Pfabigan Daniela M, Sailer Uta, Lamm Claus
Social, Cognitive and Affective Neuroscience Unit, Department of Basic Psychological Research and Research Methods, Faculty of Psychology, University of Vienna, Vienna, Austria.
Department of Psychology, Faculty of Social Sciences, University of Gothenburg, Gothenburg, Sweden.
Psychophysiology. 2015 Sep;52(9):1238-47. doi: 10.1111/psyp.12458. Epub 2015 Jun 8.
The current study investigated whether or not the physical aspect of stimulus size has an effect on neuronal correlates of feedback processing. A time estimation task was administered applying three different feedback stimulus categories: small, middle, and large size stimuli. Apart from early visual ERPs such as P1 and N1 components, later feedback processing stages were also affected by the size of feedback stimuli. In particular, small size stimuli compared to middle and large size ones led to diminished amplitudes in both FRN and P300 components, despite intact discrimination between negative and positive outcomes in these two ERPs. In contrast, time estimation performance was not influenced by feedback size. The current results indicate that small size feedback stimuli were perceived as less salient and hence were processed less deeply than the others. This suggests that future feedback studies could manipulate feedback salience simply by presenting differently sized feedback stimuli, at least when the focus lies on FRN and P300 amplitude variation.
当前的研究调查了刺激大小的物理属性是否会对反馈处理的神经元关联产生影响。我们进行了一项时间估计任务，应用了三种不同的反馈刺激类别：小、中、大尺寸的刺激。除了早期视觉事件相关电位（ERPs），如P1和N1成分外，后期的反馈处理阶段也受到反馈刺激大小的影响。特别是，与中、大尺寸刺激相比，小尺寸刺激导致FRN和P300成分的振幅减小，尽管这两种ERP中对负面和正面结果的辨别是完整的。相比之下，时间估计表现不受反馈大小的影响。当前的结果表明，小尺寸反馈刺激被认为不那么突出，因此与其他刺激相比处理得不够深入。这表明，未来的反馈研究可以通过呈现不同大小的反馈刺激来简单地操纵反馈显著性，至少当重点在于FRN和P300振幅变化时。
