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心理考研笔记6:感觉剥夺-银泉猴实验的启发

  • 2026-10-01 08:32:00
心理考研笔记6:感觉剥夺-银泉猴实验的启发

银泉猴实验

1980年初,爱德华·陶布(Edward Taub)进行了一项实验,这项实验将银泉猴的手指神经根切断,目的是研究感觉丧失之后的康复训练。

而在1982年左右,由于动物保护组织的介入和法律诉讼,这批猴子被扣押,并且在争议中存货了十多年,到了1991年,在这批猴子的最后生命阶段,蒂姆·庞斯对他们的的大脑检测。

检测发现,原来用来处理手指感觉的神经区域,开始对脸部的刺激产生了反应,也就是下脸部和下巴的触觉刺激,能够激活这片皮层。

也就是神经并没有消退,而是重新建立新的连接,并具备功用性。

神经可塑性

这也给了我们很大的启发,也就是,感觉被剥夺,我们的神经可以重塑。

①盲人的听觉会更灵敏,也是因为他们的视觉原本的神经参与了听觉过程,神经被重塑了。科学家使用设备把摄像头图像转成舌头上的电刺激模式,盲人经过训练后能“感知”到物体的形状和位置。



②聋人用触觉“听”:把声音转成振动模式,通过皮肤传递。

大脑不会让某一片神经区域闲置,一旦接收的信号变弱,那么大脑就会用临近的信号来让神经发挥“效用”。

神经可塑性的负面影响

但是这也会引发一些负面的问题。

例如截肢后患者仍能感觉到已失去的肢体在疼痛的现象。

原因是大脑中原本负责该肢体的感觉皮层区域失去了正常输入,被邻近区域(如面部)的神经“接管”了。于是,当面部被触摸时,大脑会误以为是被截肢的手被触摸,从而产生真实的疼痛感。

Pasted image 20260930121249

原因是大脑中原本负责该肢体的感觉皮层区域失去了正常输入,被邻近区域(如面部)的神经“接管”了。于是,当面部被触摸时,大脑会误以为是被截肢的手被触摸,从而产生真实的疼痛感。

例如,听力丧失后,听觉皮层失去了来自耳朵的正常声音输入,那么一样的,临近的区域也会接管这个区域的,所以这个区域出现的异常信号会被大脑误读为声音,从而产生耳鸣。

总结

银泉猴实验证明,被切断手指神经的猴子,原本处理手指的皮层区域在多年后仍能对脸部刺激产生反应,说明神经连接可以重组并保持功能。

也就是大脑具有神经可塑性。

当某片皮层区域失去正常感觉输入时,它不会闲置,而是会被邻近区域“接管”。这既是适应和康复的基础——比如盲人听觉增强、用舌头或皮肤替代视觉和听觉——也可能带来负面后果,比如幻肢痛和耳鸣。

考研心理学习笔记系列内容介绍:

本系列「心理考研学习笔记」的内容将围绕考研的几本书,用简洁的语言记录学习的内容自用,顺便分享出来。

本阶段将包含如下内容:

《普通心理学》彭聘玲对照的知识板块:

一、我们如何认识世界

①感觉

②知觉

③记忆

④思维

二、我们如何行动

⑤情绪

⑥行为

三、智商和人格

⑦智商

⑧人格

如果你也在学习考研知识,都欢迎和我互动,告诉我你的学习到的内容,以及你学习过程中的困惑,让我们一起学习更多,成长更多。

#考研#心理学考研#考研心理学习笔记#考研心理系列#普通心理学

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