碩士 / 國立交通大學 / 生醫工程研究所 / 99 / Nowadays, the Global Positioning System (GPS) has become an indispensable part for using in human life, which helps to plan the route during the navigations. However, human innate sense of orientation and the spatial ability would be apparent in degradation, thereby brain region would gradually loss of spatial processing functions if they overuse the GPS. Previous studies had observed that two different strategy groups were identified, using an allocentric and egocentric reference frame, during spatial exploration. Neuroimaging by fMRI technique had demonstrated the brain activations were different between the use of an allocentric and egocentric reference frames. A part of the previous studies was experimented in a static environment, but subjects were navigating in the dynamic stimulus environments in real life. Understanding the brain activations in real life applications are still needed furthermore improved.
Therefore, in this study, we have aim to investigate the subject’s cognitive state and their dynamics changes during the spatial navigations. The goals of this study: (1) Investigate the brain dynamics and behavioral performance during navigation in static (motionless) and dynamic (motion) stimulus under the same experiment scene conditions, (2) Correlate with the brain dynamics and the behavioral performance. The experiment was constructed a virtual surrounding scene of 360?a by virtual-reality technology which provided the static stimulus via visual-flow and dynamic stimulus by hydraulic six-axis platform to simulate a more realistic driving environment. For identifying the different strategy groups, it was ease to distinct between the allocerntric and egocentric of subject by using the tunnel scene. There were twelve subjects participated in the experiment and the EEG signals were measured by the standard 64-channel EEG hat. The EEG data were then separated into independent signals by independent component analysis (ICA) decomposition and the use of the event-related disturbance spectrum (ERSP) in the EEG signals changes of frequency domain. Results showed that the correlation between the power increase in alpha band and error homing angle was negative (CC = - 0.9433; p-value < 0.01) in the dynamic stimulus. The power increase of alpha band in parietal region could refer as a basis to score the quality of the brain activations performing in spatial behavioral performance in the future. To summarize, this method proposed in this study complements other existing human brain imaging approaches for the investigation of the coupling between brain activations and sensing the orientation.
| Identifer | oai:union.ndltd.org:TW/099NCTU5810112 |
| Date | January 2011 |
| Creators | 蘇昱駿 |
| Contributors | 林進燈 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 65 |
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