Auditory stimuli extend the temporal window of visual integration by modulating alpha-band oscillations

bioRxiv (Cold Spring Harbor Laboratory), Год журнала: 2024, Номер unknown

Опубликована: Янв. 31, 2024

Abstract In multisensory environments, how inputs from different sensory modalities interact to shape perception are not fully understood. this study, we investigated auditory stimuli influence the temporal dynamics of visual processing using electroencephalography (EEG). Participants were presented with two consecutive flashes, either accompanied by an beep or without, and asked report their one flashes. Behaviorally, found that introduction input induced a longer window for integration. Alpha frequency analysis further revealed presence led poststimulus alpha degradation, positively correlating prolonged window, supporting idea oscillations represent Further exploration prestimulus diminished predictive role while enhancing phase in shaping perceptual outcomes. A follow-up transcranial alternating current stimulation (tACS) experiment confirmed have causal modulating absence but when present. To probe underlying mechanisms, developed computational model based on phase-resetting hypothesis cycle theory, which successfully replicated core findings. These results reveal extends integration resetting cortex, leading reduction altered events. This study advances understanding cross-modal interactions highlights dynamic, adaptive processes

Язык: Английский

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Alpha-band oscillations and visual temporal resolution: An expansion and partial replication of Samaha & Postle’s 2015 study: “The Speed of Alpha-Band Oscillations Predicts the Temporal Resolution of Visual Perception”

Authorea (Authorea), Год журнала: 2024, Номер unknown

Опубликована: Май 6, 2024

The study of alpha band oscillations in the brain is a popular topic cognitive neuroscience. A fair amount research recent years has focused on potential role these may play discrete sampling continuous sensory information. In particular, question whether or not peak frequency linked with temporal resolution visual perception ongoing debate. Some studies have reported correlation between two, whereas others were unable to observe link. It unclear conflicting findings are due differing methodologies and/or low statistical power, absence true relationship. Replication needed gain better insight into this matter. current study, we replicated an experiment published 2015 paper by Samaha & Postle. Additionally, expanded adding extra behavioural task, critical flicker fusion investigate if any links generalizable across multiple measures for resolution. We succeeded replicating some, but all Postle’s findings. Our partial replication suggests that there be link and frequency. However, relationship very small only apparent specific stimulus parameters. correlations found our did generalize other

Язык: Английский

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Detecting behavioural oscillations with increased sensitivity: A modification of Brookshire's (2022) AR-surrogate method

bioRxiv (Cold Spring Harbor Laboratory), Год журнала: 2024, Номер unknown

Опубликована: Авг. 23, 2024

Abstract A core challenge of cognitive neuroscience is to understand how cognition changes over time within the same individual. For example, tendency for behavioural responses in a range domains oscillate has been studied extensively. Recently, however, phenomenon oscillations called into question by indications that past findings might reflect aperiodic temporal structure rather than true oscillations. Brookshire (2022) proposed methods control while examining time-courses and found no evidence reanalyses four published datasets. However, Brookshire’s method criticised having low sensitivity detect effects realistic magnitude, so it currently unclear whether these suggest are not present perhaps many other datasets, or they false negatives. Here, we modification AR-surrogate with increased adequate positives, desirable properties such as ability increase statistical power adding more participants. Using this method, reanalyse publicly available datasets show significant each them, suggesting behaviour robust upon which draw theoretical inferences. The participant-level most sensitive analysing controlling contribution data fluctuations.

Язык: Английский

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Effects of oscillation phase on discrimination performance in a visual tilt illusion

bioRxiv (Cold Spring Harbor Laboratory), Год журнала: 2023, Номер unknown

Опубликована: Дек. 21, 2023

Summary Neural oscillations reflect fluctuations in the relative excitation/inhibition of neural systems 1–5 and are theorised to play a critical role several canonical computations 6–9 cognitive processes 10–14 . These theories have been supported by findings that detection visual stimuli fluctuates with phase at time stimulus onset 15–23 However, null results emerged studies seeking demonstrate these effects discrimination tasks 24–27 , raising questions about generalisability phenomena wider processes. Recently, we suggested methodological limitations may mask oscillation higher-level sensory processing 28 Thus, test generality phasic influences requires task but depends on early processing. Here, examined influence tilt illusion, which an oriented centre grating is perceived titled away from orientation surround 29 This illusion produced lateral inhibitory interactions 30–32 We presented gratings participants’ titrated subjective vertical angle had participants report whether appeared tilted leftward or rightward each trial while measuring their brain activity EEG. observed robust fluctuation perception across different phases posterior alpha theta oscillations, consistent fluctuating magnitude oscillatory cycle. confirm affects complex involved discrimination, purported underpin cognition.

Язык: Английский

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