A5045169291- Visual perception and processing mechanisms
- Neural dynamics and brain function
- Neural and Behavioral Psychology Studies
- Face Recognition and Perception
- Visual Attention and Saliency Detection
- Functional Brain Connectivity Studies
- Aesthetic Perception and Analysis
- EEG and Brain-Computer Interfaces
- Image Retrieval and Classification Techniques
- Memory and Neural Mechanisms
- Color perception and design
- Spatial Neglect and Hemispheric Dysfunction
- Remote-Sensing Image Classification
- Neutrino Physics Research
- Particle physics theoretical and experimental studies
- Atomic and Subatomic Physics Research
- Dark Matter and Cosmic Phenomena
- Neural Networks and Applications
- Nuclear physics research studies
- Advanced Neuroimaging Techniques and Applications
- Ophthalmology and Visual Impairment Studies
- Bayesian Methods and Mixture Models
- Transcranial Magnetic Stimulation Studies
- Particle Detector Development and Performance
- Cognitive Science and Mapping
University of Illinois Urbana-Champaign
2015-2024
University of Illinois System
2023
University College London
2001-2005
Princeton University
2005
California Department of Education
2002
University of California, Berkeley
1996-2001
KU Leuven
1999
Argonne National Laboratory
1984
Indiana University Bloomington
1984
Worcester Polytechnic Institute
1984
We often fail to see something that at other times is readily detectable. Because the visual stimulus itself unchanged, this variability in conscious awareness likely related changes brain. Here we show phase of EEG α rhythm measured over posterior brain regions can reliably predict both subsequent detection and stimulus-elicited cortical activation levels a metacontrast masking paradigm. When target presentation coincides with trough an wave, suppressed as early 100 ms after onset,...
REVIEW article Front. Psychol., 19 May 2011Sec. Perception Science volume 2 - 2011 | https://doi.org/10.3389/fpsyg.2011.00099
Human subjects are extremely efficient at categorizing natural scenes, despite the fact that different classes of scenes often share similar image statistics. Thus far, however, it is unknown where and how complex scene categories encoded discriminated in brain. We used functional magnetic resonance imaging (fMRI) distributed pattern analysis to ask what regions brain can differentiate (such as forests vs mountains beaches). Using completely exemplars six for training testing ensured...
What is the relationship between attention and conscious awareness? Awareness sometimes appears to be restricted contents of focused attention, yet at other times irrelevant distractors will dominate awareness. This contradictory has also been reflected in an abundance discrepant research findings leading enduring controversy cognitive psychology. Lavie's load theory suggests that puzzle can solved by considering role perceptual load. Although intrude upon awareness conditions low load,...
Rhythmic events are common in our sensory world. Temporal regularities could be used to predict the timing of upcoming events, thus facilitating their processing. Indeed, cognitive theories have long posited existence internal oscillators whose can entrained ongoing periodic stimuli environment as a mechanism temporal attention. Recently, recordings from primate brains shown electrophysiological evidence for these hypothesized oscillations. We that rhythmic visual entrain neural oscillations...
Humans are remarkably efficient at categorizing natural scenes. In fact, scene categories can be decoded from functional MRI (fMRI) data throughout the ventral visual cortex, including primary parahippocampal place area (PPA), and retrosplenial cortex (RSC). Here we ask whether, where, still decode category if reduce scenes to mere lines. We collected fMRI while participants viewed photographs line drawings of beaches, city streets, forests, highways, mountains, offices. Despite marked...
Inherent correlations between visual and semantic features in real-world scenes make it difficult to determine how different scene properties contribute neural representations. Here, we assessed the contributions of multiple representation by partitioning variance explained human behavioral brain measurements three feature models whose inter-correlations were minimized a priori through stimulus preselection. Behavioral assessments similarity reflected unique from functional model indicating...
Although clinical evidence of spatial attention deficits, such as neglect and extinction, is typically associated with lesions the right temporal-parietal junction, recent has suggested an important role for superior parietal lobe. Two groups patients, selected at junction including temporal gyrus (TPJ group), or involving but not region (PAR performed cued-target detection tasks in 2 experiments. An extinction-like response time pattern was found TPJ PAR group. In addition, both were able...
Distractor interference effects were compared between distractors in the periphery and those placed at fixation. In 6 experiments, authors show that fixation produce larger than peripheral distractors. However, distractor are modulated by perceptual load to same extent as (Experiments 1 2). Experiment 3 showed harder filter out The not due cortical magnification of foveal stimuli 4 5), nor can they be attributed cuing point (Experiment 2), lower predictability or greater location certainty...
This paper reports the first measurement of tensor polarization ${t}_{20}$ in $e\ensuremath{-}d$ elastic scattering. The recoil deuterons was measured for two values momentum transfer, $q=1.74 \mathrm{and} 2.03$ ${\mathrm{fm}}^{\ensuremath{-}1}$, with a high-efficiency polarimeter. results are good agreement reasonable models deuteron.
There is increasing evidence from functional magnetic resonance imaging (fMRI) that visual awareness not only associated with activity in ventral cortex but also the parietal cortex. However, due to correlational nature of neuroimaging, it remains unclear whether this plays a causal role awareness. In experiment presented here we disrupted right or left by applying repetitive transcranial stimulation (rTMS) over these areas while subjects attempted detect changes between two images separated...
Abstract We investigated the dynamics of brain processes facilitating conscious experience external stimuli. Previously, we proposed that alpha (8–12 Hz) oscillations, which fluctuate with both sustained and directed attention, represent a pulsed inhibition ongoing sensory activity. Here tested prediction inhibitory oscillations in visual cortex are modulated by top–down signals from frontoparietal attention networks. measured modulations phase-coherent superficial frontal, parietal,...
How do we know that a kitchen is by looking? Traditional models posit scene categorization achieved through recognizing necessary and sufficient features objects, yet there little consensus about what these may be. However, categories should reflect how use visual information. Therefore, test the hypothesis functions, or possibilities for actions within scene. Our approach to compare human patterns with predictions made both functions alternative models. We collected large-scale category...
Both perceptual load theory and dilution purport to explain when why task-irrelevant information, or so-called distractors are processed. Central both explanations is the notion of limited resources, although theories differ in precise way which those limitations affect distractor processing. We have recently proposed a neurally plausible explanation resources neural competition among stimuli hinders their representation brain. This view capacity can also processing, whereby competitive...
Understanding human-object interactions is critical for extracting meaning from everyday visual scenes and requires integrating complex relationships between human pose object identity into a new percept. To understand how the brain builds these representations, we conducted 2 fMRI experiments in which subjects viewed humans interacting with objects, noninteracting pairs, isolated objects. A number of regions process features interactions, including information lateral occipital (LOC)...
A growing literature suggests that the degree to which distracting information can be ignored depends on perceptual load of task, or extent task exhausts capacity. However, there is currently no a priori definition what constitutes high low load. We propose interactions among cells in visual cortex represent nearby stimuli determine and manipulations designed modulate these competitive spatial should distractor processing. found either spatially separating task-relevant items display placing...