was found to S+ than to either S? or So, with no difference found between S? and So responding. Renewed responding to S+ during Phase III in the present experiments is best explained by behavioral contrast developed during Phase I.