UNLABELLED Grip strength dynamometers often are used to assess hand function in children. The use of normative grip strength data at followup is difficult because of the influence of growth and neuromuscular maturation. As an alternative, infant welfare centers throughout the world use growth diagrams to observe normative growth. The aim of this study was to develop similar growth diagrams for ...

The concepts of "good" and "bad" are associated with right and left space. Individuals tend to associate good things with the side of their dominant hand, where they experience greater motor fluency, and bad things with their nondominant side. This mapping has been shown to be flexible: Changing the relative fluency of the hands, or even observing a change in someone else's motor fluency, resul...

OBJECTIVE To observe the real-time muscle activity of bilateral hands while subjects draw circles under 2 conditions: with and without using Ramachandran's mirror-box. SUBJECTS A total of 24 healthy volunteers. METHODS Subjects drew 4 circles sequentially using their dominant hand with the other hand at rest, both with and without looking at a mirror image. Circles were marked by 8 dots on ...

Claims that time has a special role in the control of writing and the specific claim that writing time is absolutely invariant across changes in writing size are evaluated in two experiments. The first examined writing time for 24 undergraduate subjects who produced the string eyleyl with the dominant hand or arm in blocked repetitions having different vertical size targets. These variations pr...

Some neurodegenerative diseases, such as amyotrophic lateral sclerosis (ALS) and Parkinson’s disease (PD), characteristically present with asymmetrical symptoms, and previous studies have shown that there is concordance for side of onset and handedness. 2 Separately, the markedly higher incidence of ALS has been reported in athletes, particularly in professional soccer players in Italy, and Ame...