博士 / 國立交通大學 / 資訊科學與工程研究所 / 104 / Studies on spatial navigation reliably demonstrate that the retrosplenial complex (RSC) is crucial for allocentric information process for a translation function by transform egocentric spatial information into allocentric spatial reference frames (SRF) and vice versa. However, most of these studies are imaging studies. High temporal resolution measures such as electroencephalography (EEG) are missing. Besides, the interaction between RSC and other brain cortex for spatial navigation remains unclear. Thus, this study investigated the function of the RSC in spatial navigation with high temporal resolution and causal relation between RSC and other regions of navigational network.
High-resolution EEG signals were recorded during a path integration task to analyze spectral perturbations during navigation based on allocentric and egocentric SRF. EEG signals were decomposed by independent component analysis (ICA) and subsequently time-frequency transformation to investigate the EEG modulation for reference frame-specific orientation processes. Granger causality flows between brain sources was measured using direct short-time directed transfer function (sdDTF). Our results showed that navigation involved areas including the parietal, motor, and occipital cortices with dominant perturbations in the alpha band and theta modulation in frontal cortex. Causal connectivity was found between the anterior cingulate cortex and left prefrontal cortex in theta band and between the motor, parietal and occipital cortices and RSC in alpha band. Egocentric navigation revealed stronger theta increased in the prefrontal cortex. In contrast, allocentric navigation engaged an occipital-pareitao-RSC alpha network. The RSC revealed strongest causal flow during orientation changes. Moreover, allocentric participants revealed
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performance-related alpha desynchronization and synchronization in the 12-14 Hz band in the RSC.
The results support the role of RSC for translating egocentric spatial information into allocentric reference frames. The results also suggest RSC directly provides information on heading changes in humans.
| Identifer | oai:union.ndltd.org:TW/104NCTU5394035 |
| Date | January 2015 |
| Creators | Chiu, Te-Cheng, 邱德正 |
| Contributors | Lin, Chin-Teng, 林進燈 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | en_US |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 82 |
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