Full text
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| Author(s): |
Natalia Silva Siqueira
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | São Paulo. |
| Institution: | Universidade de São Paulo (USP). Escola de Educação Física e Esportes (EEFE/BT) |
| Defense date: | 2012-03-20 |
| Examining board members: |
Luis Augusto Teixeira;
Ronald Dennis Paul Kenneth Clive Ranvaud;
Sérgio Tosi Rodrigues
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| Advisor: | Luis Augusto Teixeira |
| Abstract | |
The present study aimed to evaluate the effect of uncertainty about direction of target displacement on the visual strategy and motor control in an interception task. Seventeen volunteers participated of Experiment I. They performed interceptive manual movements of a virtual target projected on a LCD screen. The task was performed with a wireless mouse. Participants were submitted to three experimental conditions in two speeds: (1) certainty about unchanged initial target displacement direction, (2) 50% of uncertainty about change of target displacement direction, and (3) certainty about change of initial target displacement direction. Twenty volunteers different from Experiment I participated of Experiment II. Participants performed the same task described in the first experiment. Ten volunteers were assigned to a group which received prior information about the probability of displacement of the target before each condition (INF), and the others were assigned to a group that received no prior information (SI). The groups were evaluated in three conditions: 25%, 50% and 75% of uncertainty about change of target direction. Results of this study revealed that visual behavior is modulated by target speed and uncertainty about the target\'s motion. We also found that prior knowledge about the probability of the target\'s movement influenced the visual strategy used and the performance of the interception. Predictive behaviors were evidenced in both the visual and motor behavior (AU) | |
| FAPESP's process: | 08/08996-0 - Visual Tracking in Interceptative Actions: Effects of Uncertainty and Speed of the Target |
| Grantee: | Natalia Silva Siqueira |
| Support Opportunities: | Scholarships in Brazil - Master |