Poster Session II: SSVEP measurements of color and spatial frequency response in V1
Poster Session II: SSVEP measurements of color and spatial frequency response in V1
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海报会议 II：V1 中颜色和空间频率响应的 SSVEP 测量
DOI：
10.1167/jov.23.15.50
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发表时间：
2023
影响因子：
1.8
通讯作者：
Carter A
中科院分区：
文献类型：
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作者：
Carter A
简介：我们团队最近的工作(Segala等人，eLife，2023)表明，双目亮度信号组合的规则取决于空间频率(SF)。结构化模式显示出强烈的眼间抑制，而非结构化输入(平均场盘)则不显示。在这里，我们使用SSVEP来询问SF依赖是否也存在于颜色通路中。方法使用规范的V1模板记录12名受试者的SSVEP(Poncet&Ales，2023)。使用快门护目镜瞄准眼睛，刺激是5赫兹(左眼)和7赫兹(右眼)的对比度反转光栅或圆盘。实验因素包括刺激SF(盘、栅1cpd)、色度(Lms、LM或S视锥隔离)和眼球(左、右或两者)。在双眼条件下，所有的2F反应都表现出抑制，并且存在显著的互调(IM)项(输入的总和和差异-例如，2赫兹)。在双目条件下，抑制和IM的大小取决于SF和色度；在亮度条件下，栅格的IM幅度高于圆盘，但在色度条件下，圆盘的IM幅度高于栅格。总体而言，我们发现所有刺激组合的光谱响应特征有显着差异。结论所有输入在V1中都经历了双眼组合，但控制组合的规则似乎取决于色度和SF。
Intro: Recent work from our group (Segala et al, eLife, 2023) shows that the rules for binocular luminance signal combination depend on spatial frequency (SF). Structured patterns show strong interocular suppression while unstructured inputs (mean field disks) do not. Here, we used SSVEPs to ask if SF dependence is also found in chromatic pathways.MethodsSSVEPs were recorded from 12 subjects using a canonical V1 template (Poncet & Ales, 2023). Eyes were targeted using shutter goggles and stimuli were contrast-reversing gratings or disks at 5Hz (left eye) and 7Hz (right eye). Experimental factors were stimulus SF (disk, grating 1cpd), chromaticity (LMS, LM or S-cone isolating) and ocularity (left, right or both).ResultsMonocular conditions generated large responses at 2F. In binocular conditions, all 2F responses showed suppression, and significant intermodulation (IM) terms (sums and differences of the inputs-eg, 2Hz) were present. The magnitude of both suppression and IM in the binocular condition depended on SF and chromaticity; IM amplitudes were higher for gratings compared to disks in the luminance condition, but higher for disks compared to gratings in the chromatic conditions. Overall we found significant differences in the spectral response signatures across all stimulus combinations.ConclusionAll inputs undergo binocular combination in V1 but the rules governing the combination appear to depend on both chromaticity and SF.