Vision Sciences Laboratory, School of Health Sciences, University of Iceland, Reykjavik, Iceland.
Department of Psychology, University of New Hampshire, Durham, NH, USA.
J Vis. 2023 May 2;23(5):21. doi: 10.1167/jov.23.5.21.
Recent work indicates that visual features are processed in a serially dependent manner: The decision about a stimulus feature in the present is influenced by the features of stimuli seen in the past, leading to serial dependence. It remains unclear, however, under which conditions serial dependence is influenced by secondary features of the stimulus. Here, we investigate whether the color of a stimulus influences serial dependence in an orientation adjustment task. Observers viewed a sequence of oriented stimuli that randomly changed color (red or green) and reproduced the orientation of the last stimulus in the sequence. In addition, they had to either detect a certain color in the stimulus (Experiment 1) or discriminate the color of the stimulus (Experiment 2). We found that color does not influence serial dependence for orientation, and that observers were biased by previous orientations independently of changes or repetitions in the stimulus color. This occurred even when observers were explicitly asked to discriminate the stimuli based on their color. Together, our two experiments indicate that when the task involves a single elementary feature such as orientation, serial dependence is not modulated by changes in other features of the stimulus.
最近的研究表明，视觉特征是以串行依赖的方式进行处理的：当前刺激特征的决策受到过去所见刺激特征的影响，从而导致了串行依赖。然而，目前尚不清楚在何种条件下，刺激的次要特征会影响串行依赖。在这里，我们研究了刺激的颜色是否会影响方向调整任务中的串行依赖。观察者观看一系列随机改变颜色（红色或绿色）的定向刺激，并复制序列中最后一个刺激的方向。此外，他们要么在刺激中检测到特定的颜色（实验 1），要么辨别刺激的颜色（实验 2）。我们发现，颜色不会影响方向的串行依赖，并且观察者会受到先前方向的影响，而不受刺激颜色变化或重复的影响。即使当观察者被明确要求根据颜色来辨别刺激时，也会出现这种情况。总的来说，我们的两个实验表明，当任务涉及单一的基本特征（如方向）时，串行依赖不会受到刺激其他特征变化的影响。
