外层活动反映出局部视网膜输入的缺失
Poutasi W B Urale1, Lydia Zhu1, Roberta Gough1
1School of Optometry & Vision Science, University of Auckland, New Zealand.
Consciousness and cognition
|August 28, 2023
概括
生理盲点的感知填充可能不是一个活跃的大脑过程. 相反,在更高的处理阶段的视觉系统集成可能会忽略缺失的视网膜输入,这表明填充是不必要的.
科学领域:
- 神经科学是一个神经科学.
- 视觉感知 视觉感知 视觉感知
- 认知科学 认知科学
背景情况:
- 生理盲点或光盘缺乏光感受器,但感知似乎填补了这种视觉空白.
- 现有的理论争论这种填充是否是一种活跃的感知过程,还是神经处理的工件.
研究的目的:
- 为了研究底层的神经机制的感知填充生理盲点.
- 为了确定填充是否是一个活跃的过程,还是更高层次的视觉集成的结果.
主要方法:
- 功能性脑成像 (fMRI) 用于绘制人类视觉皮层中盲点的视网膜图像.
- 在对盲点的感知过程中,在早期视觉区域和更高的外层区域测量了神经反应.
主要成果:
- 早期的视觉区域显示出与盲点缺少视网膜输入相一致的反应.
- 较高的外层区域表现出独立于填充现象本身的反应.
- 这些更高层次的反应反映了刺激眼睛在盲点眼睛上的视觉输入.
结论:
- 这些发现表明,感知填充不是一个活跃的过程,而是视觉输入集成在高层大脑区域的结果.
- 这挑战了对盲点调用特定"填充"机制的必要性.
- 结果与哲学观点一致,这些观点质疑需要积极填充解释的必要性.
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