Binder Marek, Gociewicz Krzysztof, Windey Bert, Koculak Marcin, Finc Karolina, Nikadon Jan, Derda Monika, Cleeremans Axel
Psychophysiology Laboratory, Institute of Psychology, Jagiellonian University, Kraków, Poland.
Psychophysiology Laboratory, Institute of Psychology, Jagiellonian University, Kraków, Poland.
Conscious Cogn. 2017 Oct;55:106-125. doi: 10.1016/j.concog.2017.07.010. Epub 2017 Aug 18.
According to the levels-of-processing hypothesis, transitions from unconscious to conscious perception may depend on stimulus processing level, with more gradual changes for low-level stimuli and more dichotomous changes for high-level stimuli. In an event-related fMRI study we explored this hypothesis using a visual backward masking procedure. Task requirements manipulated level of processing. Participants reported the magnitude of the target digit in the high-level task, its color in the low-level task, and rated subjective visibility of stimuli using the Perceptual Awareness Scale. Intermediate stimulus visibility was reported more frequently in the low-level task, confirming prior behavioral results. Visible targets recruited insulo-fronto-parietal regions in both tasks. Task effects were observed in visual areas, with higher activity in the low-level task across all visibility levels. Thus, the influence of level of processing on conscious perception may be mediated by attentional modulation of activity in regions representing features of consciously experienced stimuli.
根据加工水平假说，从无意识感知到有意识感知的转变可能取决于刺激加工水平，低水平刺激的变化更为渐进，而高水平刺激的变化更为二分。在一项事件相关功能磁共振成像研究中，我们使用视觉反向掩蔽程序探索了这一假说。任务要求操纵了加工水平。参与者在高水平任务中报告目标数字的大小，在低水平任务中报告其颜色，并使用感知意识量表对刺激的主观可见性进行评分。在低水平任务中，中等刺激可见性的报告更为频繁，这证实了先前的行为结果。在两项任务中，可见目标均激活了脑岛-额顶叶区域。在视觉区域观察到了任务效应，在所有可见性水平上，低水平任务中的活动更高。因此，加工水平对有意识感知的影响可能是通过对代表有意识体验刺激特征的区域活动的注意力调节来介导的。
