响应共变性及其注意力调制在感觉皮层和后壁皮层皮层中的不同作用
Yong Jiang1, Sheng He1,2,3, Jiedong Zhang1,3
1State Key Laboratory of Brain and Cognitive Science, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China.
概括
注意力在不同大脑区域不同调节神经反应的共变性. 虽然它增强了早期视觉皮层的信息编码,但这种效果在后壁皮层 (PPC) 缺席.
科学领域:
- 神经科学是一个神经科学.
- 认知神经科学 认知神经科学
- 计算神经科学是一种神经科学.
背景情况:
- 神经反应的共变性对于神经群体的信息编码至关重要.
- 像注意力这样的认知过程可以调节神经共变性,特别是在视觉皮层,以增强信息处理.
研究的目的:
- 调查以注意力驱动的共同可变性调制是否是增强不同大脑区域信息编码的一般机制.
- 检查神经表达性质在确定注意力期间共变性调制的特异性方面的作用.
主要方法:
- 使用超高场磁共振成像 (MRI) 来评估在不同注意力状态下早期视觉皮层和后壁皮层 (PPC) 中的噪声相关性 (共变性测量).
- 与刺激信息编码质量相关的观察到的共变性变化.
主要成果:
- 注意力减少了早期视觉皮层的共变性,改善了刺激编码.
- 在PPC中没有发现通过注意力显著调节共变性,而共变性对信息编码的影响最小.
- 注意力增强了从早期视觉皮层到PPC的信息流,这表明神经表征中的维度减少.
- PPC中的神经活动模式预测了早期视觉皮层共变性的变化,这表明了自上而下的控制.
结论:
- 注意力对共变量的调制是特定区域的,受神经表示的复杂性和忠实性的影响.
- 早期视觉皮层和PPC在注意力调节神经共变性方面发挥着不同的作用.
- 结果表明,在上下注意力控制下,从感觉皮层到PPC的维度减少的等级处理流.
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