...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Neurophysiology >Different spatial frequency bands selectively signal for natural image statistics in the early visual system
【24h】

Different spatial frequency bands selectively signal for natural image statistics in the early visual system

机译：不同的空间频段选择性地发信号，用于早期视觉系统中的自然图像统计

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Early visual evoked potentials (VEPs) measured in humans have recently been observed to be modulated by the image statistics of natural scene imagery. Specifically, the early VEP is dominated by a strong positivity when participants view minimally complex natural scene imagery, with the magnitude of that component being modulated by luminance contrast differences across spatial frequency (i.e., the slope of the amplitude spectrum). For scenes high in structural complexity, the early VEP is dominated by a prominent negativity that exhibits little dependency on luminance contrast. However, since natural scene imagery is broad band in terms of spatial frequency, it is not known whether the above-mentioned modulation results from a complex interaction within or between the early neural processes tuned to different bands of spatial frequency. Here, we sought to address this question by measuring early VEPs (specifically, the Cl, PI, and Nl components) while human participants viewed natural scene imagery that was filtered to contain specific bands of spatial frequency information. The results show that the Cl component is largely unmodulated by the luminance statistics of natural scene imagery (being only measurable when such stimuli were made to contain high spatial frequencies). The PI and Nl, on the other hand, were observed to exhibit strong spatial frequency-dependent modulation to the luminance statistics of natural scene imagery. The results therefore suggest that the dependency of early VEPs on natural image statistics results from an interaction between the early neural processes tuned to different bands of spatial frequency.
机译：最近被观察到在人类中测量的早期视觉诱发电位（VEPS）被自然场景图像的图像统计调制。具体地，当参与者观看最小复杂的自然场景图像时，VEP早期通过强大的阳性支配，该组件的幅度由空间频率（即幅度频谱的斜率）的亮度对比差异调制。对于结构性复杂性高的场景，VEP早期以突出的消极为主，呈现较少依赖亮度对比度。然而，由于自然场景图像在空间频率方面是宽带，因此尚不知道上述调制是由早期神经过程内或之间调谐到不同空间频带的不同频带之间的复杂相互作用。在这里，我们试图通过测量早期的VEPS（具体地，CL，PI和NL组件）来解决这个问题，而人类参与者观察被过滤以包含特定空间频率信息的特定条带的自然场景图像。结果表明，CL组分主要由自然场景图像的亮度统计而言，（仅当使得这种刺激含有高空间频率时是可测量的）。另一方面，PI和NL被观察到对自然场景图像的亮度统计表现出强烈的空间频率依赖性调制。因此，结果表明，早期VEPS对自然图像统计的依赖性来自调谐到不同空间频带的早期神经过程之间的相互作用。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号