Context-Dependent Modulation of Early Visual Cortical Responses to Numerical and Nonnumerical Magnitudes
Context-Dependent Modulation of Early Visual Cortical Responses to Numerical and Nonnumerical Magnitudes
复制标题
早期视觉皮层对数值和非数值幅度反应的上下文相关调节
DOI：
10.1162/jocn_a_01774
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发表时间：
2021
影响因子：
3.2
通讯作者：
Brannon, Elizabeth M.
中科院分区：
文献类型：
--
作者：
Park, Joonkoo;Godbole, Sonia;Woldorff, Marty G.;Brannon, Elizabeth M.
大脑是否以及如何编码离散的数字大小与连续的非数字大小存在激烈的争论。在之前的一系列研究中，我们对点阵列的数值(数值)和非数值(大小和间距)维度进行了正交变化，并证明了数值而不是非数值维度对早期视觉诱发电位(VEP)的强烈调制。尽管人们对大脑对点阵列连续维度的系统性变化的反应知之甚少，但一些作者直觉地认为，视觉处理流对连续的大小信息肯定比对数字更敏感。为了解决这种可能性，我们测量了观看点阵的参与者的VEP，这些点阵在保持数量不变的情况下，一次只在一个非数字量级维度(大小或间距)上发生变化，并将其与保持大小和间距不变的数量变化的情况进行比较。我们发现可靠但微小的神经对大小和间距的独占性改变的敏感性；然而，独占性地改变个数引起了对VEP的更强健的调制。结合以前的工作，这些发现表明，早期视觉皮质对大小维度的敏感性与环境有关：当数字保持不变时，大脑对大小和间距的变化中等敏感，但当数字同时变化时，对这些连续变量的敏感性降低到可以忽略不计的水平。在神经元归一化的框架内，对数值和非数值大小的编码和上下文相关性提出了神经生理学解释。
Whether and how the brain encodes discrete numerical magnitude differently from continuous nonnumerical magnitude is hotly debated. In a previous set of studies, we orthogonally varied numerical (numerosity) and nonnumerical (size and spacing) dimensions of dot arrays and demonstrated a strong modulation of early visual evoked potentials (VEPs) by numerosity and not by nonnumerical dimensions. Although very little is known about the brain's response to systematic changes in continuous dimensions of a dot array, some authors intuit that the visual processing stream must be more sensitive to continuous magnitude information than to numerosity. To address this possibility, we measured VEPs of participants viewing dot arrays that changed exclusively in one nonnumerical magnitude dimension at a time (size or spacing) while holding numerosity constant and compared this to a condition where numerosity was changed while holding size and spacing constant. We found reliable but small neural sensitivity to exclusive changes in size and spacing; however, exclusively changing numerosity elicited a much more robust modulation of the VEPs. Together with previous work, these findings suggest that sensitivity to magnitude dimensions in early visual cortex is context dependent: The brain is moderately sensitive to changes in size and spacing when numerosity is held constant, but sensitivity to these continuous variables diminishes to a negligible level when numerosity is allowed to vary at the same time. Neurophysiological explanations for the encoding and context dependency of numerical and nonnumerical magnitudes are proposed within the framework of neuronal normalization.
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影响因子：
2.5
作者：
Cavanaugh, JR;Bair, W;Movshon, JA
通讯作者：
Movshon, JA
DOI：
10.1073/pnas.96.21.12073
发表时间：
1999-10-12
影响因子：
11.1
作者：
Kapadia, MK;Westheimer, G;Gilbert, CD
通讯作者：
Gilbert, CD
影响因子：
3.2
作者：
Fornaciai, Michele;Park, Joonkoo
通讯作者：
Park, Joonkoo
影响因子：
29.3
作者：
Barlow, H
通讯作者：
Barlow, H