Spontaneous transitions in the coordination of a whole body task.

This paper describes an example of spontaneous transitions between qualitatively different coordination patterns during a cyclic lifting and lowering task. Eleven participants performed 12 trials of repetitive lifting and lowering in a ramp protocol in which the height of the lower shelf was raised or lowered 1 cm per cycle between 10 and 50 cm. Two distinct patterns of coordination were evident: a squat technique in which moderate range of hip, knee and ankle movement was utilised and ankle plantar-flexion occurred simultaneously with knee and hip extension; and a stoop technique in which the range of knee movement was reduced and knee and hip extension was accompanied by simultaneous ankle dorsi-flexion. Abrupt transitions from stoop to squat techniques were observed during descending trials, and from squat to stoop during ascending trials. Indications of hysteresis was observed in that transitions were more frequently observed during descending trials, and the average shelf height at the transition was 5 cm higher during ascending trials. The transitions may be a consequence of a trade-off between the biomechanical advantages of each technique and the influence of the lift height on this trade-off.     

The preparation of reach to grasp movements in adults with Down syndrome.

The aim of this study was to determine the extent to which adults with Down syndrome (DS) are able to utilise advance information to prepare reach to grasp movements. The study comprised ten adults with DS; ten children matched to an individual in the group with DS on the basis of their intellectual ability, and twelve adult controls. The participants used their right hand to reach out and grasp illuminated perspex blocks. Four target blocks were positioned on a table surface, two to each side of the midsagittal plane. In the complete precue condition, participants were provided with information specifying the location of the target. In the partial precue condition, participants were given advance information indicating the location of the object relative to the midsagittal plane (left or right). In the null condition, advance information concerning the position of the target object was entirely ambiguous. It was found that both reaction times and movement times were greater for the participants with DS than for the adults without DS. The reaction times exhibited by individuals with DS in the complete precue condition were lower than those observed in the null condition, indicating that they had utilised advance information to prepare their movements. In the group with DS, when advance information specified only the location of the target object relative to the midline, reaction times were equivalent to those obtained when ambiguous information was given. In contrast, the adults without DS exhibited reaction times that were lower in both the complete and partial precue conditions when compared to the null condition. The pattern of results exhibited by the children was similar to that of the adults without DS. The movement times exhibited by all groups were not influenced by the precue condition. In summary, our findings indicate that individuals with DS are able to use advance information if it specifies precisely the location of the target object in order to prepare a reach to grasp movement. The group with DS were unable, however, to obtain the normal advantage of advance information specifying only one dimension of the movement goal (i.e., the position of an object relative to the body midline).     

“I am because we are:” collectivism as a foundational characteristic of African American college student identity and academic achievement

This study extends current research on African American college student achievement by focusing on collectivism, a key characteristic of African American racial identity. Collectivism serves as the framework for analysis of students’ beliefs about the purpose of higher education, conceptualization of their roles and responsibilities as students, and the ways that students measure academic success within the context of a predominantly White university. Given that a conflict between students’ background and the culture of the university environment can exist, the findings offer educators insight into the unique experiences and achievement aspirations of African American college students and strategies to effectively mentor and support them.     

Daily mood and stress predict pain, health care use, and work activity in African American adults with sickle-cell disease.

This study examined the extent to which daily mood and stress were associated with pain, health care use, and work activity in 41 adults (mean age=36 years) with sickle-cell disease. Multilevel model analyses of daily diaries (M=91 days) indicated that increases in stress and negative mood were associated with increases in same-day pain, health care use, and work absences. Lagged models suggested bidirectional relationships, with evidence that pain may be the more powerful initiating variable in pain-mood and pain-stress cycles. Of importance, positive mood was associated with lower same-day and subsequent day pain, as well as fewer health care contacts, suggesting that positive mood may serve to offset negative consequences of pain and other illness symptoms.     

Perceptual priming is not a necessary consequence of semantic classification of pictures

Four experiments investigated how repetition priming of object recognition is affected by the task performed in the prime and test phases. In Experiment 1 object recognition was tested using both vocal naming and two different semantic decision tasks (whether or not objects were manufactured, and whether or not they would be found inside the house). Some aspects of the data were inconsistent with contemporary models of object recognition. Specifically, object priming was eliminated with some combinations of prime and test tasks, and there was no evidence of perceptual (as opposed to conceptual or response) priming in either semantic classification task, even though perceptual identification of the objects is required for at least one of these tasks. Experiment 2 showed that even when perceptual demands were increased by brief presentation, the inside task showed no perceptual priming. Experiment 3 showed that the inside task did not appear to be based on conceptual priming either, as it was not primed significantly when the prime decisions were made to object labels. Experiment 4 showed that visual sensitivity could be restored to the inside task following practice on the task, supporting the suggestion that a critical factor is whether the semantic category is preformed or must be computed. The results show that the visual representational processes revealed by object priming depend crucially on the task chosen.     

Do I want to know? How the motivation to acquire relationship-threatening information in groups contributes to paranoid thought,suspicion behavior,and social rejection

We investigated the psychological and social consequences associated with individuals’ motivation to search for information about whether they have been indirectly harmed by members of their group. Consistent with a motivated social cognition perspective, group members who were either chronically (Study 1a) or temporally (Study 1b) high in the motivation to acquire relationship-threatening information (MARTI) made more sinister attributions in ambiguous situations and entertained more paranoid cognitions about their coworkers. Moreover, paranoid cognitions about coworkers mediated the relationship between MARTI and suspicion behaviors toward coworkers (Study 2). Consistent with a social interactionist perspective, others chose to exclude prospective group members who were high in MARTI from joining the group and planned to reject them if they became group members (Study 3). Others’ social rejection of the focal group member was predicted by their anger toward group members who were high in MARTI (Study 4).     

The role of attachment‐related individual differences in goal adoption for serial arguments

This study investigated the relations between attachment‐related individual differences and the adoption of interpersonal goals for conflict in romantic relationships. Additionally, it used the truth and bias model to examine how biased and accurate people are in judging their partner's endorsement of conflict goals, as well as how attachment‐related individual differences moderate this bias and accuracy. Ninety‐four romantic couples completed a measure of attachment‐related individual differences and self ‐ and informant reports of interpersonal conflict goals. Results revealed that individuals endorsed conflict goals consistent with their attachment orientations. Furthermore, they displayed biases when estimating their partner's goals, with some of these biases relating to attachment orientations. These results suggest that attachment‐related individual differences may partially guide conflict‐related goals and partner perceptions.     

The Impact of Siblings During Talent Development: A Longitudinal Examination in Sport

Recent studies have begun to explore the potentially positive impact of siblings on sporting talent development. This study aimed to explore potential mechanisms through which siblings impact on this process. Bimonthly interviews were conducted with 4 families over a 1-year period (parents and siblings; N = 14) during the talent development process. Findings revealed several themes (regularity of interaction, emotional interpersonal skills, rivalry, resilience, and separation) aligning with previous studies, alongside two new themes: communication and skill development. The study's longitudinal nature exposed important differences of potential mechanisms across families, highlighting the complex nature of the sibling relationship.