Mediofrontal theta‐band oscillations reflect top‐down influence in the ventriloquist illusion

Kaiser, Mathis; Senkowski, Daniel; Keil, Julian

doi:10.1002/hbm.25236

Cited by 5 publications

(3 citation statements)

References 56 publications

(81 reference statements)

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“…Other studies have also investigated theta power in other aspects of multisensory processing. For example, an EEG ventriloquism study found lower pre-stimulus theta power in trials in which participants experienced the illusion versus trials in which they did not [ 60 ]. This result does not necessarily go in opposition to ours, as it explored the pre-stimulus period, instead of post-stimulus induced activity.…”

Section: Discussionmentioning

confidence: 99%

The role of conflict processing in multisensory perception: behavioural and electroencephalography evidence

Marly,

Yazdjian,

Soto-Faraco

2023

Phil. Trans. R. Soc. B

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To form coherent multisensory perceptual representations, the brain must solve a causal inference problem: to decide if two sensory cues originated from the same event and should be combined, or if they came from different events and should be processed independently. According to current models of multisensory integration, during this process, the integrated (common cause) and segregated (different causes) internal perceptual models are entertained. In the present study, we propose that the causal inference process involves competition between these alternative perceptual models that engages the brain mechanisms of conflict processing. To test this hypothesis, we conducted two experiments, measuring reaction times (RTs) and electroencephalography, using an audiovisual ventriloquist illusion paradigm with varying degrees of intersensory disparities. Consistent with our hypotheses, incongruent trials led to slower RTs and higher fronto-medial theta power, both indicative of conflict. We also predicted that intermediate disparities would yield slower RTs and higher theta power when compared to congruent stimuli and to large disparities, owing to the steeper competition between causal models. Although this prediction was only validated in the RT study, both experiments displayed the anticipated trend. In conclusion, our findings suggest a potential involvement of the conflict mechanisms in multisensory integration of spatial information. This article is part of the theme issue ‘Decision and control processes in multisensory perception’.

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Section: Discussionmentioning

confidence: 99%

The role of conflict processing in multisensory perception: behavioural and electroencephalography evidence

Marly,

Yazdjian,

Soto-Faraco

2023

Phil. Trans. R. Soc. B

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“…In addition, in terms of the theta band, while the current review focused on theta generation in areas such as the hippocampus and PFC during memory processes, recent research has implicated theta as a mechanism in top-down processing from the mediofrontal cortex during multimodal processing during phenomena such as the ventriloquist illusion. 141 Moreover, the interaction of theta and gamma oscillations (eg, thetagamma coupling) my play a key role in visual selective and sustained attention. 142,143 In this context, low-frequency oscillations in the theta range may play a crucial role in bringing together local information processing by neurons engaged in high-frequency oscillatory activity in the gamma range.…”

Section: Cannabinoids and Neural Oscillations: Clinical Implications ...mentioning

confidence: 99%

The Relationship Between Cannabinoids and Neural Oscillations: How Cannabis Disrupts Sensation, Perception, and Cognition

et al. 2022

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Disruptions in neural oscillations are believed to be one critical mechanism by which cannabinoids, such as delta-9-tetrahyrdrocannabinol (THC; the primary psychoactive constituent of cannabis), perturbs brain function. Here we briefly review the role of synchronized neural activity, particularly in the gamma (30–80 Hz) and theta (4–7 Hz) frequency range, in sensation, perception, and cognition. This is followed by a review of clinical studies utilizing electroencephalography (EEG) which have demonstrated that both chronic and acute cannabinoid exposure disrupts neural oscillations in humans. We also offer a hypothetical framework through which endocannabinoids modulate neural synchrony at the network level. This also includes speculation on how both chronic and acute cannabinoids disrupt functionally relevant neural oscillations by altering the fine tuning of oscillations and the inhibitory/excitatory balance of neural circuits. Finally, we highlight important clinical implications of such oscillatory disruptions, such as the potential relationship between cannabis use, altered neural synchrony, and disruptions in sensation, perception, and cognition, which are perturbed in disorders such as schizophrenia.

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“…We here address this question using the spatial ventriloquism paradigm as a model (Bertelson et al, 2000;Bruns, 2019;Bruns et al, 2014;Howard & Templeton, 1966;Kaiser et al, 2021). Across four experiments, we asked how two visual signals are combined with one sound to shape judgements about the sound's location.…”

mentioning

confidence: 99%

Both stimulus‐specific and configurational features of multiple visual stimuli shape the spatial ventriloquism effect

Kayser,

Debats,

Heuer

2024

Eur J of Neuroscience

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Studies on multisensory perception often focus on simplistic conditions in which one single stimulus is presented per modality. Yet, in everyday life, we usually encounter multiple signals per modality. To understand how multiple signals within and across the senses are combined, we extended the classical audio‐visual spatial ventriloquism paradigm to combine two visual stimuli with one sound. The individual visual stimuli presented in the same trial differed in their relative timing and spatial offsets to the sound, allowing us to contrast their individual and combined influence on sound localization judgements. We find that the ventriloquism bias is not dominated by a single visual stimulus but rather is shaped by the collective multisensory evidence. In particular, the contribution of an individual visual stimulus to the ventriloquism bias depends not only on its own relative spatio‐temporal alignment to the sound but also the spatio‐temporal alignment of the other visual stimulus. We propose that this pattern of multi‐stimulus multisensory integration reflects the evolution of evidence for sensory causal relations during individual trials, calling for the need to extend established models of multisensory causal inference to more naturalistic conditions. Our data also suggest that this pattern of multisensory interactions extends to the ventriloquism aftereffect, a bias in sound localization observed in unisensory judgements following a multisensory stimulus.

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Mediofrontal theta‐band oscillations reflect top‐down influence in the ventriloquist illusion

Cited by 5 publications

References 56 publications

The role of conflict processing in multisensory perception: behavioural and electroencephalography evidence

The role of conflict processing in multisensory perception: behavioural and electroencephalography evidence

The Relationship Between Cannabinoids and Neural Oscillations: How Cannabis Disrupts Sensation, Perception, and Cognition

Both stimulus‐specific and configurational features of multiple visual stimuli shape the spatial ventriloquism effect

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