Romkema, S. (Sietske) (2009) Influence of Optical Acceleration on Initiation Times in Catching Fly Balls. thesis, Human Movement Sciences.
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Abstract
A specifying variable that indicates the relation between optical information and movement can contribute to the search for the use of direct perception. In catching fly balls optical acceleration (OA), as described by Chapman (1968), is seen as a possible specifying variable. Apart from that it is possible to make a distinction between acceleration and deceleration, the use of OA is not proven. It is unclear what variable and what corresponding threshold value is used and therefore it is necessary to analyze a pattern in OA. This study was designed to show the use of OA by comparing this pattern in OA with the pattern in initiation times. The first experiment was found to be necessary to improve the experimental setup for catching in the virtual environment. In the second experiment, a qualitative comparison of the patterns largely agreed for balls landing in front. This especially counted for trajectories were the change in OA was based on the height of the ball trajectory. During the experiments, participants had the tendency to move backwards regardless of the landing location of the ball. This caused such a distortion in the initiation times for the balls landing behind, that these initiation times became useless for the qualitative comparison. Thus, in the qualitative comparison of the second experiment the use of OA as a specifying variable, in catching fly balls that landed in front, seems to be present.
| Item Type: | Thesis (Thesis) |
|---|---|
| Supervisor name: | Zaal, Dr. ir. F.T.J.M. |
| Supervisor name: | Bootsma, Prof. dr. R.J. and Fernandez, Dr. L. and Universite de Ia Mediterranee, Marseille |
| Faculty: | Medical Sciences |
| Date Deposited: | 25 Jun 2020 10:49 |
| Last Modified: | 25 Jun 2020 10:49 |
| URI: | https://umcg.studenttheses.ub.rug.nl/id/eprint/1049 |
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