Several studies have demonstrated that prestimulus occipital alpha-band activity substantially influences subjective perception and discrimination of near-threshold or masked visual stimuli. Here, we studied the role power fluctuations in two phenomena called double-flash illusion (DFI) fusion effect (FE), both consisting suprathreshold In phenomena, human subjects' varies on a trial-by-trial basis between perceiving one stimuli, despite constant stimulation. FE, stimuli correspond to...

Biological motion perception is the compelling ability of visual system to perceive complex human movements effortlessly and within a fraction second. Recent neuroimaging neurophysiological studies have revealed that biological activates widespread network brain areas. The superior temporal sulcus has crucial role this network. roles other areas are less clear. We present computational model based on neurally plausible assumptions elucidate contributions form signals computations in...

Significance Our sensory system constantly receives multiple inputs, which are usually perceived as a seamless stream. Thus, perception is commonly regarded continuous process. Alternatively, few phenomena and recent studies suggest that might work in discrete periodic sampling mode. In human magnetoencephalography study, we challenged the common view of perception. We demonstrate neuronal oscillations alpha band low beta determine perceptual windows primary somatosensory cortex. The current...

Recent studies have demonstrated that prestimulus alpha-band activity substantially influences perception of near-threshold stimuli. Here, we studied the influence alpha power fluctuations on temporal perceptual discrimination suprathreshold tactile stimuli and subjects' confidence regarding their decisions. We investigated how poststimulus decision-making variables. presented electrical with different stimulus onset asynchronies (SOAs) to human subjects, determined SOA for which varied a...

Neuronal oscillatory activity in the beta band (15-30 Hz) is a prominent signal within human sensorimotor cortex. Computational modeling and pharmacological modulation studies suggest an influence of GABAergic interneurons on generation oscillations. Accordingly, humans have demonstrated correlation between GABA concentrations power It remains unclear, however, if also peak frequencies whether this present cortex at rest without modulation. In study, we investigated relation endogenous...

Biological motion perception is referred to as the ability recognize a moving human figure from no more than few point lights. Such point-light stimuli contain limited form information about shape of body and local image signals points. The contributions vivid displays are subject controversy in discussion. While some studies claim that critical, others emphasize role global cues. Here, we present template-matching approach investigate analysis. We used method derives biological exclusively...

Oscillatory activity is modulated by sensory stimulation but can also fluctuate in the absence of input. Recent studies have demonstrated that such fluctuations oscillatory substantial influence on perception subsequent stimuli. In present study, we employed a simultaneity task somatosensory domain to study role prestimulus temporal 2 events. Subjects received electrical stimulations left and right index finger with varying stimulus onset asynchronies (SOAs) reported their subjective...

Understanding encoded language, such as written words, requires multiple cognitive processes that act in a parallel and interactive fashion. These their interactions, however, are not fully understood. Various conceptual methodical approaches including computational modeling neuroimaging have been applied to better understand the neural underpinnings of these complex human brain. In this study, we tested different predictions cortical interactions derived from models for reading using...

Point-light biological motion stimuli provide spatio-temporal information about the structure of human body in motion. Manipulation spatial point-light reduces ability observers to perceive A recent study has reported that interference with pointlight walkers also evoked eventrelated potentials over occipitotemporal cortex, but temporal event-related similar normal stimuli. We systematically investigated influence and manipulation on 2 common discrimination tasks compared it predictions a...

Prosopagnosia is a deficit in recognizing people from their faces. Acquired prosopagnosia results after brain damage, developmental or congenital (CP) not caused by lesion, but has presumably been present early childhood onwards. Since other sensory, perceptual, and cognitive abilities are largely spared, CP considered to be stimulus-specific deficit, limited face processing. Given that recent behavioral imaging studies indicate close relationship of biological-motion perception healthy...

Abstract Neuronal oscillations refer to periodic changes of neuronal activity. A prominent oscillation, especially in sensorimotor areas, is the beta-frequency-band (∼ 13–29 Hz). Sensorimotor beta are predominantly linked motor-related functions such as preparation and/or execution movements. In addition, have been suggested play a role long-range communication between multiple brain areas. this review, we assess different studies that show additionally involved visual perception and imagery...

Abstract We perceive our surrounding as a continuous stream of information. Yet, it is under debate, whether brain processes the incoming information continuously or rather in discontinuous way. In recent years, idea rhythmic perception has regained popularity, assuming that parieto-occipital alpha oscillations are neural mechanism defining rhythmicity visual perception. Consequently, behavioural response should also fluctuate rhythm (i.e., at ~ 10 Hz). To test this hypothesis, we employed...

Abstract Transcranial Alternating Current Stimulation (tACS) appears to modulate neuronal oscillations at the frequency of stimulation. Longer periods stimulation with tACS (10-40 minutes) have shown produce persistent changes, especially in alpha power (~ 8-12 Hz), whereas efficacy shorter (1-8 seconds) is less known. Thus, we investigated whether short applied somatosensory cortex elicits changes following With this aim, during simultaneous acquisition MEG, administered and control...

Recent studies have proposed a connection between the individual alpha band peak frequency and temporal resolution of visual perception in healthy human participants. This rests on animal describing oscillations as mode phasic thalamocortical information transfer for low-level stimuli, which critically relies GABAergic interneurons. Here, we investigated interplay these parameters by measuring occipital means magnetoencephalography, behavioral testing, GABA levels magnetic resonance...

Abstract Despite being experienced as continuous, there is an ongoing debate if perception intrinsically discrete process, with incoming sensory information treated a succession of single perceptual cycles. Here, we provide causal evidence that somatosensory composed We used in humans electrotactile temporal discrimination task preceded by subliminal (i.e., below threshold) stimulus. Although not consciously perceived, stimuli are known to elicit neuronal activity early areas and modulate...

The cortical network for action observation includes areas of the visual cortex and non-visual areas, including motoric system. Parts this are known their contralateral organization during motion execution, i.e., they predominantly control respond to movements body side. We were interested whether lateralized was also present observation. Human participants viewed point-light displays human actors, where actor facing moving either right or left, while participants' neuromagnetic activity...

Several studies have shown activation of the mirror neuron system (MNS), comprising temporal, posterior parietal, and sensorimotor areas when observing plausible actions, but far less is known on how these cortical interact during recognition a action. Here, we recorded neural activity with magnetoencephalography while subjects viewed point‐light displays biologically scrambled versions actions. We were interested in modulations oscillatory and, specifically, coupling between visual motor...