Item – Theses Canada

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OCLC number
806535478
Link(s) to full text
LAC copy
LAC copy
Author
Martell, Stephen Glenn.
Title
The optimal quiet eye period and the regulation of visual information in complex aiming.
Degree
Ph. D. -- University of Calgary, 2010
Publisher
Ottawa : Library and Archives Canada = Bibliothèque et Archives Canada, [2011]
Description
2 microfiches
Notes
Includes bibliographical references.
Abstract
The current study attempted to determine whether a predictive, prospective, or a combined predictive-prospective control strategy best describes complex-aiming accuracy in a basketball jump shot. In Experiment 1, the coupled gaze and motor behaviour of elite basketball players were analyzed as they took jump shots from behind the free throw line. Results indicated an earlier occurring, longer QE period in hits as opposed to misses, thereby supporting predictive control. However, the significant effect between QE duration before and after extension phase onset, provided evidence that some late information may have been used in combination with early information, thereby supporting combined-control. In Experiment 2, the availability of early target information was reduced using three spatial occlusion conditions. Accuracy appeared to be dependent more upon a predictive control strategy as evident by a lower frequency of fixations, earlier QE onset, and longer QE duration. The majority of the QE period was contained within the flexion phase and the amount of late information garnered past the extension phase onset did not seem to assist in achieving success, thereby suggesting the dominant role of predictive control. In Experiment 3, participants were required to perform jump shots under similar conditions to Experiment 2. However, before beginning to shoot their attention was drawn to an egocentric orientation using a questioning technique. Results indicated that athletes increased their accuracy in Experiment 3 due to significant changes in QE onset, duration, and offset. Overall, the results from the three experiments showed that accuracy in the jump shot was characterized by an early onset and longer duration of the QE period, thereby supporting predictive control.
ISBN
9780494694923
0494694920