Motor-unit Coherence During Isometric Contractions Is Greater in a Hand Muscle of Older Adults

The purpose of this study was to quantify the strength of motor-unit coherence from the first dorsal interosseus muscle in young and old adults using data obtained in a previous study, where no differences in motor-unit synchronization between the two groups were observed.

One hand clapping: the phoneme and the nothing

In Écrits, Lacan proposes an “unthinkable list” of objects (a) that includes “the phoneme, the gaze, the voice – the nothing”. While the gaze and the voice have received extensive critical commentary, the phoneme and the nothing have gone practically unnoticed. I propose to theoretically construct the object (a) by means of an explication of Lacan’s enigmatic allusion to the phoneme and the nothing. I contend that the phoneme is the “ur-form” of the object (a), whose ontological status is nothing. As the ur-form of the object (a) (both structurally and genetically), the phoneme exemplifies the primary function of the structural causality of the Lacanian Real within the Symbolic Order, namely, the function of the bar resisting signification between signifier and signified. By developing the concept of the object (a) in relation to linguistics, psychoanalysis can reply to the persistent misunderstanding of Lacan’s position by deconstructive critics, such as Judith Butler.

Motor unit synchronization measured by cross-correlation is not influenced by short-term strength training of a hand muscle

The purpose of the study was to quantify the strength of motor unit synchronization and coherence from pairs of concurrently active motor units before and after short-term (4–8 weeks) strength training of the left first dorsal interosseous (FDI) muscle. Five subjects (age 24.8 ± 4.3 years) performed a training protocol three times/week that consisted of six sets of ten maximal isometric index finger abductions, whereas three subjects (age 27.3 ± 6.7 years) acted as controls. Motor unit activity was recorded from pairs of intramuscular electrodes in the FDI muscle with two separate motor unit recording sessions obtained before and after strength training (trained group) or after 4 weeks of normal daily activities that did not involve training (control group). The training intervention resulted in a 54% (45.2 ± 8.3 to 69.5 ± 13.8 N, P = 0.001) increase in maximal index finger abduction force, whereas there was no change in strength in the control group. A total of 163 motor unit pairs (198 single motor units) were examined in both subject groups, with 52 motor unit pairs obtained from 10 recording sessions before training and 51 motor unit pairs from 10 recording sessions after training. Using the cross-correlation procedure, there was no change in the strength of motor unit synchronization following strength training (common input strength index; 0.71 ± 0.41 to 0.67 ± 0.43 pulses/s). Furthermore, motor unit coherence z scores at low (0–10 Hz; 3.9 ± 0.3 before to 4.4 ± 0.4 after) or high (10–30 Hz; 1.7 ± 0.1 before to 1.9 ± 0.1 after) frequencies were not influenced by strength training. These motor unit data indicate that increases in strength following several weeks of training a hand muscle are not accompanied by changes in motor unit synchronization or coherence, suggesting that these features of correlated motor unit activity are not important in the expression of muscle strength.

A `Rubber-hand` illusion reveals a relationship between perceptual body image and unhealthy body change

The ‘rubber-hand’ illusion, in which individuals misattribute tactile sensations felt by their hand to a rubber prosthetic hand that they see being stimulated, was employed to examine the relationship between perceptual body image and unhealthy body change in 128 volunteers. Variance in unhealthy body development in males (22%) and in bulimic symptomatology in both females and males (10%), was explained by susceptibility to the illusion. The illusion, which is relatively free from cognitive and emotional ‘contamination’, could be used to identify individuals most responsive to therapies designed to correct inaccurate body perceptions–individuals whose perceptual body image is malleable.

Second life first hand: a teacher perspective

The professional landscape in public relations is changing as new communication and social networking technologies are integrated into day-to-day professional practice. Whilst adoption of such technologies by public relations practitioners is certainly on the increase, their use can still be regarded as limited and application experimental to some degree. However, few could argue that these technologies will be increasingly important to public relations practice in coming years.
In this context, public relations educators must strive to deliver a contemporary curriculum reflective of industry expectations and best practice principles but which also provides students with exposure to new communication contexts and technologies.

The advent of persistent virtual worlds generated by Massively Multiplayer Online Role Playing Games (MMORPGs) and Collaborative Virtual Environments (CVEs) offer new realms for public relations practitioners and educators alike. Virtual worlds potentially provide public relations educators with novel but relevant training grounds for their students. These 3D worlds offer dynamic and authentic learning environments which have the capability to foster deep learning and engender a sense of community within a student cohort in a way that many computer-mediated classrooms sadly lack.

This paper will present the experiences of two tertiary educators’ journey towards a conceptual understanding of the persistent virtual world, Second Life, from a teacher perspective. The paper argues that the successful adoption of new online technologies like Second Life need not be inhibited by preferences for technology or prior ICT skills as long as teaching staff are given the necessary support and training by their institutions coupled with opportunity for familiarisation and experimentation.

Evaluation of the Chinese version of the disability of the arm, shoulder and hand (DASH-HKPWH): cross-cultural adaptation process, internal consistency and reliability study

Abstract
The Disability of the Arm, Shoulder and Hand (DASH) was translated into Chinese by a physiotherapy team of the Prince of Wales Hospital, Hong Kong (DASH-HKPWH).

Objectives
This study evaluated the cross-cultural adaptation process, face validity, internal consistency and reliability of the DASH-HKPWH.

Method
Language officers and medical professionals from different fields were invited to translate and evaluate the face validity of the DASH-HKPWH. 88 patients were recruited to complete two DASH questionnaires on two occasions 1-2 weeks apart.

Results
Some adjustments were made to the translations based on the cultural and linguistic practice in Hong Kong. The face validity was satisfactory with a mean endorsement score of 3.2. The difference between the mean of DASH scores was not significant (t = −0.35, p = 0.73). The ICC (1,1) and Cronbach's alpha for the 30-item Disability/Symptom of the DASH-HKPWH was 0.77 and 0.94, respectively.

Conclusion
The translation was valid and reliable and acceptably equivalent to the original version. The questionnaire is suitable for measuring changes experienced by patients with any upper extremity disorders.

Construct validity of the Chinese version of the disability of the arm, shoulder and hand questionnaire (DASH-HKPWH)

The study evaluated the construct validity of the Chinese Hong Kong version of the disabilities of the arm, shoulder and hand questionnaire (DASH-HKPWH). Three hundred and thirty four patients with a broad range of upper extremity disorders were recruited into the study. Each completed DASH-HKPWH and SF-36 forms and their pain intensity (numeric pain rating scale) and grip strength were also measured. The mean DASH-HKPWH score was 40 (SD = 20). Principal component factor analysis identified a single factor, which accounted for 47% of the total variance. Pearson correlation was applied to assess convergent and divergent validity of the DASH-HKPWH by comparison with the above-mentioned subjective and objective measurements. Our findings were comparable to the DASH of other languages

Artificial hand - from a robotic perspective

The human hand provides proof that the anthropomorphic configuration, properly controlled, is successful and gives a target to aim at for artificial hand/robot hand researchers. In this paper we discuss the human hand physiology and grasp capabilities. We then provide design on a double thumb, two finger robotic hand. Architecture of the hand, fingers and their dynamic modelling is discussed. Finally, results are reported on the performance of a finger in the hand.