McDonald James S, Mannion Damien J, Goddard Erin, Clifford Colin W G
School of Psychology, University of New South Wales, Sydney, NSW, Australia.
J Vis. 2010 Oct 29;10(12):34. doi: 10.1167/10.12.34.
We used functional magnetic resonance imaging (fMRI) at 3T in human participants to trace the chromatic selectivity of orientation processing through functionally defined regions of visual cortex. Our aim was to identify mechanisms that respond to chromatically defined orientation and to establish whether they are tuned specifically to color or operate in an essentially cue-invariant manner. Using an annular test region surrounded inside and out by an inducing stimulus, we found evidence of sensitivity to orientation defined by red-green (L-M) or blue-yellow (S-cone isolating) chromatic modulations across retinotopic visual cortex and of joint selectivity for color and orientation. The likely mechanisms underlying this selectivity are discussed in terms of orientation-specific lateral interactions and spatial summation within the receptive field.
我们在3T条件下对人类受试者使用功能磁共振成像（fMRI），以通过视觉皮层的功能定义区域追踪方向处理的颜色选择性。我们的目的是确定对颜色定义的方向做出反应的机制，并确定它们是专门针对颜色进行调谐，还是以基本不依赖线索的方式运作。使用一个由诱导刺激内外包围的环形测试区域，我们发现了在视网膜拓扑视觉皮层中对由红-绿（L-M）或蓝-黄（S-锥体分离）颜色调制定义的方向敏感的证据，以及对颜色和方向的联合选择性。从感受野内方向特异性的侧向相互作用和空间总和的角度讨论了这种选择性的潜在机制。
