意识报告的门:视觉和额叶皮层的信号损失和响应偏差
Bram van Vugt1, Bruno Dagnino1, Devavrat Vartak1
1Department of Vision and Cognition, Netherlands Institute for Neuroscience, Meibergdreef 47, 1105 BA Amsterdam, Netherlands. p.roelfsema@nin.knaw.nl houman_safaai@hms.harvard.edu.
概括
视觉刺激的意识检测取决于持续的额叶皮层活动. 在视觉路径上的信息处理失败, 与 prestimulus 脑状态相关, 决定刺激是否达到意识.
科学领域:
- 神经科学
- 认知神经科学
- 视觉感知
背景情况:
- 了解意识感知的神经基础是神经科学的一个关键挑战.
- 在认知研究中区分有意识感知和潜意识的刺激是非常重要的.
研究的目的:
- 调查神经机制的基础意识检测的弱视觉刺激.
- 识别涉及将感官输入转化为意识体验的皮质区域和过程.
主要方法:
- 在清醒的子的视觉和额叶皮层的电生理记录.
- 需要报告刺激存在的行为任务.
- 视觉区域V1的微刺激以探测信息的传播.
- 对大脑活动及其与感知相关性的分析.
主要成果:
- 有意识地报告的刺激显示出强烈,持续的额叶皮质活动,与未报告的刺激相比,活动较弱,衰减.
- 从视觉到额叶皮层的信息丢失发生在连续阶段,通过V1微刺激证实.
- 预刺激大脑状态影响了对相同刺激的反应偏差和敏感性.
结论:
- 对视觉刺激的意识与皮质上层区域,特别是额叶皮质的持续神经活动有关.
- 神经信息处理和传播的故障决定了意识的检测.
- 在高皮层区域的非线性"点火"过程可能是刺激报告能力的基础,由 prestimulus 神经状态调节.
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