触摸的空间编码是用内在的,特定于四肢的坐标定义的:EEG研究
Valeria C Peviani1, Hüseyin O Elmas2, W Pieter Medendorp2
1Donders Centre for Cognition, Radboud University, Thomas Van Aquinostraat 4 6525GD Nijmegen, the Netherlands valeria.peviani@donders.ru.nl.
概括
人类大脑使用特定于四肢的内在坐标来确定触摸位置,而不是独立于四肢的外在坐标. 这一发现挑战了长期以来在触觉重新映射中对外部编码的假设.
科学领域:
- 神经科学是一个神经科学.
- 身体感官处理是体感官处理.
- 空间编码 空间编码
背景情况:
- 大脑整合了触觉和自身感知信号,用于空间触觉定位 (触觉重新绘制).
- 现有的理论争论触摸是否被映射成外部 (肢体独立) 或内在 (肢体特定) 坐标.
- 众所周知,灵长类动物的感觉运动和身区域的神经活动通过振幅梯度来编码四肢位置.
研究的目的:
- 调查人类大脑是否使用外部或内在空间编码来进行触觉重新映射.
- 使用脑电图 (EEG) 测试外在与内在编码方案的预测.
主要方法:
- 利用脑电图 (EEG) 和一种新的触觉刺激范式,将手放在各种身体相对位置.
- 对反映肢体位置的幅度梯度分析了体感唤起潜力 (SEP).
- 使用单变量和多变量EEG分析,以及神经网络模型.
主要成果:
- 没有发现任何证据支持触摸位置的外部编码.
- 观察到的神经特征表明了内在的,特定于肢体的空间类型编码.
- 确定了中心-状管道中的早期神经标志物 (约160毫秒),后来转移到大脑的其他区域.
- 一个神经网络模型成功地复制了观察到的梯度模式.
结论:
- 人类大脑通过内在的,特定于肢体的空间代码来定位触摸.
- 这挑战了触觉重绘中外部编码的主导假设.
- 在皮质地图中展示触觉和姿势信息的整合,以实现空间意识.
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