小柯机器人

美国加州大学圣迭戈分校Satoru K. Miura和Massimo Scanziani合作从视觉皮层中扫视引起的运动中区分出外部因素。这一研究成果于2022年9月14日在线发表在国际学术期刊《自然》上。

研究人员发现在小鼠初级视觉皮层（V1）中，两种类型的运动引起了不同的活动模式。这是因为，在扫视过程中，V1将视觉输入与来自丘脑枕核的强大非视觉输入相结合。非视觉输入触发的反应是特定于扫视方向的，而视觉输入触发的反应是特定于刺激物在视网膜上移动的方向，但这两种反应的首选方向是不相关的。因此，丘脑枕核输入确保了V1对外部和自我产生的运动作出不同的反应。外部感觉信息与身体运动信息的整合可能是感觉皮层区分自我产生的和外部刺激的一般机制。

据悉，区分由环境变化引起的感觉刺激和由动物自身行为引起的感觉刺激是感觉处理的一个标志。扫视是快速的眼球运动，使视网膜上的图像发生移动。视觉系统如何区分由扫视引起的图像运动和环境中的实际运动并不完全清楚。

附：英文原文

Title: Distinguishing externally from saccade-induced motion in visual cortex

Author: Miura, Satoru K., Scanziani, Massimo

Issue&Volume: 2022-09-14

Abstract: Distinguishing sensory stimuli caused by changes in the environment from those caused by an animal’s own actions is a hallmark of sensory processing1. Saccades are rapid eye movements that shift the image on the retina. How visual systems differentiate motion of the image induced by saccades from actual motion in the environment is not fully understood2. Here we discovered that in mouse primary visual cortex (V1) the two types of motion evoke distinct activity patterns. This is because, during saccades, V1 combines the visual input with a strong non-visual input arriving from the thalamic pulvinar nucleus. The non-visual input triggers responses that are specific to the direction of the saccade and the visual input triggers responses that are specific to the direction of the shift of the stimulus on the retina, yet the preferred directions of these two responses are uncorrelated. Thus, the pulvinar input ensures differential V1 responses to external and self-generated motion. Integration of external sensory information with information about body movement may be a general mechanism for sensory cortices to distinguish between self-generated and external stimuli.

DOI: 10.1038/s41586-022-05196-w

Source: https://www.nature.com/articles/s41586-022-05196-w

Nature：《自然》，创刊于1869年。隶属于施普林格·自然出版集团，最新IF：69.504
官方网址：http://www.nature.com/
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