Dissociating effects on encoding versus access in visual masking

视觉掩蔽中编码与访问的分离效应

• 批准号: 60167411
• 负责人: Professor Dr. John-Dylan Haynes
• 金额: --
• 依托单位: Berlin Center for Advanced Neuroimaging (BCAN)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2008
• 资助国家: 德国
• 起止时间: 2007-12-31 至 2010-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/60167411?language=en
• 关键词: Dissociating; effects; encoding; versus; access

Two complementary processes play a role in regulating whether a visual stimulus reaches a person's awareness. First, the stimulus has to be encoded in the visual system. Second, the brain has to provide access to a representation of the stimulus in visual cortex. Currently it is unclear which brain processes mediate encoding and access respectively. Importantly, the distinction between representation or encoding and access does not follow a simple distinction between visual and prefrontal cortical regions. This is because visual brain regions take place in regulating access (for example via attentional functions in V4), and prefrontal regions can take part in encoding of stimuli. Here we propose a project that will investigate the cortical mechanisms of encoding and access using an information-theoretic framework based on multivariate decoding in combination with fMRI. We will investigate how graded transitions between visible and invisible stimuli under different forms of masking lead to changes in the encoding of stimulus features in visual brain regions, but also in regions outside the traditional visual system including prefrontal cortex. This will help reveal to which degree brain regions that are modulated by visual awareness are indeed involved in encoding of specific stimulus features.

两个互补的过程在调节视觉刺激是否达到人的意识方面发挥作用。首先，刺激必须在视觉系统中编码。第二，大脑必须在视觉皮层中提供对刺激的表征。目前还不清楚哪些大脑过程分别介导编码和访问。重要的是，表征或编码与获取之间的区别并不遵循视觉和前额叶皮层区域之间的简单区别。这是因为视觉脑区负责调节访问（例如通过V4中的注意力功能），而前额叶区可以参与刺激的编码。在这里，我们提出了一个项目，将调查皮质机制的编码和访问使用信息理论框架的基础上，结合功能磁共振成像多变量解码。我们将研究在不同形式的掩蔽下，可见和不可见刺激之间的分级转换如何导致视觉脑区域中刺激特征编码的变化，以及传统视觉系统以外的区域，包括前额叶皮层。这将有助于揭示受视觉意识调节的大脑区域在多大程度上确实参与了特定刺激特征的编码。

项目成果

Decoding the Contents of Visual Short-Term Memory from Human Visual and Parietal Cortex

• DOI: 10.1523/jneurosci.0184-12.2012
• 发表时间: 2012-09-19
• 期刊: JOURNAL OF NEUROSCIENCE
• 影响因子: 5.3
• 作者: Christophel, Thomas B.;Hebart, Martin N.;Haynes, John-Dylan
• 通讯作者: Haynes, John-Dylan

Changes in functional connectivity support conscious object recognition

• DOI: 10.1016/j.neuroimage.2012.07.056
• 发表时间: 2012-12-01
• 期刊: NEUROIMAGE
• 影响因子: 5.7
• 作者: Imamoglu, Fatma;Kahnt, Thorsten;Haynes, John-Dylan
• 通讯作者: Haynes, John-Dylan

Similar neural mechanisms for perceptual guesses and free decisions

• DOI: 10.1016/j.neuroimage.2012.09.064
• 发表时间: 2013-01-15
• 期刊: NEUROIMAGE
• 影响因子: 5.7
• 作者: Bode, Stefan;Bogler, Carsten;Haynes, John-Dylan
• 通讯作者: Haynes, John-Dylan

The neural encoding of guesses in the human brain

• DOI: 10.1016/j.neuroimage.2011.08.106
• 发表时间: 2012-01-16
• 期刊: NEUROIMAGE
• 影响因子: 5.7
• 作者: Bode, Stefan;Bogler, Carsten;Haynes, John-Dylan
• 通讯作者: Haynes, John-Dylan

Human visual and parietal cortex encode visual choices independent of motor plans

• DOI: 10.1016/j.neuroimage.2012.08.027
• 发表时间: 2012-11-15
• 期刊: NEUROIMAGE
• 影响因子: 5.7
• 作者: Hebart, Martin N.;Donner, Tobias H.;Haynes, John-Dylan
• 通讯作者: Haynes, John-Dylan