It has been shown that there exists a relationship between levels of metacognitive ability and estimation of personal ability for largely verbally-based tasks, where those with lessened facility for the task tend toward overestimation of their aptitude relative to their peers (Kruger and Dunning, 1999). This study examines this effect for a task of mechanical ability for volunteer participants (n = 69), where participants were given an abbreviated form of the Bennett Mechanical Comprehension Test (BMCT) to establish a level of competency. Following the administration of the BMCT, the participants were then asked to speculate on the hypothetical grade for their performance, as well as the relationship between their hypothetical grade, and the grades of others. Participants then "tutored" a hypothetical student on the solution to one of the problems found on the BMCT, and their explanations were coded for degree of bias towards confirmation versus disconfirmation that was utilized in the problem solving. It was found that females' basic ability had a greater range than males', and females on the high and low ends of competency made greater use of confirming strategies in their problem solving. This is indicative of the overall observed interaction effect between Gender, Perceived Relative Competence, and Actual Competence observed in this study.

Walking outdoors requires one to deal with a wide range of visual and cognitive perturbations, i.e., multiple object tracking and making timely decisions while ignoring irrelevant information, etc. Using dual-task gait paradigm, the purpose of this thesis was to evaluate the age effects of different types of visuospatial cognitive tasks, i.e. designed cognitive game tasks and commercial computer games on gait and cognitive performances in older adults as compared to the younger adults. A standardized dual-task assessment approach, i.e. objectively evaluating both gait and cognitive performances simultaneously, has potential to be the screening tool to detect gait and cognitive impairments in early stages. Further, evaluating the training value of commercial computer games by comparing them with the designed cognitive games with objective outcome measures will help in developing multimodal dual-task intervention platform to treat and prevent age-related physical and cognitive impairments. / October 2016