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• W4223908046 abstract "Abstract Understanding speech requires mapping fleeting and often ambiguous soundwaves to meaning. While humans are known to exploit their capacity to contextualize to facilitate this process, how internal knowledge is deployed on-line remains an open question. Here, we present a model that extracts multiple levels of information from continuous speech online. The model applies linguistic and nonlinguistic knowledge to speech processing, by periodically generating top-down predictions and incorporating bottom-up incoming evidence in a nested temporal hierarchy. We show that a nonlinguistic context level provides semantic predictions informed by sensory inputs, which are crucial for disambiguating among multiple meanings of the same word. The explicit knowledge hierarchy of the model enables a more holistic account of the neurophysiological responses to speech compared to using lexical predictions generated by a neural-network language model (GPT-2). We also show that hierarchical predictions reduce peripheral processing via minimizing uncertainty and prediction error. With this proof-of-concept model we demonstrate that the deployment of hierarchical predictions is a possible strategy for the brain to dynamically utilize structured knowledge and make sense of the speech input." @default.
• W4223908046 created "2022-04-19" @default.
• W4223908046 creator A5004778550 @default.
• W4223908046 creator A5036114846 @default.
• W4223908046 creator A5066126918 @default.
• W4223908046 date "2022-04-05" @default.
• W4223908046 modified "2023-10-01" @default.
• W4223908046 title "A deep hierarchy of predictions enables assignment of semantic roles in online speech comprehension" @default.
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