University of Aberdeen, UK.
University of Liverpool, UK.
Neuroimage. 2018 Nov 1;181:670-682. doi: 10.1016/j.neuroimage.2018.07.033. Epub 2018 Jul 24.
Feature-based attentional selection of colour is challenging to investigate due to the multidimensional nature of colour-space. When attending concurrently to features from different feature dimensions (e.g. red and horizontal), the attentional selections of the separate dimensions are largely independent. Therefore, if colour constitutes multiple independent feature dimensions for attentional purposes, concurrently attending to two colours should be effective and independent of the specific configuration of target and distractor colours. Here, observers attended concurrently to two out of four fully overlapping random dot kinematograms of different colours, and the allocation of attention to each colour was assessed separately by recordings of steady-state visual evoked potentials. The magnitude of attention effects depended on colour proximity and was well described by a simple model which suggested that colour space is rescaled in an adaptive manner to achieve attentional selection. In conclusion, different spatially overlaid colours can be attended concurrently with an efficiency that is determined by their configuration in colour space, supporting the idea that (at least in terms of hue) colour acts as a single dimension for attentional purposes.
由于颜色空间的多维性质，基于特征的颜色注意选择具有挑战性。当同时注意来自不同特征维度的特征（例如红色和水平方向）时，各个维度的注意力选择在很大程度上是独立的。因此，如果颜色构成了多个独立的注意特征维度，那么同时注意两种颜色应该是有效的，并且与目标和干扰颜色的具体配置无关。在这里，观察者同时注意四个完全重叠的不同颜色的随机点运动图中的两个，并且通过稳态视觉诱发电位的记录分别评估对每种颜色的注意力分配。注意效果的大小取决于颜色的接近程度，可以很好地用一个简单的模型来描述，该模型表明颜色空间以自适应的方式进行重新缩放以实现注意力选择。总之，不同的空间重叠颜色可以以一种由它们在颜色空间中的配置决定的效率同时被注意到，这支持了（至少在色调方面）颜色作为一个单一维度用于注意力目的的观点。
