在10周的基于点击的回声定位训练后,盲人和有视力的成年人初级视觉和听觉皮层的变化
Liam J Norman1, Tom Hartley2, Lore Thaler1
1Department of Psychology, Durham University, Durham, DH1 3LE, UK.
Cerebral cortex (New York, N.Y. : 1991)
|June 19, 2024
概括
神经可塑性使成年大脑能够适应感官处理. 这项研究表明,盲人和有视力的人在回声定位训练后表现出类似的大脑变化,这表明神经重组的共同原则.
科学领域:
- 神经科学是一个神经科学.
- 感官处理 感官处理
- 神经可塑性 神经可塑性
背景情况:
- 成年人的大脑在感官处理方面表现出显著的适应能力.
- 讨论神经可塑性的结构性约束,特别是对感官剥夺的反应.
- 感官皮层中模式特定组织与跨模式可塑性的作用是一个活跃的研究领域.
研究的目的:
- 调查与盲人和有视力的回声定位训练相关的功能和结构性大脑变化.
- 探索训练诱导的神经可塑性是否在不同的感官体验中遵循类似的原则.
- 研究结构"蓝图"对感官处理中的神经可塑性的影响.
主要方法:
- 一个为期10周的回声定位培训计划给了12名盲人和14名有视力的参与者.
- 在预后设计中使用磁共振成像 (MRI) 来评估大脑功能和结构的变化.
- 分析的重点是响应听觉刺激的激活模式和灰质密度的变化,包括回声.
主要成果:
- 盲人和有视力的参与者在训练后回应回声时,视觉皮层 (V1) 的激活增加.
- 对于一般的声音,在两个组中都观察到听觉皮层 (A1) 的激活增加.
- 盲人参与者在右A1显示灰色物质密度增加,而有视力的参与者则显示相邻声学区域的密度增加.
结论:
- 响应回声定位训练的功能重组似乎在盲人和有视力的个体中遵循类似的原则.
- 随着功能重组而发生的结构变化在盲人和有视力的群体之间有所不同,这表明经验和大脑结构之间存在微妙的相互作用.
- 这些发现挑战了感官皮层严格的模式特定组织,并突出了可适应的跨模式可塑性.
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