Magnetoencephalographic Responses to Odor and Air by Fast Fourier Transformation Analysis in Human

通过快速傅立叶变换分析人体对气味和空气的脑磁响应

• 批准号: 10671627
• 负责人: KATO Toshihiko
• 金额: $ 1.86万
• 依托单位: Fukuoka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10671627/
• 关键词: Magnetoencephalography; Odor; Fast Fourier transformation; Human

Magnetoencephalographic (MEG) responses to odor (amyl-acetate) and air stimuli for 1 second were recorded in humans with a 74-chennel SQUID system (MagnesィイD1TMィエD1, Bti Co.) and evaluated by fast Fourier transformation analysis. The following were obtained :1. On MEG analysis, the spectral density increase in the left mid-central region at a frequency of 7 Hz was significantly greater in response to odor than in response to air stimuli. This greater increase in response to odor is apparently related to the presence of the odor perception mechanism in the orbital frontal area, a major center of the olfactory system.2. Both increased and decreased spectral areas at a frequency of 8 Hz were observed over the right hemisphere when no stimulus was compared with air and no stimulus was compared with odor. The changes may reflect a high level of vigilance caused by stimulation.3. When no stimulus was compared with air stimulation, a significant spectral increase at a frequency of 11 Hz was noted. Similar trends were observed at frequencies of 11 and 12 Hz when no stimulus was compared with odor. These findings an increased level of attention in response to random presentation of odor and air.4. Significant differences at frequencies of 21 and 22 Hz were noted in the contralateral hemisphere when no stimulus was compared with air and no stimulus was compared with odor. These differences apparently arise the responses of the somato-sensory cortex to air and odor.5. Alternation of MEG spectral densities at frequencies from 14 to 17 Hz and from 23 to 14 Hz in the left hemisphere was noted when no stimulus was compared with air and no stimulus was compared with odor. These results appear to be related to the "emotions" of pleasantness and unpleasantness evoked by air and odor.

用74通道鱿鱼系统(MagnesィイD1TMィエD1，Bti Co.)记录人类对气味(乙酸戊酯)和空气刺激1秒的脑磁图(MEG)反应。并通过快速傅立叶变换分析进行了评估。结果如下：1.在脑磁图分析中，左侧中中央区7赫兹频率处对气味的反应明显大于对空气刺激的反应。这种对气味反应的较大增加显然与嗅觉系统的主要中枢--眼眶额区的气味感知机制的存在有关。当无刺激与空气、无刺激与气味相比较时，右侧大脑半球在8赫兹频率下的光谱面积增加和减少。这些变化可能反映了刺激引起的高度警惕。当无刺激时与空气刺激相比，在11赫兹的频率处有显著的频谱增加。当没有刺激物与气味进行比较时，在11和12赫兹的频率下也观察到了类似的趋势。这些发现增加了人们对气味和空气随机呈现的关注水平。当无刺激与空气、无刺激与气味比较时，对侧大脑半球在21和22赫兹的频率上有显著差异。这些差异明显引起了躯体感觉皮层对空气和气味的反应。当无刺激与空气、无刺激与气味比较时，左侧大脑半球14~17赫兹和23~14赫兹频率的脑磁图密度交替变化。这些结果似乎与空气和气味引起的愉悦和不愉快的“情绪”有关。