Perceptual cycles

VanRullen, Rufin

doi:10.1167/15.12.1401

Cited by 180 publications

(319 citation statements)

References 0 publications

Supporting

Mentioning

297

Contrasting

Unclassified

Order By: Relevance

“…S1B). Notably, the overall highest power in the alpha range was observed for the 10-Hz flicker condition without predictive context, in accordance with the hypothesized outcome that sensory alpha entrainment should increase perceptual alpha cycles (26,28) (Fig. 1 B and E).…”

Section: Perceptual Alpha Cycles Are Modulated By Lower Frequencies Dsupporting

confidence: 83%

See 1 more Smart Citation

Prefrontal cortex modulates posterior alpha oscillations during top-down guided visual perception

Helfrich

Huang

Wilson

et al. 2017

Proc. Natl. Acad. Sci. U.S.A.

103

View full text Add to dashboard Cite

Conscious visual perception is proposed to arise from the selective synchronization of functionally specialized but widely distributed cortical areas. It has been suggested that different frequency bands index distinct canonical computations. Here, we probed visual perception on a fine-grained temporal scale to study the oscillatory dynamics supporting prefrontal-dependent sensory processing. We tested whether a predictive context that was embedded in a rapid visual stream modulated the perception of a subsequent near-threshold target. The rapid stream was presented either rhythmically at 10 Hz, to entrain parietooccipital alpha oscillations, or arrhythmically. We identified a 2-to 4-Hz delta signature that modulated posterior alpha activity and behavior during predictive trials. Importantly, deltamediated top-down control diminished the behavioral effects of bottom-up alpha entrainment. Simultaneous source-reconstructed EEG and cross-frequency directionality analyses revealed that this delta activity originated from prefrontal areas and modulated posterior alpha power. Taken together, this study presents converging behavioral and electrophysiological evidence for frontal deltamediated top-down control of posterior alpha activity, selectively facilitating visual perception.top-down control | directional cross-frequency coupling | prefrontal cortex | alpha oscillations | phase-amplitude coupling V isual perception is flexible, selective, and rapidly integrates sensory evidence with endogenous high-level expectations and predictions (1, 2). It has been suggested that rhythmic brain activity constitutes a key mechanism to coordinate information flow in the human cerebral cortex by transiently forming task-relevant largescale networks (1). However, it is currently unclear how contextual information is dynamically integrated to support visual perception. Numerous studies have shown that visual perception critically depends on prestimulus alpha-band (8-12 Hz) activity (3-7). The gating-by-inhibition hypothesis postulates that alpha serves as a mechanism to route information to task-relevant cortical sites (8) but might also be under top-down control (6, 7). However, it is currently unclear which cortical regions and mechanisms mediate the directed top-down control of alpha oscillations (2). It has been suggested that slow-frequency activity in the delta range (<5 Hz) might reflect a mechanism for endogenous attentional selection and predictions (9, 10). In particular, endogenous low-frequency entrainment is thought to reflect a substrate of top-down processing (11)(12)(13)(14). Importantly, endogenous entrainment does not require rhythmicity in the input stream but reflects an intrinsic mechanism to enable predictions (15). Several studies have demonstrated that visual perception cycles as a function of the alpha phase but only a few reports have demonstrated that multiple rhythms modulate behavior on a fine-grained temporal scale (5,(16)(17)(18)(19).At present, it is uncertain how different temporal scales interact t...

show abstract

Section: Perceptual Alpha Cycles Are Modulated By Lower Frequencies Dsupporting

confidence: 83%

“…We sought to identify a mechanism that could mediate long-range top-down control of posterior alpha activity (2,25). We hypothesized that if the underlying functional architecture is rhythmic in nature, then multiple rhythms should modulate behavior and possibly arise from distinct cortical areas (2,26).…”

mentioning

confidence: 99%

Prefrontal cortex modulates posterior alpha oscillations during top-down guided visual perception

Helfrich

Huang

Wilson

et al. 2017

Proc. Natl. Acad. Sci. U.S.A.

103

View full text Add to dashboard Cite

show abstract

“…The present findings suggest that (i) methodologically, monitoring activity at the sub-second timescale in these regions may be necessary to resolve competing representations, and (ii) mechanistically, generative representation is coupled to the sub-second dynamics of specific activity patterns: here, the theta rhythm. This mechanistic link may furthermore extend to strikingly similar internally-generated sub-second patterns that govern sensory perception [85][86][87] and sensorimotor actions 88,89 ; these patterns, currently thought to reflect adaptive mechanisms for sampling information from the external world, may be coordinated with the sub-second patterns of generative activity described here, which can in turn be likened to sampling from internal representations 90,91 .…”

Section: Discussionmentioning

confidence: 65%

Regular cycling between representations of alternatives in the hippocampus

Kay

Sosa

et al. 2019

Preprint

View full text Add to dashboard Cite

Cognitive faculties such as imagination, planning, and decision-making entail the ability to project into the future. Crucially, animal behavior in natural settings implies that the brain can generate representations of future scenarios not only quickly but also constantly over time, as external events continually unfold. Despite this insight, how the brain accomplishes this remains unknown. Here we report neural activity in the hippocampus encoding two future scenarios (two upcoming maze paths) in constant alternation at 8 Hz: one scenario per 8 Hz cycle (125 ms). We further found that the underlying cycling dynamic generalized across multiple hippocampal representations (location and direction) relevant to future behavior. These findings identify an extremely fast and regular dynamical process capable of representing future possibilities.

show abstract

“…It has been suggested that alpha oscillations may function as gain controller, i.e., processing of information arriving at certain phases of the alpha oscillation will be facilitated (Jensen and Mazaheri 2010;Foxe and Snyder 2011;Jensen et al 2014;Womelsdorf et al 2014;VanRullen 2016). We hypothesized that, if this holds true, processing efficiency should depend on the phase of the alpha oscillation, and this phase relation should differ between the attend-to-visual and the attend-to-auditory condition.…”

Section: Attention-related Network Changesmentioning

confidence: 95%

Oscillatory Multi-Timescale Mechanisms Underlying Multisensory Sequence Prediction

Wang

Maÿe

Daume

et al. 2019

Preprint

View full text Add to dashboard Cite

Neural oscillations have been proposed to be involved in predictive processing by frequencyspecific modulation of either power or phase. While this is supported by substantial evidence on unimodal processing, only few studies are currently available that have addressed the role of oscillatory activity in multisensory predictions. In the present study, we have recorded MEG during a serial prediction task in which participants had to acquire stimulus sequences and to monitor whether subsequent probe items complied with the sequence. The sequences comprised combinations of visual and auditory stimuli, but on a given trial, only one of the modalities was task-relevant and the other had to be ignored. Task-related changes of power and coupling of neural oscillations were analyzed using a data-driven clustering approach. We observed prediction-related theta-band coupling in a network involving cingulate, premotor, prefrontal and superior temporal regions. Behavioral performance of the participants correlated with phase delays between remote regions in this network. Two additional clusters were detected where beta power were stronger when the previous or next stimuli were same as the current one in the sequence. These clusters interacted with the theta-band prediction network through crossfrequency coupling. Furthermore, we observed asymmetrical effects of attention to the visual and auditory modalities in a network distinguished by changes in alpha power, where alpha phases modulated response times. Overall, our results provide novel insights into the neural dynamics underlying multisensory predictions and suggest that oscillations in multiple frequency ranges as well as coupling within and across frequencies may be critical for sequence processing. Wang et al, Multisensory Sequence Prediction 3 KeywordsAttention, imaginary part of coherency, multisensory processing, phase-amplitude coupling.

show abstract

Perceptual cycles

Cited by 180 publications

References 0 publications

Prefrontal cortex modulates posterior alpha oscillations during top-down guided visual perception

Prefrontal cortex modulates posterior alpha oscillations during top-down guided visual perception

Regular cycling between representations of alternatives in the hippocampus

Oscillatory Multi-Timescale Mechanisms Underlying Multisensory Sequence Prediction

Contact Info

Product

Resources

About