A leaky evidence accumulation process for perceptual experience

Trends in Cognitive Sciences, Год журнала: 2022, Номер 26(6), С. 451 - 461

Опубликована: Апрель 2, 2022

Язык: Английский

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In the brain of the beholder: bi-stable motion reveals mesoscopic-scale feedback modulation in V1

Brain Structure and Function, Год журнала: 2025, Номер 230(3)

Опубликована: Апрель 5, 2025

Abstract Understanding the neural processes underlying conscious perception remains a central goal in neuroscience. Visual illusions, whether static or dynamic, provide an effective ecological paradigm for studying perception, as they induce subjective experiences from constant visual inputs. While previous neuroimaging studies have dissociated perceptual interpretation of motion sensory input within motion-sensitive area (hMT+) humans, less is known about role primary (V1) and its relationship to hMT+ during bistable perception. To address this, we conducted layer-fMRI study at 7 T with human participants exposed quartet stimulus. Despite input, elicits switching horizontal vertical apparent percepts likely due lateral feedback connections across low high-level brain regions (feedback processing). As control, used “unambiguous” version quartet, hereafter referred “physical” stimulus, where physically presented stimulus alternated fashion (feedforward With advantage sub-millimeter resolution gained ultra-high magnetic field (7 Tesla), aimed unveil differential laminar modulation V1 (early area) (high-order physical condition. Our results indicate that: (1) functional activity correlates both ambiguous stimuli similar strength. There no evidence profiles between two experimental conditions. (2) Between inducer squares, shows significantly reduced response compared it primarily reflects signals diminished feedforward input. Distinct differentiate (3) The temporal dynamics become more (4) exhibits specificity condition retinotopic locations corresponding perceived motion. findings demonstrate that condition, there stronger coupling V1. Such might be contributing stabilization vivid directed face stimulation.

Язык: Английский

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Multistability, perceptual value, and internal foraging

Neuron, Год журнала: 2022, Номер 110(19), С. 3076 - 3090

Опубликована: Авг. 29, 2022

Язык: Английский

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Bi-Stable Perception: Self-Coordinating Brain Regions to Make-Up the Mind

Frontiers in Neuroscience, Год журнала: 2022, Номер 15

Опубликована: Янв. 27, 2022

Bi-stable perception is a strong instance of cognitive self-organization, providing research model for how ‘the brain makes up its mind.’ The complexity perceptual bistability prevents simple attribution functions to areas, because many processes, recruiting multiple regions, are simultaneously involved. functional magnetic resonance imaging (fMRI) evidence suggests the activation large network distant areas. Concurrently, electroencephalographic and magnetoencephalographic (MEEG) literature shows sub second oscillatory activity phase synchrony on several frequency bands. Strongly represented beta gamma bands, often associated with neural/cognitive integration processes. spatial extension short duration activities need fast, large-scale neural coordination mechanism. To address range temporo-spatial scales involved, we systematize current knowledge from mathematical models, sciences neuroscience at large, single-cell- system-level research, including human non-human primates. Surprisingly, despite spanning through different organization levels, experimental approaches, scarcity integrative studies evident. In final section review dwell reasons behind such in order achieve real understanding complexities underlying bi-stable

Язык: Английский

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The Effect of Interocular Contrast Differences on the Appearance of Augmented Reality Imagery

ACM Transactions on Applied Perception, Год журнала: 2023, Номер 21(1), С. 1 - 23

Опубликована: Авг. 29, 2023

Augmented reality (AR) devices seek to create compelling visual experiences that merge virtual imagery with the natural world. These often rely on wearable near-eye display systems can optically overlay digital images left and right eyes of user separately. Ideally, two should be shown minimal radiometric differences (e.g., same overall luminance, contrast, color in both eyes), but achieving this binocular equality challenging stringent demands weight size. Basic vision research has a spectrum potentially detrimental perceptual effects elicited by between eyes, it is not clear whether how these findings apply experience modern AR devices. In work, we first develop testing paradigm for assessing multiple aspects appearance at once, characterize five key factors when participants viewed stimuli interocular contrast differences. second experiment, simulate optical see-through using conventional desktop LCD monitors use evaluate multi-faceted implications luminance differs eyes. We also include simulations monocular (i.e., which only one eye sees displayed image). Our results suggest drive several systems, such as luster, rivalry, spurious depth addition, displays tend have more artifacts than large difference A better understanding range likelihood phenomena help inform design choices support high-quality AR.

Язык: Английский

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Motion-induced blindness as a noisy excitable system

Vision Research, Год журнала: 2024, Номер 216, С. 108363 - 108363

Опубликована: Янв. 31, 2024

Язык: Английский

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Binocular rivalry under naturalistic geometry: Evidence from worlds simulated in virtual reality

PNAS Nexus, Год журнала: 2024, Номер 3(2)

Опубликована: Фев. 1, 2024

Abstract Binocular rivalry is a fascinating, widely studied visual phenomenon in which perception alternates between two competing images. This experience, however, generally restricted to laboratory settings where irreconcilable images are presented separately the eyes, an implausible geometry objects occupy same physical location. Such experiences stark contrast everyday behavior, almost never encountered, casting doubt on whether relevant our understanding of binocular vision. To investigate external validity rivalry, we manipulated geometric plausibility rival using naturalistic, cue-rich, 3D-corridor model created virtual reality. Rival stimuli were geometrically implausible, semi-plausible, or plausible layouts. Participants tracked fluctuations each these three layouts and for both static moving stimuli. Results revealed significant canonical alternations regardless geometrical stimulus type. Rivalry occurred that mirrored unnatural used studies mimicked real-world occlusion geometry. In complementary 3D modeling analysis, show interocular conflict caused by common outcome scene containing multiple objects. Together, findings demonstrate can reliably occur conflicts form naturalistic occlusion. Thus, key features not simply artifacts but generalize conditions match

Язык: Английский

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A new ‘CFS tracking’ paradigm reveals uniform suppression depth regardless of target complexity or salience

eLife, Год журнала: 2024, Номер 12

Опубликована: Апрель 29, 2024

When the eyes view separate and incompatible images, brain suppresses one image promotes other into visual awareness. Periods of interocular suppression can be prolonged during continuous flash (CFS) – when eye views a static ‘target’ while complex dynamic stimulus. Measuring time needed for suppressed to break CFS (bCFS) has been widely used investigate unconscious processing, results have generated controversy regarding scope processing without Here, we address this with new ‘CFS tracking’ paradigm (tCFS) in which monocular target steadily increases contrast until breaking awareness (as bCFS) after it decreases again disappears (reCFS), cycle continuing many reversals. Unlike bCFS, tCFS provides measure depth by quantifying difference between breakthrough thresholds. confirms that (i) thresholds indeed differ across types (e.g. faces vs gratings, as bCFS shown) but (ii) does not vary types. Once is reached given stimulus, all stimuli require strikingly uniform reduction reach corresponding threshold. This points single mechanism suppression, likely occurs early because was modulated salience or complexity. More fundamentally, shows variations alone are insufficient inferring whether barrier achieving exerted weaker some categories compared others.

Язык: Английский

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Bistability of prefrontal states gates access to consciousness

bioRxiv (Cold Spring Harbor Laboratory), Год журнала: 2020, Номер unknown

Опубликована: Янв. 30, 2020

Summary Access of sensory information to consciousness is thought be mediated through ignition neural activity in the prefrontal cortex (PFC). Ignition occurs once elicited by input crosses a threshold, which has been shown depend on brain state fluctuations. However, correlates fluctuations and their interaction with representations conscious contents within PFC remain largely unknown. To understand role access, we combined multielectrode intracortical recordings no-report binocular rivalry (BR) paradigm that induces spontaneously-driven changes perception. During BR, antagonistic coupling two states, characterised dominance low frequency (1-9Hz) or beta (20-40Hz) local field potentials (LFP), reflect competition between states visual consciousness; perceptual update stability, respectively. Low perisynaptic bursts precede spontaneous transitions perception, signalling upcoming content. We therefore show it global cortical seems drive internal switches, rather than spiking selective neuronal ensembles, subsequently, only report active percept. Beta band were found correlated periods stable selectively synchronised ensemble coding for consciously perceived stimulus. Similar ongoing LFPs, dynamics resembling distribution during dominated resting-state, thus pointing default, endogenous nature. Our results suggest modes perception: update, can associated distinct states.

Язык: Английский

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Neural representations of competing stimuli along the dorsal and ventral visual pathways during binocular rivalry

Cerebral Cortex, Год журнала: 2022, Номер 33(6), С. 2734 - 2747

Опубликована: Июнь 11, 2022

Abstract Binocular rivalry arises when two discrepant stimuli are simultaneously presented to different eyes, during which observers consciously experience vivid perceptual alternations without physical changes in visual inputs. Neural dynamics tracking such have been identified at both early and late areas, leading the fundamental debate concerning primary neural substrate underlying binocular rivalry. One promising hypothesis that might reconcile these seemingly paradoxical findings is a gradual shift from interocular competition between monocular neurons pattern among neurons. Here, we examined this by investigating how representations of rivalrous evolved along pathway. We found dominant suppressed initially co-existed V1, were enhanced attenuated respectively extrastriate areas. Notably, activity V4 was dictated representation stimulus, while stimulus only partially inhibited dorsal areas V3A MT+. Our revealed progressive transition co-existing inputs dictatorial ventral pathway, advocated cortical evolutionary patterns pathways.

Язык: Английский

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