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Wang, Tongyu; Zhao, Yuqing; Jia, Jianrong
iScience, 10/2023, Letnik: 26, Številka: 10Journal Article
Statistically summarizing information from a stimulus array into an ensemble representation (e.g., the mean) improves the efficiency of visual processing. However, little is known about how the brain computes the ensemble statistics. Here, we propose that ensemble processing is realized by nonadditive integration, rather than linear averaging, of individual items. We used a linear regression model approach to extract EEG responses to three levels of information: the individual items, their local interactions, and their global interaction. The local and global interactions, representing nonadditive integration of individual items, elicited rapid and independent neural responses. Critically, only the neural representation of the global interaction predicted the precision of the ensemble perception at the behavioral level. Furthermore, spreading attention over the global pattern to enhance ensemble processing directly promoted rapid neural representation of the global interaction. Taken together, these findings advocate a global, nonadditive mechanism of ensemble processing in the brain. Display omitted •The interactions between individual stimuli can elicit independent neural responses•Ensemble perception involves the global interaction of individual stimuli•Spreading attention enhances the neural representation of global interaction Neuroscience; Sensory neuroscience; Cognitive neuroscience
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