Backward alpha oscillations shape perceptual bias under probabilistic cues DOI Creative Commons
Luca Tarasi, Andrea Alamia, Vincenzo Romei

et al.

bioRxiv (Cold Spring Harbor Laboratory), Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 16, 2025

Abstract Predictive coding theory suggests that prior knowledge is crucial for optimizing human decision-making, with recent studies emphasizing the role of alpha-band oscillations in this process. Here, we employed a traveling waves approach to investigate how alpha integrate expectations during perceptual decision-making task. Our findings demonstrated expectation-based triggers propagation from frontal occipital areas, increase associated enhanced modulation brain regions involved stimulus processing and directly linked prior-driven bias at behavioral level. Moreover, participants who relied more on exhibited stronger top-down signaling, whereas those focused sensory input showed contrasting forward signaling pattern. These results highlight predictive mechanisms, suggesting rhythmic interactions across facilitate process contribute inter-individual differences its implementation.

Language: Английский

What do neural travelling waves tell us about information flow? DOI Creative Commons
Andrea Alamia, Antoine Grimaldi, Frédéric Chavane

et al.

bioRxiv (Cold Spring Harbor Laboratory), Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 25, 2025

Abstract In many behavioral conditions, neural activity propagates within and across brain regions as traveling waves, revealing the importance of analyzing spatiotemporal dynamics in electrophysiological data. Most methods quantify such propagation by measuring spatial phase gradients, i.e., monotonic ordered changes through space. Here, we demonstrate that ordering travelling waves is insufficient to determine effective flow information unambiguously. We that, some specific cases, gradient indicates opposite direction than indicated for causal inference. Using autoregressive modeling, further show a discrepancy between apparent measured via phase-based can, example, be predicted sign projection from lower higher nodes hierarchy. Together with an input signal lowest node, inhibitory bottom-up connections produce propagating opposite, top-down direction. As methodological solution, Granger causality analysis can recover its underlying structure, which used disambiguate “effective” flow.

Language: Английский

Citations

0
Backward alpha oscillations shape perceptual bias under probabilistic cues DOI Creative Commons
Luca Tarasi, Andrea Alamia, Vincenzo Romei

et al.

bioRxiv (Cold Spring Harbor Laboratory), Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 16, 2025

Abstract Predictive coding theory suggests that prior knowledge is crucial for optimizing human decision-making, with recent studies emphasizing the role of alpha-band oscillations in this process. Here, we employed a traveling waves approach to investigate how alpha integrate expectations during perceptual decision-making task. Our findings demonstrated expectation-based triggers propagation from frontal occipital areas, increase associated enhanced modulation brain regions involved stimulus processing and directly linked prior-driven bias at behavioral level. Moreover, participants who relied more on exhibited stronger top-down signaling, whereas those focused sensory input showed contrasting forward signaling pattern. These results highlight predictive mechanisms, suggesting rhythmic interactions across facilitate process contribute inter-individual differences its implementation.

Language: Английский

Citations

0