Cortical time-course of evidence accumulation during semantic processing

Communications Biology, Journal Year: 2023, Volume and Issue: 6(1)

Published: Dec. 8, 2023

Our understanding of the surrounding world and communication with other people are tied to mental representations concepts. In order for brain recognize an object, it must determine which concept access based on information available from sensory inputs. this study, we combine magnetoencephalography machine learning investigate how concepts represented accessed in over time. Using responses a silent picture naming task, track dynamics visual semantic processing, show that gradually accumulates different levels before eventually reaching plateau. The timing plateau point varies across individuals feature models, indicating notable temporal variation object recognition processing.

Language: Английский

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When Abstract Becomes Concrete: Naturalistic Encoding of Concepts in the Brain

Published: Jan. 10, 2024

Language is acquired and processed in complex dynamic naturalistic contexts, involving simultaneous processing of connected speech, faces, bodies, objects, etc.. How words their associated concepts are encoded the brain during real-world still unknown. Here, representational structure concrete abstract was investigated movie watching to address extent which responses dynamically change depending on contextual information. First, across shown encode different experience-based information separable sets regions. However, these differences reduced when multimodal context considered. Specifically, response profile becomes more concrete-like visual scenes highly related meaning. Conversely, unrelated a given word, activation pattern resembles that conceptual processing. These results suggest while generally habitual experiences, underlying neurobiological organisation not fixed but depends available

Language: Английский

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Neural Dynamics of the Processing of Speech Features: Evidence for a Progression of Features from Acoustic to Sentential Processing

bioRxiv (Cold Spring Harbor Laboratory), Journal Year: 2024, Volume and Issue: unknown

Published: Feb. 2, 2024

When we listen to speech, our brain's neurophysiological responses "track" its acoustic features, but it is less well understood how these auditory are modulated by linguistic content. Here, recorded magnetoencephalography (MEG) while subjects listened four types of continuous-speech-like passages: speech-envelope noise, English-like non-words, scrambled words, and narrative passage. Temporal response function (TRF) analysis provides strong neural evidence for the emergent features speech processing in cortex, from acoustics higher-level linguistics, as incremental steps processing. Critically, show a stepwise hierarchical progression progressively higher order over time, reflected both bottom-up (early) top-down (late) stages. Linguistically driven mechanisms take form late N400-like responses, suggesting central role predictive coding at multiple levels. As expected, lower-level feature bilateral or right lateralized, with left lateralization emerging only lexical-semantic features. Finally, results identify potential markers computations underlying perception comprehension.

Language: Английский

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When Abstract Becomes Concrete: Naturalistic Encoding of Concepts in the Brain

Published: Sept. 17, 2024

Language is acquired and processed in complex dynamic naturalistic contexts, involving simultaneous processing of connected speech, faces, bodies, objects, etc.. How words their associated concepts are encoded the brain during real-world still unknown. Here, representational structure concrete abstract was investigated movie watching to address extent which responses dynamically change depending on visual context. First, across shown encode different experience-based information separable sets regions. However, these differences reduced when multimodal context considered. Specifically, response profile becomes more concrete-like scenes highly related meaning. Conversely, unrelated a given word, activation pattern resembles that conceptual processing. These results suggest while generally habitual experiences, underlying neurobiological organisation not fixed but depends available contextual information.

Language: Английский

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