|Ph.D Student||Yechiam Eldad|
|Subject||A Strategy Based Model to the Interpretation of Visual|
Dominance in Perceptual-Motor Tasks
|Department||Department of Industrial Engineering and Management||Supervisor||Professor Emeritus Daniel Gopher|
The acquisition of competence in the performance of perceptual-motor skills can be viewed as a process of converging choices among performance strategies, based on task constraints and reinforcement structure. The present study investigated this approach in the context of the competition between visually guided response strategies, and response strategies guided by other sensory modalities. Visually guided response modes are known to be dominant in perceptual motor tasks. In three different tasks we studied the effect on skill acquisition of the following three factors: available strategies, inherent efficiency, and acquired efficiency. The three tasks were manual gear shifting in car driving, standard typing, and number processing with a keypad. In all three tasks, visually guided response modes were initially the dominant response strategy. This dominance was attributed to a locally optimal strategic choice, determined by the initial propensity of vision and prior experience. Indirect training methods that modified the priority and reinforcement structure of the task promoted the development of alternative strategies, that do not rely on the visual modality. These strategies lead to better overall performance levels, when training is terminated and the task returns back to its standard, pretraining condition. The strategy-based approach provides new insights into the sources of performance deficits in skilled performance and the way to eliminate them with training.