Feature representation under crowding in macaque V1 and V4 neuronal populations.
Feature representation under crowding in macaque V1 and V4 neuronal populations.
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DOI：
10.1016/j.cub.2022.10.049
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发表时间：
2022-12-05
期刊：
影响因子：
9.2
通讯作者：
Kohn, Adam
中科院分区：
文献类型：
--
作者：
Henry, Christopher A.;Kohn, Adam
视觉感知强烈依赖于空间背景。一个深刻的例子是视觉拥挤，即附近刺激的存在损害了物体特征的可辨别性。尽管大量的工作知觉拥挤和视觉皮层神经元的空间整合特性，这两个方面的视觉处理之间的联系仍然不清楚。为了更好地理解拥挤的神经基础，我们同时记录了注视猕猴V1和V4的神经元群。我们评估的信息可从测量的反应的方向的视觉目标，无论是在隔离和干扰中提出的目标。当干扰物存在时，单神经元和群体反应对目标定向的信息都较少。V1中的信息丢失为中度，V4中的信息丢失更严重。信息损失可以追溯到系统的分裂和添加剂的变化，神经元调谐。调谐的加法和乘法变化在V4中更严重;此外，调谐表现出在V4中更大的其他非仿射变换，进一步限制了固定感官读出策略跨显示器提取准确特征信息的能力。我们的结果提供了对视觉层次不同阶段拥挤效应的直接测试。他们揭示了拥挤的视觉环境如何改变皮层群体的尖峰活动，并将这些变化与神经元空间整合的既定机制联系起来。亨利和科恩研究了视觉拥挤如何损害猕猴V1和V4神经元群体的目标方向编码。分心刺激诱导系统的加法和乘法的变化，调整，导致中度信息损失的目标辨别力在V1和更大的损失在V4。
Visual perception depends strongly on spatial context. A profound example is visual crowding, whereby the presence of nearby stimuli impairs discriminability of object features. Despite extensive work on perceptual crowding and the spatial integrative properties of visual cortical neurons, the link between these two aspects of visual processing remains unclear. To understand better the neural basis of crowding, we recorded simultaneously from neuronal populations in V1 and V4 of fixating macaque monkeys. We assessed the information available from the measured responses about the orientation of a visual target, both for targets presented in isolation and amid distractors. Both single neuron and population responses had less information about target orientation when distractors were present. Information loss was moderate in V1 and more substantial in V4. Information loss could be traced to systematic divisive and additive changes in neuronal tuning. Additive and multiplicative changes in tuning were more severe in V4; in addition, tuning exhibited other, non-affine transformations that were greater in V4, further restricting the ability of a fixed sensory readout strategy to extract accurate feature information across displays. Our results provide a direct test of crowding effects at different stages of the visual hierarchy. They reveal how crowded visual environments alter the spiking activity of cortical populations by which sensory stimuli are encoded and connect these changes to established mechanisms of neuronal spatial integration. Henry and Kohn investigate how visual crowding impairs the encoding of target orientation in macaque V1 and V4 neuronal populations. Distractor stimuli induce systematic additive and multiplicative changes in tuning, leading to moderate information loss for target discriminability in V1 and more substantial loss in V4.
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