Bimanual movement is integral to daily function. As such, it is important to understand factors that influence bimanual performance. Playing the piano was employed to examine bimanual movement. Additionally, the weather prediction task was administered as a measure of non-declarative learning. Sex influenced motor performance. Males tended to perform asymmetrical movements with less skill than females. Age affected motor performance. Older adults were less proficient, but improved similarly with practice as young adults. Further, older adults exhibited differential deterioration of bimanual movement. Feedback and music training affected motor performance. Females performed bimanual movement less proficiently with auditory feedback. Individuals with music training performed bimanual movements relative to unimanual movements better with feedback. Music training moderated age-related differential deterioration of bimanual movements. Older adults performed significantly worse than young adults on the weather prediction task. In addition, the weather prediction task correlated with motor measures in a sample including older adults. / xii, 159 leaves : ill. ; 29 cm

The purpose of this thesis was to investigate manual asymmetries in the reach-to-grasp movement based on two hypotheses: 1) manual asymmetries are resultant from asymmetries in the dorsal vision-for-action system; and 2) manual asymmetries are contingent on task difficulty. Participants grasped glasses of water under different visual-feedback conditions. Demand was manipulated by varying the level of the water contained in the glass. Hand asymmetries of the reach-to-grasp movement were studied through kinematic analyses. Visual feedback availability and task demand affected all kinematic measures. Manual asymmetries were found in peak velocity, movement time, and variability of maximum grip aperture. Consistent with reach-to-point literature, reach-to-grasp actions were faster and more accurate when performed with the right hand and when guided by the dorsal vision-for-action system. The results of the thesis provide support for a theory of left-hemisphere specialization for the visual control of actions. / xiv, 121 leaves : ill. ; 29 cm

M.A. / The aim of the study was to investigate whether evoked potential distinguishes between motor coordinated and-uncoordinated African children. Because the brain functions as a unified entity and different brain systems are integrated simultaneously, it was postulated that there is a relationship between the auditory evoked potential of the brain stem on the one hand and motor coordination on the other hand, that is, the sensory and the motor systems are related. Sensory- motor activity is thus perceived to form a unified function within the total framework of human functioning. The relevant literature points to a possible relationship between the auditory evoked potential of the brain stem and motor coordination. Patients with degenerative diseases such as Parkinson's disease and multiple sclerosis exhibit abnormal evoked potential responses as well as unusual motor behaviour and coordination. Similarly, children with hearing problems also show unusual evoked potential responses of the brain stem as well as motor lethargy(delayed motor responses) and clumsiness. As a result of these tendencies it was postulated that evoked potential would be able to distinguish between motor-coordinated and -uncoordinated subjects. The brain's evoked potential response is a robust phenomenon that provides a record of electrical brain activity, even in trials where overt responses are not usually expected. The present study focuses on the auditory evoked potential of the brain stem (AEP). The evoked potential serves as a measure of the sensory transmission of information in the brain and consequently highlights the neural activity underlying normal sensory experiences. The subjects selected for the study were 46 eight- to twelve-year-old African children attending a farm school. They can be regarded as representative of the population of eight- to twelve-year old African farm children. All the subjects were administered the Quick Neurological Screening Test in order to catagorise them into two groups, namely the motor-coordinated group and the motor-uncoordinated group. Thereafter the auditory evoked potential of the brain stem was recorded from all the subjects in both groups ...