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.

使用74通道SQUID系统（Magnes SQUID D1 TM SQUID 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评估。获得了以下结果：1.在MEG分析中，在7 Hz的频率下，左中中央区的谱密度增加在对气味的反应中比在对空气刺激的反应中显着更大。这种对气味反应的更大增加显然与嗅觉系统的主要中心眶额区的气味感知机制的存在有关。增加和减少频谱面积在8赫兹的频率观察到在右半球时，没有刺激相比，空气和气味相比，没有刺激。这些变化可能反映了刺激引起的高度警惕。当没有刺激与空气刺激相比，在11 Hz的频率下，注意到一个显着的频谱增加。在11和12 Hz的频率下观察到类似的趋势时，没有刺激相比，气味。这些发现增加了注意力水平，以响应随机呈现的气味和空气.在21和22赫兹的频率显着差异，注意到在对侧半球时，没有刺激与空气相比，没有刺激与气味相比。这些差异显然引起了躯体感觉皮层对空气和气味的反应。当无刺激与空气相比，无刺激与气味相比时，注意到左半球在14至17 Hz和23至14 Hz频率处的MEG谱密度的交替。这些结果似乎与空气和气味引起的愉快和不愉快的“情绪”有关。