Medicine and Health Sciences Commons^™

The Purposeful Use Of An Object In The Development Of Skill With A Prosthesis, Hon Keung Yuen

Masters Theses

Theoretically, perceptual information from the interaction with an object and its surfaces (an affordance) facilitates the development of motor skill. This study investigated the use of an affordance in learning control of flexion and extension of an above-elbow training prosthesis. Fifty-two male college students were randomly assigned to two training procedures: two, 1.5-minute periods of a joining dots activity with a flashlight attached to the hook of the prosthesis (affordance group), and practice moving the prosthesis at the elbow joint (no-affordance group) for the same amount of time. To assess generalization of skill to a different task, each subject traced …

Muscle Stress And The Use Of Body Mechanics, Kathleen Ann Keeler

Masters Theses

The purpose of this study was to examine the amount of lower back muscle stress produced during lifting tasks, using variations in weight and postures. Electromyographic activity of the erector spinae muscles at the L4-5 vertebral level was measured.

Thirty healthy female subjects participated in the study. Each subject lifted loads of two given weights using both the stooped and squat lifting postures. Electromyographic activity was recorded and averaged throughout each lift.

Results indicated that increased weight resulted in increased stress on the erector spinae muscles, regardless of posture. The squat lifting posture was found to be more stressful on …

The Effects Of Group Incentive Plans On Individual Performance, Karen Geralyn Stoneman

Masters Theses

A simulated work environment was utilized to study the effects of group incentive plans on individual performance on an assembly task. The subjects in the study were college students who worked in groups of a small size, a medium size, or a large size. A reversal design was utilized in which the first condition was an individual incentive condition, the second was a group incentive condition, and the final was the return to an individual incentive condition.

The results showed: (a) individual performance did not significantly change when individuals were switched from an individual to a group incentive plan; (b) …