Filters








17 Hits in 12.3 sec

Asynchronous Broadband Signals Are the Principal Source of the BOLD Response in Human Visual Cortex

Jonathan Winawer, Kendrick N. Kay, Brett L. Foster, Andreas M. Rauschecker, Josef Parvizi, Brian A. Wandell
2013 Current Biology  
Activity in the living human brain can be studied using multiple methods, spanning a wide range of spatial and temporal resolutions.  ...  We set out to explain the full set of measurements by modeling the underlying neural circuits. Results: ECoG responses in visual cortex can be separated into two visually driven components.  ...  Acknowledgments This work was supported by NEI grant RO1-EY03164 (B.A.W.), NEI grant K99-EY022116 (J.W.), NIH grant R01-NS0783961 (J.P.), and the Stanford NeuroVentures Program (J.P.).  ... 
doi:10.1016/j.cub.2013.05.001 pmid:23770184 pmcid:PMC3710543 fatcat:6ypeelpwajb4zoofr47c6ygity

Spectral Properties of Induced and Evoked Gamma Oscillations in Human Early Visual Cortex to Moving and Stationary Stimuli

J. B. Swettenham, S. D. Muthukumaraswamy, K. D. Singh
2009 Journal of Neurophysiology  
Spectral properties of induced and evoked gamma oscillations in human early visual cortex to moving and stationary stimuli. .  ...  In two experiments, magnetoencephalography (MEG) was used to investigate the effects of motion on gamma oscillations in human early visual cortex.  ...  In addition, a recent human MEG study showed 50 Hz gamma oscillations in primary visual cortex were modulated by spatial frequency, being tuned to an optimal spatial frequency of ϳ3 cycles per degree (  ... 
doi:10.1152/jn.91044.2008 pmid:19515947 fatcat:qhqmaabunfhx3oi55xjmtwvay4

Understanding face perception by means of human electrophysiology

Bruno Rossion
2014 Trends in Cognitive Sciences  
This approach has recently provided face perception thresholds and the first objective signature of integration of facial parts in the human brain.  ...  The time window between 100 and 200 ms witnesses the transition between low-level and high-level vision, an N170 component correlating with conscious interpretation of a visual stimulus as a face.  ...  I thank Talia Retter and two anonymous reviewers for their helpful comments on a previous version of this paper.  ... 
doi:10.1016/j.tics.2014.02.013 pmid:24703600 fatcat:rmjimaagtrgdhm2k6kkjlur7ne

Attention Reduces Spatial Uncertainty in Human Ventral Temporal Cortex

Kendrick N. Kay, Kevin S. Weiner, Kalanit Grill-Spector
2015 Current Biology  
gain, eccentricity, and size in highbut not low-level areas d Attention improves the quality of spatial representations in VTC In Brief Kay et al. tackle the problem of modeling the final stage in the  ...  They show that attention reduces uncertainty in the peripheral visual field where humans and primates are the worst at seeing.  ...  Witthoft for assisting in the collection of face photographs.  ... 
doi:10.1016/j.cub.2014.12.050 pmid:25702580 pmcid:PMC4348205 fatcat:5hlmhf5henhhhpayhkjhkkvg7i

The steady-state visual evoked potential in vision research: A review

Anthony M. Norcia, L. Gregory Appelbaum, Justin M. Ales, Benoit R. Cottereau, Bruno Rossion
2015 Journal of Vision  
Periodic visual stimulation and analysis of the resulting steady-state visual evoked potentials were first introduced over 80 years ago as a means to study visual sensation and perception.  ...  The purpose of this article is to describe the fundamental stimulation paradigms for steady-state visual evoked potentials and to illustrate these principles through research findings across a range of  ...  Acknowledgments This work was supported by EY018875 and  ... 
doi:10.1167/15.6.4 pmid:26024451 pmcid:PMC4581566 fatcat:jnceo7xj4vbx7eara4k4jfwonm

Sensation transference from plateware to food: The sounds and tastes of plates

Yi-Chuan Chen, Andy T. Woods, Charles Spence
2018 The International Journal of Food Design  
Hubel and Wiesel, Nobel Laureates in 1981, were the first to discover that columns exist in the visual cortex representing left and right eye inputs (ocular dominance columns), and they also found that  ...  Short-term visual deprivation in adults improves sensitivity of the deprived eye and reduces sensitivity of the non-deprived eye, allowing the two eyes' inputs to be rebalanced at the level of binocular  ...  Brain Activities in Visual Perception in Peripheral Visual Field Is Modulated by Eccentric Gaze Ryoichi Nakashima The University of Tokyo, Japan Email: rnaka@l.u-tokyo.ac.jp Visual perception can be  ... 
doi:10.1386/ijfd.3.1.41_1 fatcat:k6ftuwjokfbbbh6zygz5b4eowq

27th Annual Computational Neuroscience Meeting (CNS*2018): Part One

2018 BMC Neuroscience  
Acknowledgement This project was supported by the GSU Brains and Behavior program Acknowledgements We would like to most importantly thank all our subjects who participated in these studies.  ...  Acknowledgements This work has been supported by the Creative Unit I-See of the University of Bremen and the BMBF, Bernstein Award Udo Ernst, Grant No. 01GQ1106.  ...  In parallel, we ran an experiment where human participants were asked to adjust a probe pure tone to match the pitch elicited by a short FM sweep.  ... 
doi:10.1186/s12868-018-0452-x pmid:30373544 pmcid:PMC6205781 fatcat:xv7pgbp76zbdfksl545xof2vzy

Brain–Computer Interfaces for Human Augmentation

Davide Valeriani, Caterina Cinel, Riccardo Poli
2019 Brain Sciences  
The field of brain–computer interfaces (BCIs) has grown rapidly in the last few decades, allowing the development of ever faster and more reliable assistive technologies for converting brain activity into  ...  Acknowledgments: Gabor Aranyi and Fred Charles had an essential contribution to the proof-of-concept experiments whose results are discussed in Section 3 of this paper: details of their respective contributions  ...  Acknowledgments: This research was supported by the European Fund for Regional Development (EFRD-or EFRE in German) under Grants GE-1-1-047 and IT-1-2-001.  ... 
doi:10.3390/brainsci9020022 pmid:30682766 pmcid:PMC6406539 fatcat:4kjekrytqrcd7h4egrqlxsdbpq

XXVth CANADIAN CONGRESS OF NEUROLOGICAL SCIENCES - Program and Abstracts

1990 Canadian Journal of Neurological Sciences  
In contrast thenar and tibial motor evoked potentials (MEPs) elicited by transcranial magnetic stimulation (TMS) and F waves were delayed.  ...  A total of 109 sensory evoked potential (20 electroretinogram[ERG], 61 visual evoked potential[VEP] and 28 auditory brainstem response[ABR]) studies were performed in 27 children with defined cerebral  ...  Chronic papillocdema might constitute a threat of permanent visual loss and therefore prolonged follow up with serial visual fields, acuity and evoked potentials is imperative.  ... 
doi:10.1017/s0317167100030468 fatcat:ytncpxstyzcrtbwfojwawiwyoa

TOWARDS STEADY-STATE VISUALLY EVOKED POTENTIALS BRAIN-COMPUTER INTERFACES FOR VIRTUAL REALITY ENVIRONMENTS EXPLICIT AND IMPLICIT INTERACTION [article]

ENRICO CALORE
2014
Steady-State Visually Evoked Potentials Any change in the visual field content can elicit in an human brain what is called a transient visual evoked potential (tVEP or simply VEP).  ...  Steady State Visual Evoked Potentials An Evoked Potential (EP), in the context of EEG signals, is an electrical potential elicited by the presentation of a stimulus that can be recorded from the nervous  ... 
doi:10.13130/calore-enrico_phd2014-03-18 fatcat:7si4se6tyrchtmtqdbz56smdeq

A Multifaceted Approach to Covert Attention Brain-Computer Interfaces

Christoph Schneider
2018
CVSA is an internal action which can be described as shifting one's attention to the visual periphery without moving the actual point of gaze.  ...  Secondly, I successfully combined data from the EEG with measures of pupil size changes, induced by a high illumination contrast between the covertly attended target regions, which resulted in an improved  ...  Since this response is involuntary and cannot be modulated, an extension of that phenomenon is used for BCI, the steady state visually evoked potential (SSVEP).  ... 
doi:10.5075/epfl-thesis-9052 fatcat:ddtneh55ibaltb3y7za5c7znby

How dirty is the quick and dirty pathway? early spatiotemporal dynamics for the processing of biologically relevant stimuli

Lore Legrand, Alan Pegna
2014
None of the funding sources had any involvement in the study design; collection, analysis and interpretation of the date, nor the decision to submit the paper for publication.  ...  Friedler for use of his photographs of bodies for this study. Jan Van den Stock is a post-doctoral researcher supported by FWO-Vlaanderen (1.5.072.13N).  ...  show less habituation as assessed by visual steady state evoked potential changes compared to neutral faces, lending support for an emotional feedback loop sustaining processing in cortical areas (Gerlicher  ... 
doi:10.13097/archive-ouverte/unige:95043 fatcat:ytk6e2vuyna4dlcpb6xzm6m7uu

Parameter Optimization for Brain-Computer Interfaces based on Visual Evoked Potentials

Felix Gembler
2020
One of the control paradigms used to realize BCIs is based on visual evoked potentials (VEPs), which appear in the visual cortex of the brain when visual stimuli are perceived.  ...  An example of such stimuli is flickering target objects on a computer screen, each flashing with a specific frequency.  ...  'Generating Visual Flickers for Eliciting Robust Steady-State Visual Evoked Potentials at Flexible Frequencies Using Monitor Refresh Rate'. In: PLoS ONE .  ... 
doi:10.4119/unibi/2948847 fatcat:h3hdouqygfg47fuoto2f247v7a

Decoding implicit information from the electroencephalogram with methods from brain-computer interfacing [article]

Markus Wenzel, Technische Universität Berlin, Technische Universität Berlin, Benjamin Blankertz
2017
A neural workload, which is potentially uncomfortable on the long-term, was imposed by the device on the brain of the user, but could not be noticed by test persons due to the limits of human perception  ...  This direct access to the neural processes potentially provides an opportunity to learn about the users of technical applications in a novel way.  ...  Other approaches exploit 'steady state' or 'code modulated' visually or auditory evoked potentials that can be regulated by selective attention [Sutter, 1984; Cheng et al., 2002; Farquhar et al., 2008  ... 
doi:10.14279/depositonce-6053 fatcat:mvsw2qsa3rfdvmugh66bqdbc3q

Investigation of electrical stimulation of the optic nerve for artificial vision

Vivien Gaillet
2021
Finally, thanks to the organization of the optic nerve axonal fibers, it may likely result in the activation of axons originating from the same region of the visual field.  ...  pattern amongst ten and eight total potential stimuli.  ...  They then enter the pupil, the eye's aperture, which diameter can be modulated by the widening or tightening of the iris, the annular structure surrounding it, in order to control the amount of light entering  ... 
doi:10.5075/epfl-thesis-8379 fatcat:wohihwreqfhq5b6ijzk3jknmey
« Previous Showing results 1 — 15 out of 17 results