关于"皮层中单个试验尖列车显示决策过程中的离散步骤"的评论
Michael N Shadlen1, Roozbeh Kiani2, William T Newsome3
1Howard Hughes Medical Institute (HHMI) and Department of Neuroscience, Columbia University, New York, NY, USA. shadlen@columbia.edu.
概括
在感知决策过程中, 围膜神经元不会分离开来. 证据积累模型比离散步骤模型更好地解释神经发射率的变化.
科学领域:
- 神经科学
- 认知神经科学
- 如何做出决定
背景情况:
- 感知决策的形成涉及大脑中的神经处理.
- 之前的研究表明神经元在决策过程中表现出离散的发射速度.
- 另类模型建议循序渐进的证据积累反映在神经活动中.
研究的目的:
- 重新评估神经元中的离散发射速度步骤模型.
- 比较离散步骤模型与证据积累模型的解释能力.
- 挑战知觉决策形成的离散步骤模型的假设.
主要方法:
- 对表层神经元活动的现有神经生理学数据的分析.
- 通过计算模型模拟神经发射模式.
- 模型预测与实证观测的比较.
主要成果:
- 拉蒂默等人提出的离散步骤模型. 基于没有证据的假设.
- 证据积累模型为观察到的神经数据提供了更有效的解释.
- 周围神经元的发射速度更好地表现为渐进的变化而不是离散的步骤.
结论:
- 目前的数据不支持对神经元的离散发射速度步骤的说法.
- 逐渐积累的证据是形成感知决策的更合理的机制.
- 现有数据可以通过积累模型更好地解释,挑战离散步骤假设.
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