A continuous semantic space describes the representation of thousands of object and action categories across the human brain.

A continuous semantic space describes the representation of thousands of object and action categories across the human brain.
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一个连续的语义空间描述了整个人大脑中数千个对象和动作类别的表示。

DOI:
10.1016/j.neuron.2012.10.014
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发表时间:
2012-12-20
期刊:
影响因子:
16.2
通讯作者:
Gallant JL
Gallant JL
中科院分区:
医学1区
文献类型:
--
作者:
Huth AG;Nishimoto S;Vu AT;Gallant JL

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人类可以看到和命名数千个不同的物体和动作类别,因此不太可能每个类别都在不同的大脑区域中表示。一个更有效的方案是将类别表示为连续语义空间中的位置,该空间平滑地映射到皮层表面。为了寻找这样一个空间,我们使用功能性磁共振成像(fMRI)来测量自然电影引起的人类大脑活动。然后,我们使用体素明智的模型来检查1705对象和动作类别的皮质表示。通过主成分分析从拟合模型中恢复底层语义空间的前几个维度。恢复的语义空间到皮层平面图的投影显示,语义选择性被组织成平滑的梯度,覆盖了视觉和非视觉皮层。此外,恢复的语义空间和空间的皮层组织在不同的个体之间共享。
Humans can see and name thousands of distinct object and action categories, so it is unlikely that each category is represented in a distinct brain area. A more efficient scheme would be to represent categories as locations in a continuous semantic space mapped smoothly across the cortical surface. To search for such a space, we used functional magnetic resonance imaging (fMRI) to measure human brain activity evoked by natural movies. We then used voxel-wise models to examine the cortical representation of 1705 object and action categories. The first few dimensions of the underlying semantic space were recovered from the fit models by principal components analysis. Projection of the recovered semantic space onto cortical flat maps shows that semantic selectivity is organized into smooth gradients that cover much of visual and non-visual cortex. Furthermore, both the recovered semantic space and the cortical organization of the space are shared across different individuals.
DOI: 10.1038/33402
发表时间: 1998-04-09
期刊: NATURE
影响因子: 64.8
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