Significance Neural oscillations are hypothesized to play an important role in modulating perceptual processing accordance with top-down goals. For instance, the amplitude, phase, and spatial distribution of alpha-band change attention. Given recent links between peak frequency alpha temporal resolution perception, we investigated whether modulation occurs when task demands emphasize integration or segregation visual input over time. We found that occipital–temporal cortex decreased during,...

When processing dynamic input, the brain balances opposing needs of temporal integration and sensitivity to change. We hypothesized that visual system might resolve this challenge by aligning windows onset newly arriving sensory samples. In a series experiments, human participants observed same sequence two displays separated brief blank delay when performing either an or segregation task. First, using magneto-encephalography (MEG), we found shift in stimulus-evoked time courses 150-ms...

Dynamic vision requires both stability of the current perceptual representation and sensitivity to accumulation sensory evidence over time. Here we study electrophysiological signatures this intricate balance between temporal segregation integration in vision. Within a forward masking paradigm with short long stimulus onset asynchronies (SOA), manipulated overlap visual persistence two successive transients. Human observers enumerated items presented second target display as measure...

Abstract Perceptual systems must create discrete objects and events out of a continuous flow sensory information. Previous studies have demonstrated oscillatory effects in the behavioral outcome low-level visual tasks, suggesting cyclic nature processing as solution. To investigate whether these extend to more complex stream “neutral” photographic images (not containing targets) was rapidly presented (20 ms/image). Embedded were one or two presentations randomly selected target image...

Ongoing fluctuations in neural excitability and networkwide activity patterns before stimulus onset have been proposed to underlie variability near-threshold detection paradigms-that is, whether or not an object is perceived. Here, we investigated the impact of prestimulus on content perception-that one another We recorded with magnetoencephalography (MEG) while participants briefly viewed ambiguous image, Rubin face/vase illusion, required them report their perceived interpretation each...

Ongoing oscillatory neural activity before stimulus onset influences subsequent visual perception. Specifically, both the power and phase of oscillations in alpha-frequency band (9-13 Hz) have been reported to predict detection stimuli. Up now, functional mechanisms underlying pre-stimulus effects on upcoming percepts are debated. Here, we used magnetoencephalography recordings together with a near-threshold task investigate generators their impact visual-evoked responses. Pre-stimulus...

Capacity limits are a hallmark of visual cognition. The upper boundary our ability to individuate and remember objects is well known but-despite its central role in information processing-not understood. Here, we investigated the temporal perceptual processes forming "object files." Specifically, examined two fundamental mechanisms object file formation-individuation identification-by selectively interfering with processing by using forward backward masking variable stimulus onset...

Human observers tend to group oriented line segments into full contours if they follow the Gestalt rule of 'good continuation'. It is commonly assumed that contour grouping emerges automatically in early visual cortex. In contrast, recent work animal models suggests requires learning and thus involves top-down control from higher brain structures. Here we explore mechanisms perceptual by investigating synchronicity within EEG oscillations. participants saw two micro-Gabor arrays a random...

The visual system uses two complimentary strategies to process multiple objects simultaneously within a scene and update their spatial positions in real time. It either selective attention individuate complex, dynamic into few focal (i.e., object individuation), or it represents as an ensemble by distributing more globally across the grouping). Neural oscillations may be key signature for individuation versus distributed grouping, because they are thought regulate neural excitability over...

The number of items that can be individuated at a single glance is limited. Here, we investigate object individuation higher temporal resolution, in fractions glance. In two experiments involving manipulated the duration visual persistence target with forward masking procedure. as well their stimulus–onset asynchrony (SOA) to mask was varied independently. results showed main effects numerosity and SOA, an interaction. These were not caused by generic reduction item visibility mask. Instead,...

Abstract Ensemble perception refers to the ability report attributes of a group objects, rather than focusing on only one or few individuals. An everyday example ensemble is estimate numerosity large number items. The time course processing, including that numerical estimation, remains matter debate, with some studies arguing for rapid, “preattentive” processing and other suggesting improves longer presentation durations. We used forward-simultaneous masking procedure effectively controls...

Abstract Recent neuroscience experiments have brought inconsistent findings to light about the influence of neural activity in alpha-frequency band (at ≈10 Hz) on temporal dynamics visual perception. Whereas strong alpha effects were found when perception was more based endogenous factors, there null-effects for relied objective physical parameters. In this Perspective, I open up a new view that resolves some important aspects controversy by interpreting not as processing sensory inputs per...

Perception of temporal duration is subjective and influenced by factors such as attention context. For example, unexpected or emotional events are often experienced if time subjectively expands, suggesting that the amount information processed in a unit can be increased. Time dilation effects have been measured with an oddball paradigm which infrequent stimulus perceived to last longer than standard stimuli rest sequence. Likewise, compression for occurs when items relatively brief. Here, we...

Early, feed-forward visual processing is organized in a retinotopic reference frame. In contrast, feature integration on longer time scales can involve object-based or spatiotopic coordinates. For example, the Ternus-Pikler (T-P) apparent motion display, object identity mapped across path. Here, we report evidence from three experiments supporting nonretinotopic even for most paradigmatic example of retinotopically-defined features: orientation. We presented observers with repeated series...

Dynamic vision must balance the need to accumulate sensory evidence over time and maintain stability of current perceptual representation. Those opposing needs visual system can be subserved by an intricate interplay between rapid saccadic eye movements longer lasting fixations on relevant parts environment. Here we investigate whether influence ability integrate successive input time. We took advantage a temporal integration paradigm that requires observers perceptually bridge short gap two...

Abstract The brain receives a constant, analogue flow of stimulation from each the senses. One main goals perceptual systems is to segregate this steady influx into meaningful spatio-temporal units such as objects and events. Perception objects, motion or events requires information be integrated over period time. Such temporal integration windows (TIW) are thought operate across multiple timescales ( Gibbon et al., 1997 ; Poeppel, 1999). For example, studies perceived duration simultaneity...

Ongoing fluctuations in neural excitability and connectivity influence whether or not a stimulus is seen. Do they also which seen? We recorded magnetoencephalography data while 21 human participants viewed face house stimuli, either one at time under bistable conditions induced through binocular rivalry. Multivariate pattern analysis revealed common substrates for rivalrous versus nonrivalrous stimuli with an additional delay of ∼36 msec the stimulus, poststimulus signals were...

Abstract Ongoing fluctuations in neural excitability and network-wide activity patterns before stimulus onset have been proposed to underlie variability near-threshold detection paradigms, i.e. whether an object is perceived or not. Here, we investigated the impact of pre-stimulus on content perception, one another perceived. We recorded with magnetoencephalography while participants briefly viewed ambiguous image, Rubin face/vase illusion, required them report their interpretation each...

Early visual processing is based on orientation-selective receptive fields in a retinotopic reference frame. Perception of features over longer time scales, exceeding this fast feedforward encoding, has been demonstrated to involve object-based, rather than only coordinates (Fracasso et al., 2010; Boi 2011). For example, non-retinotopic encoding found using the Ternus-Pikler (T-P) apparent motion display which object identity mapped across path given inter-stimulus interval (ISI)...

Brief, unexpected events are often experienced as passing in slow motion, if time subjectively expands. Such dilation can be measured an oddball paradigm, which infrequent stimulus is perceived to last longer than the standard stimuli rest of sequence. In contrast, compression occurs when duration items sequence brief (Tse et al., 2004). Here, we investigated whether rate information processing changes distorted. We presented a fixed (either 70 or 1050 ms, separate blocks), each made up...