Manual asymmetries in the preparation and control of goal-directed movements

The primary purpose of this experiment was to determine if left hand reaction time advantages in manual aiming result from a right hemisphere attentional advantage or an early right hemisphere role in movement preparation. Right-handed participants were required to either make rapid goal-directed movements to small targets or simply lift their hand upon target illumination. The amount of advance information about the target for a particular trial was manipulated by precuing a subset of potential targets prior to the reaction time interval. When participants were required to make aiming movements to targets in left space, the left hand enjoyed a reaction advantage that was not present for aiming in right space or simple finger lifts. This advantage was independent of the amount or type of advance information provided by the precue. This finding supports the movement planning hypothesis. With respect to movement execution, participants completed their aiming movements more quickly when aiming with their right hand, particularly in right space. This right hand advantage in right space was due to the time required to decelerate the movement and to make feedback-based adjustments late in the movement trajectory.     

Confucius and Kierkegaard: A Compatibilist Account of Social Ontology,Acquired Selfhood,and the Sources of Normativity

Nearly all of the scant comparative work on Søren Kierkegaard and Confucius places the two starkly at odds with each other. Kierkegaard is pictured as the paradigmatic exemplar of the Western self: a discrete rights-bearing and volitional atom who is quite alone in the world, while Confucius, by contrast, is the paradigmatic exemplar of the Eastern self: a complex and irreducibly embedded communitarian bundle of relations and rich social roles. In this article, I challenge this oppositional approach, since it is both erroneous and obscures fruitful dialogue between the two on conceptually commensurate problems. I argue (1) that Kierkegaard offers a relational ontology of the self which moves in a Confucian direction, (2) that subjectivity and relational reciprocity are not fundamentally at odds in the two thinkers, (3) that both thinkers value a life of harmonious integration that entails right relation to others, and finally (4) that Confucius’ appeal to Heaven as a source of normativity allows for salutary social critique of prevailing ethical norms and practices, in a way that provides important comparative insights with Kierkegaardian theism.     

Should I use a computer-assisted career guidance system? It depends on where your career decision-making difficulties lie

The present study examined the pattern of career decision-making difficulties encountered by 417 young adults who used one or more of the computer-assisted career guidance systems (CACGSs) available at one of the Israeli Veteran Administration's counselling centres, and assessed the effectiveness of these CACGSs in reducing their career decision-making difficulties. Career decision-making difficulties were found to be highest for individuals who were prior to the pre-screening stage of the career decision-making process and lowest for those who were at the choice stage. The reduction in difficulties after using the CACGSs was statistically significant in seven of the 10 difficulty categories examined: an especially marked reduction was found for difficulties related to lack of information. No such reduction was observed for difficulties related to external conflicts. Participants' perception of having been assisted through the dialogue with the CACGSs was highest for individuals who used all three systems, and lowest for those who accessed only one of the three CACGSs.     

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.