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Cross-Modal Multivariate Pattern Analysis
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在IT皮层中感知和记忆代码的时间复杂化
Liang She1, Marcus K Benna2,3, Yuelin Shi4
1Division of Biology and Biological Engineering, Caltech, Pasadena, CA, USA. liangshe@caltech.edu.
Nature
|May 15, 2024
概括
熟悉的面孔的长期记忆被编码在下皮质中, 这种与记忆相关的代码与感官感知代码不同,
科学领域:
- 神经科学
- 认知神经科学
- 系统神经科学
背景情况:
- 长期记忆被认为存储在同一个处理感官信息的大脑区域.
- 下皮层的神经元使用分布式轴代码来表示视觉对象的感知.
- 目前尚不清楚IT皮层是否以及如何代表视觉对象的长期记忆.
研究的目的:
- 研究IT皮层如何在长期记忆中编码熟悉的面孔.
- 在特定的IT面部贴片中比较熟悉与不熟悉的面部的神经表现.
主要方法:
- 检查了IT皮层前部中部 (AM),外皮 (PR) 和极 (TP) 面部部位的熟悉面部的神经编码.
- 分析了对熟悉和不熟悉的面孔的编码轴.
- 通过非活性化PR面部贴片并观察其对AM面部贴片活性的影响来研究PR面部贴片的作用.
主要成果:
- 在AM和PR面部贴片中观察到熟悉面部与不熟悉面部的旋转编码轴.
- 这种与记忆相关的旋转在TP面部贴片中明显较弱.
- 对熟悉与不熟悉的面孔的相对反应大小不是熟悉的可靠指标.
- 关闭PR脸部贴片并没有改变AM脸部贴片中与记忆相关的轴变化动态,这表明内在的IT皮质机制.
结论:
- 熟悉的面孔的记忆在AM和大脑外皮层中被一个独特的长时间神经代码所代表.
- 这种独特的代码解释了相同的神经元群体如何编码人脸的感知和记忆.
- 这些发现挑战了关于记忆表现的先前假设,并突出了IT皮层中神经代码的可塑性.
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