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首页> 外文期刊>The European Journal of Neuroscience >A neural signature of colour and luminance correspondence in bistable apparent motion.
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A neural signature of colour and luminance correspondence in bistable apparent motion.

机译：双稳态视在运动中颜色和亮度对应的神经特征。

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Abstract The 'correspondence problem' refers to the ambiguity of apparent motion (AM) paths if several similar objects are displaced across successive displays. We investigated the effect of intrinsic object properties such as colour and luminance on AM paths, and used functional magnetic resonance imaging to localize neural correlates of correspondence matching in visual cortical regions. Human subjects looked at an AM display where two dots in diagonally opposite corners of an implicit rectangle were flashed in alternation with two dots in the other two corners, yielding spontaneous alternations between horizontal and vertical AM. The dots differed in colour or luminance, or were identical. Neural activity was analysed as a function of whether the perceived AM path matched the dots' colour or luminance, and was also compared to activity during bistable AM displays without correspondence cues. When AM paths matched colour and luminance cues, activity in early visual cortex was the same as during perception of uncued displays, whereas it was suppressed when perceived AM paths violated colour or luminance cues. Colour-sensitive extrastriate cortex (V4 complex) transiently activated whenever AM perception switched from a pattern violating colour correspondence to one consistent with colour. We propose that the neural correlate of correspondence in early visual cortex reflects regulatory mechanisms that flexibly gate early visual feature processing in accord with an overriding perceptual decision. Conversely, activation of feature-selective extrastriate regions depends on the type of cue used for correspondence matching and may reflect the salience of percepts that match in colour and motion.
机译：摘要“对应问题”是指如果在连续显示中放置了多个相似的对象，则视在运动（AM）路径的歧义性。我们调查了固有对象属性（例如颜色和亮度）对AM路径的影响，并使用功能磁共振成像来定位视觉皮层区域中对应匹配的神经相关性。受试者看着AM显示，其中隐式矩形的对角相对角上的两个点交替闪烁，而另两个角上的两个点交替闪烁，从而在水平和垂直AM之间产生自发交替。点的颜色或亮度不同，或者相同。神经活动被分析为感知的AM路径是否匹配点的颜色或亮度的函数，并且还与没有对应提示的双稳态AM显示期间的活动进行了比较。当AM路径匹配颜色和亮度提示时，早期视觉皮层中的活动与未提示显示的感知相同，而当感知到的AM路径违反颜色或亮度提示时，活动被抑制。每当AM感知从违反颜色对应关系的模式切换为与颜色一致的模式时，就会对颜色敏感的外皮层皮质（V4复合体）进行短暂激活。我们提出，早期视觉皮层中对应关系的神经相关性反映了一种调节机制，该机制可以根据最重要的感知决定灵活地控制早期视觉特征处理。相反，特征选择性外条纹区域的激活取决于用于对应匹配的提示的类型，并且可能反映颜色和运动匹配的感知的显着性。

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