In visual cognitive neuroscience the debate on consciousness is focused two major topics: search for neural correlates of different properties awareness and controversy graded versus dichotomous nature conscious experience. The aim this study to possible grades investigating Event Related Potentials reduced contrast stimuli whose perceptual clarity was rated four-point Perceptual Awareness Scale. Results revealed a left centro-parietal negative deflection (Visual Negativity; VAN) peaking at...

Blindsight patients can detect, localize and discriminate visual stimuli in their blind field, despite denying being able to see the stimuli. However, literature documents cases of blindsight who demonstrated a preserved degree awareness impaired field. The aim this study is investigate nature processing within field ask whether it reflects pure unconscious behavior or conscious, yet degrade, vision. A hemianopic patient (SL) with complete lesion left primary cortex was tested. SL asked...

Abstract The visual system has long been considered equivalent across hemispheres. However, an increasing amount of data shows that functional differences may exist in this regard. We therefore tried to characterize the emergence perception and spatiotemporal dynamics resulting from stimulation cortices order detect possible interhemispheric asymmetries. Eighteen participants were tested. Each them received 360 transcranial magnetic (TMS) pulses at phosphene threshold intensity over left...

We aimed to establish if the electrophysiological activity resulting from direct stimulation of intraparietal sulcus and eliciting visual percepts is hemispheric-specific. tested nineteen participants. Each received 360 TMS pulses at phosphene threshold intensity over right left IPS while recording EEG. After each pulse, participants had report they seen a phosphene. Parietal perception associated with hemispheric-specific activations: phosphenes elicited by involve central frontal...

The study of the neural substrates that serve conscious vision is one unsolved questions cognitive neuroscience. So far, consciousness literature has endeavoured to disentangle which brain areas and in what order are involved giving rise visual awareness, but problem still remains unsolved. Availing two different complementary sources data (i.e., Fast Optical Imaging EEG), we sought unravel dynamics responsible for emergence a experience. Our results revealed characterized by significant...

Contrastive analysis has been widely employed in the search for electrophysiological neural correlates of consciousness. However, despite its clear logic, it argued that may not succeed isolating processes solely involved emergence perceptual awareness. In fact, data from contrastive would be contaminated by potential confounding factors reflecting distinct, though related, either preceding or following conscious perception. At present, ERP components representing proper awareness still...

(1) Background: Transcranial magnetic stimulation combined with electroencephalography (TMS–EEG) provides a unique opportunity to investigate brain connectivity. However, possible hemispheric asymmetries in signal propagation dynamics following occipital TMS have not been investigated. (2) Methods: Eighteen healthy participants underwent single-pulse at two different EEG sites, corresponding early visual areas. We used state-of-the-art Bayesian estimation approach accurately estimate...

Face recognition deficits are frequently reported in Alzheimer's disease (AD) and often attributed to memory impairment. However, it has been hypothesized that failure identifying familiar people could also be due higher-level perceptual processes, since there is evidence showing a reduced inversion effect for faces but not cars AD. To address the involvement of these higher we investigated event-related potential (ERP) neural correlates patient with AD face deficit. Eight healthy...

Patients with hemianopia can present the so called blindsight phenomenon: ability to perform above chance in absence of acknowledged awareness. Proper awareness reports are, thus, crucial distinguish pure forms from conscious, yet degraded, vision. It has, fact, been recently shown that 1) dichotomous and graded measures assess lead different behavioural results patients 2) grades perceptual clarity show electrophysiological correlates healthy participants. Here, hemianopic patients, we...

The mechanisms of visuospatial attention are mediated by two distinct fronto-parietal networks: a bilateral dorsal network (DAN), involved in the voluntary orientation attention, and ventral (VAN), lateralized to right hemisphere, reorienting unexpected, but relevant, stimuli. present study consisted aims: 1) characterize spatio-temporal dynamics 2) examine predictive interactions between within systems along with visual areas, using fast optical imaging combined Granger causality. Data were...

Introduction Low frequency (1 Hz) repetitive transcranial stimulation (rTMS) applied over right posterior parietal cortex (rPPC) has been shown to reduce cortical excitability both of the stimulated area and interconnected contralateral homologous areas. In present study, we investigated whole pattern intra- inter-hemispheric cortico-cortical connectivity changes induced by rTMS rPPC. Methods To do so, 14 healthy participants underwent resting state EEG recording before after 30 min at 1 Hz...

Transcranial magnetic stimulation (TMS) of the occipital and parietal cortices can induce phosphenes, i.e. visual sensations light without entering eyes. In this paper, we adopted a TMS-EEG interactive co-registration approach with patient (AM) showing altitudinal hemianopia. Occipital in both hemispheres were stimulated while concurrently recording EEG signal. Results showed that, for all sites, neural activity differentially encoding presence vs. absence conscious experience could be found...

OPINION article Front. Psychol., 30 April 2019Sec. Consciousness Research Volume 10 - 2019 | https://doi.org/10.3389/fpsyg.2019.00965

The goal of this study was to investigate the neurophysiological correlates visual awareness, with a specific focus on its event-related spectral perturbation (ERSP) features. To aim, we tried disentangle proper neural consciousness (NCC) from other prerequisite and post-perceptual processing. do so, administered an orientation discrimination task, inducing response bias through task instructions. EEG results showed that different frequency bands are involved in kind temporal dynamics. In...

Obiettivo del paper Il presente lavoro si propone di approfondire il rapporto tra assetti d’impresa familiare e performance. Particolare risalto viene attribuito all’impatto proprieta, controllo management nella determinazione dei risultati dell’impresa. Metodologia Le ipotesi sono testate su un campione 33 studi internazionali selezionati nei database piu rilevanti per la ricerca nel campo delle scienze sociali tramite metodologia della systematic review. Risultati (1) imprese familiari non...