Suppr超能文献

低级视觉信息在扫视过程中得以保留,从而实现视觉区域之间扫视后的交接。

Low-Level Visual Information Is Maintained across Saccades, Allowing for a Postsaccadic Handoff between Visual Areas.

作者信息

Fabius Jasper H, Fracasso Alessio, Acunzo David J, Van der Stigchel Stefan, Melcher David

机构信息

Institute of Neuroscience and Psychology, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow G12 8QQ, United Kingdom

Institute of Neuroscience and Psychology, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow G12 8QQ, United Kingdom.

出版信息

J Neurosci. 2020 Dec 2;40(49):9476-9486. doi: 10.1523/JNEUROSCI.1169-20.2020. Epub 2020 Oct 28.

Abstract

Experience seems continuous and detailed despite saccadic eye movements changing retinal input several times per second. There is debate whether neural signals related to updating across saccades contain information about stimulus features, or only location pointers without visual details. We investigated the time course of low-level visual information processing across saccades by decoding the spatial frequency of a stationary stimulus that changed from one visual hemifield to the other because of a horizontal saccadic eye movement. We recorded magnetoencephalography while human subjects (both sexes) monitored the orientation of a grating stimulus, making spatial frequency task irrelevant. Separate trials, in which subjects maintained fixation, were used to train a classifier, whose performance was then tested on saccade trials. Decoding performance showed that spatial frequency information of the presaccadic stimulus remained present for ∼200 ms after the saccade, transcending retinotopic specificity. Postsaccadic information ramped up rapidly after saccade offset. There was an overlap of over 100 ms during which decoding was significant from both presaccadic and postsaccadic processing areas. This suggests that the apparent richness of perception across saccades may be supported by the continuous availability of low-level information with a "soft handoff" of information during the initial processing sweep of the new fixation. Saccades create frequent discontinuities in visual input, yet perception appears stable and continuous. How is this discontinuous input processed resulting in visual stability? Previous studies have focused on presaccadic remapping. Here we examined the time course of processing of low-level visual information (spatial frequency) across saccades with magnetoencephalography. The results suggest that spatial frequency information is not predictively remapped but also is not discarded. Instead, they suggest a soft handoff over time between different visual areas, making this information continuously available across the saccade. Information about the presaccadic stimulus remains available, while the information about the postsaccadic stimulus has also become available. The simultaneous availability of both the presaccadic and postsaccadic information could enable rich and continuous perception across saccades.

摘要

尽管眼球的扫视运动每秒会多次改变视网膜输入,但我们的体验似乎仍是连续且细致的。关于与扫视过程中更新相关的神经信号是否包含刺激特征信息,还是仅包含没有视觉细节的位置指针,目前仍存在争议。我们通过解码一个静止刺激的空间频率来研究扫视过程中低水平视觉信息处理的时间进程,该静止刺激由于水平扫视眼动而从一个视觉半视野切换到另一个视觉半视野。我们在人类受试者(男女皆有)监测光栅刺激的方向时记录脑磁图,使空间频率任务变得无关紧要。在单独的试验中,受试者保持注视,以此来训练一个分类器,然后在扫视试验中测试该分类器的性能。解码性能表明,扫视之后,扫视前刺激的空间频率信息仍会存在约200毫秒,超越了视网膜拓扑特异性。扫视结束后,扫视后的信息迅速增加。在超过100毫秒的时间内存在重叠,在此期间扫视前和扫视后处理区域的解码都是显著的。这表明,扫视过程中感知的明显丰富性可能是由低水平信息的持续可用性所支持的,在新注视的初始处理扫描期间信息会进行“软切换”。扫视会在视觉输入中造成频繁的不连续性,但感知看起来却是稳定且连续的。这种不连续的输入是如何被处理从而实现视觉稳定性的呢?以往的研究集中在扫视前的重新映射上。在这里,我们用脑磁图研究了扫视过程中低水平视觉信息(空间频率)处理的时间进程。结果表明,空间频率信息并非被预测性地重新映射,也没有被丢弃。相反,它们表明随着时间的推移,不同视觉区域之间会进行软切换,使这些信息在扫视过程中持续可用。关于扫视前刺激的信息仍然可用,而关于扫视后刺激的信息也已可用。扫视前和扫视后信息的同时可用性能够实现跨扫视的丰富且连续的感知。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/090c/7724139/f1cb6416ec13/SN-JNSJ200617F001.jpg

文献AI研究员

20分钟写一篇综述,助力文献阅读效率提升50倍。

立即体验

用中文搜PubMed

大模型驱动的PubMed中文搜索引擎

马上搜索

文档翻译

学术文献翻译模型,支持多种主流文档格式。

立即体验