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首页> 外文期刊>Journal of Neurophysiology >Magnetic and electrical responses of the human brain to texture-defined form and to textons.
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Magnetic and electrical responses of the human brain to texture-defined form and to textons.

机译：人脑对纹理定义的形式和纹理的电磁反应。

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摘要

1. We searched for a neurophysical correlate of preattentive texture discrimination by recording magnetic and electric evoked responses from the human brain during the first few hundred milliseconds following the presentation of texture-defined (TD) checkerboard form. The only two textons that changed when the TD checkerboard appeared or disappeared were the local orientation and line termination textons. (Textons are conspicuous local features within a texture pattern). 2. Our evidence that the magnetic response to TD form cannot be explained in terms of responses to the two associated textons is as follows: 1) by dissociating the two responses we showed that the magnetic response to TD form is almost entirely independent of the magnetic response to the local orientation texton; 2) a further distinction between the two responses is that their distributions over the head are different; and 3) the magnetic response to TD form differs from the magnetic response to the line termination texton in both distribution over the head and waveform. We conclude that this evidence identifies the existence of a brain response correlate of preattentive texture discrimination. 3. We also recorded brain responses to luminance-defined (LD) checkerboard form. Our grounds for concluding that magnetic brain responses to the onset of checkerboard form are generated by different and independent neural systems for TD and LD form are as follows: 1) magnetic responses to the onset of TD form and LD form had different distributions over the skull, had different waveforms, and depended differently on check size; and 2) the waveform of the response to superimposed TD and LD checks closely approximated the linear sum of responses to TD checks and LD checks alone. 4. One possible explanation for the observed differences between the magnetic and electric evoked responses is that responses to both onset and offset of TD form predominantly involve neurons aligned parallel to the skull, whereas that is not the case for responses to LD form.
机译：1.我们通过记录呈现纹理定义（TD）棋盘格形式后的最初几百毫秒内人脑的磁和电诱发反应来搜索注意力不集中的纹理识别的神经物理相关性。当TD棋盘出现或消失时，仅有的两个更改的局部文字是局部方向和线条终止文字。 （纹理是纹理图案中明显的局部特征）。 2.我们无法用对两个相关的质子的响应来解释对TD形式的磁响应的证据如下：1）通过分离两个响应，我们表明对TD形式的磁响应几乎完全独立于磁回应当地取向的教科书; 2）两个响应之间的进一步区别是它们在头部的分布不同; 3）对TD形式的磁响应在磁头上的分布和波形上都不同于对线路终端的弹性响应。我们得出的结论是，该证据确定了注意力集中的纹理识别与大脑反应相关。 3.我们还记录了大脑对亮度定义（LD）棋盘格形式的反应。我们得出的结论是，对TD和LD形式的脑部反应是由不同的独立神经系统产生的，如下所示：1）对TD和LD形式的脑部反应的磁响应在颅骨上有不同的分布，具有不同的波形，并且对支票大小的依赖不同; 2）对TD和LD叠加检查的响应波形非常接近单独对TD和LD检查的响应的线性总和。 4.对于磁诱发反应和电诱发反应之间观察到的差异的一种可能解释是，对TD形式的发作和偏移的反应主要涉及平行于颅骨排列的神经元，而对LD形式的反应并非如此。

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