Weilnhammer Veith, Chikermane Meera, Sterzer Philipp
Department of Psychiatry, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Charitéplatz 1, 10117 Berlin, Germany.
Berlin Institute of Health, Charité-Universitätsmedizin Berlin and Max Delbrück Center, 10178 Berlin, Germany.
iScience. 2021 Feb 26;24(3):102234. doi: 10.1016/j.isci.2021.102234. eCollection 2021 Mar 19.
Perceptual history can exert pronounced effects on the contents of conscious experience: when confronted with completely ambiguous stimuli, perception does not waver at random between diverging stimulus interpretations but sticks with recent percepts for prolonged intervals. Here, we investigated the relevance of perceptual history in situations more similar to everyday experience, where sensory stimuli are usually not completely ambiguous. Using partially ambiguous visual stimuli, we found that the balance between past and present is not stable over time but slowly fluctuates between two opposing modes. For time periods of up to several minutes, perception was either largely determined by perceptual history or driven predominantly by disambiguating sensory evidence. Computational modeling suggested that the construction of unambiguous conscious experiences is modulated by slow fluctuations between internally and externally oriented modes of sensory processing.
当面对完全模糊的刺激时，感知不会在不同的刺激解释之间随机摇摆，而是会在较长时间内保持与近期感知一致。在此，我们研究了感知历史在更类似于日常体验的情境中的相关性，在这种情境中，感官刺激通常并非完全模糊。使用部分模糊的视觉刺激，我们发现过去与现在之间的平衡并非随时间保持稳定，而是在两种相反模式之间缓慢波动。在长达几分钟的时间段内，感知要么在很大程度上由感知历史决定，要么主要由消除歧义的感官证据驱动。计算模型表明，明确的意识体验的构建受到感官处理的内部和外部导向模式之间的缓慢波动的调节。
