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视觉皮层受体场属性的训练引起的变化:异常视觉训练对受体场属性的影响以及拥挤效应

Maka Malania^1,2, Yih-Shiuan Lin^1,3, Charlotte Hörmandinger^1,4

¹Institute of Psychology, University of Regensburg, Regensburg, Germany.

Journal of vision

|May 21, 2024

概括

异常视觉训练通过减少视觉皮层中的人群受体场 (pRF) 大小来提高拥挤任务的性能,特别是在V2. 这表明大脑可塑性在成年人视觉系统由于实践.

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
认知心理学认知心理学

背景情况:

成年人视觉系统表现出可塑性,但特定训练范式对神经表征的影响仍然是活跃的研究领域.
人口受体场 (pRFs) 是视觉皮层组织和功能的一个关键指标.

研究的目的:

研究视觉拥挤任务上的行为训练如何影响人类视觉皮层中的pRF估计.
探索基础的神经机制实践诱导的改善视觉感知和大脑可塑性.

主要方法:

功能性磁共振成像 (fMRI) 用于测量15名参与者在训练前和训练后的pRF大小.
参与者接受了一项视觉拥挤任务的行为训练,该任务涉及对Landolt C光型进行歧视.
在V1和V2感兴趣区域 (ROI) 估计pRF使用漂移的棋盘条刺激,跨越各种异常度.

主要成果:

训练显著提高了视觉拥挤任务的性能,正如减少拥挤异性质指数所示.
在训练的视网膜位置和附近观察到pRF大小的显著下降.
腹部和背部V2显示出显著的pRF大小减少,特别是在训练过的离心率,而V1显示没有显著的变化.

结论:

对视觉拥挤任务的练习会导致视觉皮层组织的显著变化,特别是在V2中减少pRF大小.
这些发现突出了成年人视觉系统的适应性,并提供了关于学习相关可塑性的神经基础的见解.

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