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| 題名: | Hippocampal involvement in processing of indistinct visual motion stimuli |
| 作者: | 段正仁;Fraedrich, Eva M.;Flanagin, Virginia L.;Duann, Jeng-Ren;Brandt, Thomas;Glasauer, Stefan |
| 貢獻者: | 生醫理工學院認知神經科學研究所 |
| 關鍵詞: | Adult;Brain;Cognitive Neuroscience;Female;Hippocampus - physiology;Humans;Information processing;Magnetic Resonance Imaging - methods;Male;Memory;Motion Perception - physiology;NMR;Nuclear magnetic resonance;Photic Stimulation - methods;Psychomotor Performance - physiology;Reaction Time - physiology;Visual task performance;Young Adult |
| 日期: | 2012-06-01 |
| 上傳時間: | 2026-04-23 14:27:31 (UTC+8) |
| 出版者: | One Rogers Street, Cambridge, MA 02142-1209, USA: MIT Press - Journals |
| 摘要: | 摘要： AbstractPerception of known patterns results from the interaction of current sensory input with existing internal representations. It is unclear how perceptual and mnemonic processes interact when visual input is dynamic and structured such that it does not allow immediate recognition of obvious objects and forms. In an fMRI experiment, meaningful visual motion stimuli depicting movement through a virtual tunnel and indistinct, meaningless visual motion stimuli, achieved through phase scrambling of the same stimuli, were presented while participants performed an optic flow task. We found that our indistinct visual motion stimuli evoked hippocampal activation, whereas the corresponding meaningful stimuli did not. Using independent component analysis, we were able to demonstrate a functional connectivity between the hippocampus and early visual areas, with increased activity for indistinct stimuli. In a second experiment, we used the same stimuli to test whether our results depended on the participants' task. We found task-independent bilateral hippocampal activation in response to indistinct motion stimuli. For both experiments, psychophysiological interaction analysis revealed a coupling from posterior hippocampus to dorsal visuospatial and ventral visual object processing areas when viewing indistinct stimuli. These results indicate a close functional link between stimulus-dependent perceptual and mnemonic processes. The observed pattern of hippocampal functional connectivity, in the absence of an explicit memory task, suggests that cortical–hippocampal networks are recruited when visual stimuli are temporally uncertain and do not immediately reveal a clear meaning.
其他題名： J Cogn Neurosci
出版者： One Rogers Street, Cambridge, MA 02142-1209, USA: MIT Press - Journals
出版日期： 2012-06-01
出處： Journal of Cognitive Neuroscience, 2012-06, Vol.24 (6), p.1344-1357
資源來源： Academic Search Premier (Ebsco)
版權： Copyright MIT Press Journals Jun 2012
識別號： ISSN: 0898-929X
識別號： ISSN: 1530-8898
識別號： EISSN: 1530-8898
識別號： DOI: 10.1162/jocn_a_00226
識別號： PMID: 22524276 |
| 顯示於類別: | [認知與神經科學研究所 ] 期刊論文
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