Ho Tiffany C, Brown Scott, Abuyo Newton A, Ku Eun-Hae J, Serences John T
Department of Psychology, University of California, San Diego, La Jolla, CA, USA.
J Vis. 2012 Aug 24;12(8):15. doi: 10.1167/12.8.15.
Feature-based attention has been shown to enhance the responses of neurons tuned to an attended feature while simultaneously suppressing responses of neurons tuned to unattended features. However, the influence of these suppressive neuronal-level modulations on perception is not well understood. Here, we investigated the perceptual consequences of feature-based attention by having subjects judge which of four random dot patterns (RDPs) contained a motion signal (Experiment 1) or which of four RDPs contained the most salient nonrandom motion signal (Experiment 2). Subjects viewed pre-cues which validly, invalidly, or neutrally cued the direction of the target RDP. Behavioral data were fit using the linear ballistic accumulator (LBA) model; the model design that best described the data revealed that the rate of sensory evidence accumulation (drift rate) was highest on valid trials and systematically decreased until the cued direction and the target direction were orthogonal. These results demonstrate behavioral correlates of both feature-based attentional enhancement and suppression.
基于特征的注意力已被证明能够增强调谐到被关注特征的神经元的反应，同时抑制调谐到未被关注特征的神经元的反应。然而，这些抑制性神经元水平调制对感知的影响尚未得到很好的理解。在此，我们通过让受试者判断四个随机点图案（RDP）中哪一个包含运动信号（实验1），或者四个RDP中哪一个包含最显著的非随机运动信号（实验2），来研究基于特征的注意力对感知的影响。受试者观看预线索，这些线索有效、无效或中性地提示目标RDP的方向。行为数据使用线性弹道累加器（LBA）模型进行拟合；最能描述数据的模型设计表明，感觉证据积累率（漂移率）在有效试验中最高，并系统地下降，直到提示方向与目标方向正交。这些结果证明了基于特征的注意力增强和抑制的行为相关性。
