Sheth Bhavin R, Shimojo Shinsuke
Department of Electrical and Computer Engineering, University of Houston, Houston, TX 77204-4005, USA.
J Vis. 2008 Mar 27;8(3):29.1-10. doi: 10.1167/8.3.29.
We report a new type of orientation-contingent color aftereffect in which the color aftereffect is opposite to the classical McCollough effect, i.e., the perceived color of the aftereffect is the same as the inducer's color. Interleaved exposure to red, horizontal and achromatic (gray), horizontal gratings led to a long-lasting aftereffect in which achromatic horizontal gratings appeared reddish. The effect, termed the anti-McCollough effect, although weaker than the classical aftereffect, remained stable for a moderate duration of time (24 hours). Unlike the classical aftereffect, which is known to not transfer interocularly, the new after-aftereffect transferred 100%, suggesting that its locus in the brain was downstream of the classical effect. It is likely that neurons in a higher-order area adapted to the classical color aftereffect that was represented in a lower-order area, thus forming an aftereffect of an aftereffect, i.e., an after-aftereffect. Our finding has implications as to how neural activity in lower- and higher-level areas in the brain interacts to yield conscious visual experience.
我们报告了一种新型的方向依赖性颜色后效，其中颜色后效与经典的麦卡洛效应相反，即后效的感知颜色与诱导刺激的颜色相同。交替暴露于红色水平光栅和消色差（灰色）水平光栅会导致一种持久的后效，即消色差水平光栅呈现出微红色。这种效应被称为反麦卡洛效应，尽管比经典后效弱，但在一段适度的时间（24小时）内保持稳定。与已知不会在两眼间转移的经典后效不同，这种新的后后效100%发生了转移，这表明它在大脑中的位置位于经典效应的下游。很可能是高阶区域的神经元适应了低阶区域所呈现的经典颜色后效，从而形成了一种后效的后效，即后后效。我们的发现对于大脑中低阶和高阶区域的神经活动如何相互作用以产生有意识的视觉体验具有启示意义。
