A5004974136- Visual perception and processing mechanisms
- Neural dynamics and brain function
- Face Recognition and Perception
- Neural and Behavioral Psychology Studies
- Visual Attention and Saliency Detection
- Functional Brain Connectivity Studies
- Advanced Vision and Imaging
- Image Processing Techniques and Applications
- CCD and CMOS Imaging Sensors
- Retinal Development and Disorders
- Color Science and Applications
- Image and Object Detection Techniques
- Color perception and design
- Optical measurement and interference techniques
- Face recognition and analysis
- Robotics and Sensor-Based Localization
- Ophthalmology and Visual Impairment Studies
- Cell Image Analysis Techniques
- Neurobiology and Insect Physiology Research
- Supply Chain and Inventory Management
- Mobile Crowdsensing and Crowdsourcing
- Image and Signal Denoising Methods
- Auction Theory and Applications
- Aesthetic Perception and Analysis
- Optical Imaging and Spectroscopy Techniques
Vanderbilt University
2016-2025
Columbia University
2024
University of Glasgow
2024
Vanderbilt Health
2019-2023
Emory University
2023
Maastricht University
2018
Florida State University
2012
University of Hong Kong
2002-2011
Princeton University
2001-2010
Applied Science and Technology Research Institute
2004
It is debated whether different forms of bistable perception result from common or separate neural mechanisms. Binocular rivalry involves perceptual alternations between competing monocular images, whereas ambiguous figures such as the Necker cube lead to two possible pictorial interpretations. Previous studies have shown that observers can voluntarily control alternation rate both and reversal, perhaps suggesting results a mechanism top-down selection. However, according biased competition...
We report evidence from visual search that people can develop robust representations for highly overlearned faces. When observers searched their own face versus the of an unfamiliar observer, slopes and intercepts revealed consistently faster processing self than stranger. These advantages persisted even after hundreds presentations atypical profile upside-down views. Observers not only showed rapid asymptotic recognition as target, but could reject more quickly distractor. findings suggest...
We used functional magnetic resonance imaging to study the response properties of human fusiform face area (FFA: Kanwisher, McDermott, & Chun, 1997) a variety face-like stimuli in order clarify role this region. FFA responses were found be (1) equally strong for cat, cartoon and faces despite very different image properties, (2) entire with eyes occluded but weaker shown alone, (3) equal front profile views heads, declining strength as rotated away from view, (4) weakest nonface objects...
Although orientation columns are less than a millimeter in width, recent neuroimaging studies indicate that viewed orientations can be decoded from cortical activity patterns sampled at relatively coarse resolutions of several millimeters. One proposal is these differential signals arise random spatial irregularities the columnar map. However, direct support for this hypothesis has yet to obtained. Here, we used high-field, high-resolution functional magnetic resonance imaging (fMRI) and...
When spatial attention is directed toward a particular stimulus, increased activity commonly observed in corresponding locations of the visual cortex. Does this attentional increase indicate improved processing all features contained within attended or might selectively enhance relevant to observer's task? We used fMRI decoding methods measure strength orientation-selective patterns human cortex while subjects performed either an orientation contrast discrimination task, involving one two...
Can people evaluate phenomenal qualities of internally generated experiences, such as whether a mental image is vivid or detailed? This question exemplifies problem metacognition: How well do know their own thoughts? In the study reported here, participants were instructed to imagine specific visual pattern and rate its vividness, after which they presented with an ambiguous rivalry display that consisted previously imagined plus orthogonal pattern. On individual trials, higher ratings...
Although practice has long been known to improve perceptual performance, the neural basis of this improvement in humans remains unclear. Using fMRI conjunction with a novel signal detection-based analysis, we show that extensive selectively enhances representation trained orientations human visual cortex. Twelve observers practiced discriminating small changes orientation laterally presented grating over 20 or more daily 1 h training sessions. Training on average led twofold discrimination...
If we view a visual scene that contains many objects, then momentarily close our eyes, some details persist while others seem to fade. Discrete models of working memory (VWM) assume only few items can be actively maintained in memory, beyond which pure guessing will emerge. Alternatively, continuous resource all stored with precision. Distinguishing between these competing is challenging, however, as allow for stochastically variable precision (across and trials) produce error distributions...
Abstract Working memory serves as an essential workspace for the mind, allowing active maintenance of information to support short-term cognitive goals. Although people can readily report contents working memory, it is unknown whether they might have reliable metacognitive knowledge regarding accuracy their own memories. We investigated this question better understand core properties visual system. Observers were briefly presented with displays three or six oriented gratings, after which...
Abstract Whenever a visual scene is cast onto the retina, much of it will appear degraded due to poor resolution in periphery; moreover, optical defocus can cause blur central vision. However, pervasiveness blurry or input typically overlooked training convolutional neural networks (CNNs). We hypothesized that absence inputs may CNNs rely excessively on high spatial frequency information for object recognition, thereby causing systematic deviations from biological evaluated this hypothesis...