Browsing by Subject "Tracking task"
Now showing 1 - 3 of 3
Results Per Page
Sort Options
Item Effects of age and arthritis, and cognitive and physical demand, on performance on a continuous tracking task using knee flexions and extensions(Texas Tech University, 2006-05) Williamson, Elizabeth Mae; Marshall, Philip H.; Durso, Francis T.; Stickley, Lois A.; Bleckley, M. KathrynThe purpose of this study was to establish if older individuals' poorer performance on a motor task using the knee is due to physical (velocity of movement) or cognitive (compatibility of target and subject movement) factors, and to establish if peripheral sensorimotor damage caused by osteoarthritis leads to further deterioration of motor performance. Participants were 24 healthy younger adults, 24 older adults without osteoarthritis, and 22 older adults with osteoarthritis of the knee. Customized software (Advanced Motion Technology, Phoenix, AZ) generated a moving, on-screen sine wave and disc. Participants were instructed to keep the disc on the sine wave by extending and flexing the knee. Compatibility was affected by having leg movements and on screen disc movement be in the same or different directions. Participants completed 10 trials in each of these conditions, which were crossed with both slow and fast movements of the sine wave target across the screen. Overall, younger subjects performed better than older adults and older adults without osteoarthritis performed better than older adults with osteoarthritis. Age-related changes in motor performance were found to be due to both physical and cognitive manipulations and in some comparisons osteoarthritis heightened the effects.Item Effects of age and arthritis, and cognitive and physical demand, on performance on a continuous tracking task using knee flexions and extensions(2006-05) Williamson, Elizabeth Mae; Marshall, Philip H.; Bleckley, M. Kathryn; Durso, Francis T.; Stickley, Lois A.The purpose of this study was to establish if older individuals' poorer performance on a motor task using the knee is due to physical (velocity of movement) or cognitive (compatibility of target and subject movement) factors, and to establish if peripheral sensorimotor damage caused by osteoarthritis leads to further deterioration of motor performance. Participants were 24 healthy younger adults, 24 older adults without osteoarthritis, and 22 older adults with osteoarthritis of the knee. Customized software (Advanced Motion Technology, Phoenix, AZ) generated a moving, on-screen sine wave and disc. Participants were instructed to keep the disc on the sine wave by extending and flexing the knee. Compatibility was affected by having leg movements and on screen disc movement be in the same or different directions. Participants completed 10 trials in each of these conditions, which were crossed with both slow and fast movements of the sine wave target across the screen. Overall, younger subjects performed better than older adults and older adults without osteoarthritis performed better than older adults with osteoarthritis. Age-related changes in motor performance were found to be due to both physical and cognitive manipulations and in some comparisons osteoarthritis heightened the effects.Item Static and dynamic performance during precision fine motor tracking(2013-05) Gottlich, Samantha; Abraham, Lawrence D.Studies of static and dynamic motor control have a long research history. In most cases, studies have focused on one condition or the other. However, it is important to determine whether differences exist between the two types of task, especially when used in conjunction with task performance. Video game controllers, motorized wheel chairs, steering wheels, and robotic surgical equipment are all examples of how modern equipment uses static and dynamic motor control to achieve task performance goals. To this end, this study aimed to examine possible differences in accuracy or consistency of performance between static and dynamic variations of a precision fine motor tracking task. Nineteen healthy, right-handed volunteer participants were asked to manipulate a cursor to track a moving target with both index fingers, using a static control method in one task and a dynamic control method in another task. The cursor was to follow as closely as possible a target traveling along a diagonal line and back. The control methods were tested during two different testing sessions to reduce confounding of the task conditions. After 50 practice trials in a condition, 5 test trials were recorded. Two dependent variables, RMSE and CVE, were used to represent task performance as indicators of accuracy and consistency, respectively. Analyses of variance with a Latin Square design were used to compare overall performance of each dependent variable between the two conditions. Results showed a significant difference in both variables with p-values less than .001; tracking accuracy was better on the static task and cursor motion consistency was better on the dynamic task. These findings suggest that performance aspects of a fine motor control task does vary with control method and can be used to aid equipment design and task performance in the future.