神经模型跨感官视觉唤起磁脑摄影响应在听觉皮层的神经模型
Kaisu Lankinen1,2, Jyrki Ahveninen3,2, Mainak Jas3,2
1Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Charlestown, Massachusetts 02129 klankinen@mgh.harvard.edu.
概括
交感视觉输入影响听觉皮层活动. 研究人员使用磁脑图 (MEG) 和人类神经皮层神经溶解器 (HNN) 建模,发现视觉刺激在听觉皮层中引起反 (FB) 反应,与直接听觉刺激不同.
科学领域:
- 神经科学是一个神经科学.
- 听觉感知是一种听觉感知.
- 跨模式可塑性 跨模式可塑性
背景情况:
- 听觉皮层活动是由视觉输入调节的,这表明交叉感官相互作用.
- 以前的非人类灵长类动物研究表明,在听觉皮层中进行前 (FF) 听觉和反 (FB) 视觉处理.
研究的目的:
- 调查人类听觉皮层中交叉感官视觉唤起的活动是否通过反 (FB) 输入进行中介.
- 为了区分听觉和视觉刺激的输入途径进入人类听觉皮层.
主要方法:
- 磁脑电图 (MEG) 记录了八名暴露于听觉和视觉刺激的人类受试者的大脑活动.
- 人类神经皮层神经溶解器 (HNN) 模拟了前 (FF) 和反 (FB) 连接,以解释MEG源波形.
- 分析的重点是感兴趣的听觉皮层区域,检查响应延迟和输入特征.
主要成果:
- 听觉皮层中听觉唤起的反应在37 ms和90 ms的峰值,与FF相一致,其次是FB输入.
- 在听觉皮层中,视觉唤起的反应在125毫秒处呈现顶峰,仅由FB输入充分解释.
- HNN 建模支持了一个假设,即视觉输入到听觉皮层的视觉输入主要是 FB 类型.
结论:
- 这项研究提供了证据,表明交叉感官视觉输入到人类听觉皮层是由反途径介导的.
- 研究结果强调了结合MEG和计算建模 (HNN) 的实用性,以了解皮层处理和层次组织.
- 动态MEG源活动模式可以揭示输入的性质和皮层区域之间的信息的层次流.
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