A5089678857- Visual perception and processing mechanisms
- Color Science and Applications
- Color perception and design
- Multisensory perception and integration
- Tactile and Sensory Interactions
- Neural dynamics and brain function
- Aesthetic Perception and Analysis
- Advanced Vision and Imaging
- Optical measurement and interference techniques
- Visual Attention and Saliency Detection
- Interactive and Immersive Displays
- Advanced Neuroimaging Techniques and Applications
- Neural and Behavioral Psychology Studies
- Retinal Development and Disorders
- 3D Surveying and Cultural Heritage
- Functional Brain Connectivity Studies
- Image Processing and 3D Reconstruction
- 3D Shape Modeling and Analysis
- Face Recognition and Perception
- Advanced MRI Techniques and Applications
- Computer Graphics and Visualization Techniques
- Barrier Structure and Function Studies
- Motor Control and Adaptation
- Image Enhancement Techniques
- Gaze Tracking and Assistive Technology
Justus-Liebig-Universität Gießen
2015-2025
Giessen School of Theology
2019-2024
Bilkent University
2014-2023
Brain (Germany)
2023
Resonance Research (United States)
2009-2022
University of Minnesota
2007-2010
New York University
2004-2010
University of Pennsylvania
2009
The biological basis for the development of cerebro-cerebellar structures required posture and gait in humans is poorly understood. We investigated a large consanguineous family from Turkey exhibiting an extremely rare phenotype associated with quadrupedal locomotion, mental retardation, hypoplasia, linked to 7.1-Mb region homozygosity on chromosome 17p13.1–13.3. Diffusion weighted imaging fiber tractography patients' brains revealed morphological abnormalities cerebellum corpus callosum,...
The light reflected from a glossy surface depends on the reflectance properties of that as well flow in scene, field. We asked four observers to compare glossiness pairs surfaces under two different real-word fields, and used this data estimate transfer function captures how perceived is remapped changing one real-world field second. wished determine form test whether for any set three fields 1 2 3 could be predict 3. Observers' estimated functions sets were best described by linear model....
In early retinotopic areas of the human visual system, information from left and right hemifields (VHFs) is processed contralaterally in two hemispheres. Despite this segregation, we have perceptual experience a unified, coherent, uninterrupted single field. How exactly system integrates VHFs achieves still remains largely unknown. study using fMRI, explored candidate that are involved interhemispheric integration global motion across VHFs. Stimuli were two-dimensional, computer-generated...
We investigated whether people who report different colors for #thedress do so because they have assumptions about the illumination in scene. introduced a spherical probe (Koenderink, Pont, van Doorn, Kappers, & Todd, 2007) into original photograph, placed fore-, or background of scene and-for each location-let observers manipulate probe's chromaticity, intensity and direction illumination. Their task was to adjust such that it would appear as white sphere When located foreground, reported...
Haptic research has frequently equated softness with the compliance of elastic objects. However, in a recent study we have suggested that is not only perceived material dimension underlying what commonly called [ <xref ref-type="bibr" rid="ref1" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><b>1</b></xref> ]. Here, investigate, whether different perceptual dimensions affect how materials are haptically explored. Specifically, tested also task,...
Abstract Recognizing materials and their properties visually is vital for successful interactions with our environment, from avoiding slippery floors to handling fragile objects. Yet there no simple mapping of retinal image intensities physical properties. Here, we investigated what information drives material perception by collecting human psychophysical judgements about complex glossy Variations in specular structure—produced either manipulating reflectance or visual features...
We examined the effect of perceived orientation on color matte surfaces in rendered three-dimensional scenes illuminated by a blue diffuse light and yellow punctate light. On each trial, observers first adjusted test patch, placed near center scene, until it appeared achromatic, then estimated its adjusting monocular gradient probe. The patch was varied from trial to experimental program, effectively varying chromaticity mixture two sources that would be absorbed reemitted neutral patch....
Research on the visual perception of materials has mostly focused surface qualities rigid objects. The substance like is less explored. Here, we investigated contribution of, and interaction between, optics mechanical properties to nonrigid, breaking materials. We created novel animations ranging from soft hard bodies that broke apart differently when dropped. In Experiment 1, were rendered as point-light movies varying in dot density, well "full-cue" optical versions translucent glossy...
Perceived visual balance is one of the critical factors that determine whether an artwork perceived as aesthetically pleasing or not. This kind seems to depend on perceptual weight given major elements a composition can differ in size, position, shape, orientation and colors within pictorial field. We probe relationship between stability, dynamics, aesthetic ratings original compositions from Suprematist art movement participant-arranged with taken artworks. For each twenty-two art-naïve...
Image motion contributes to the perception of visual material properties, and signals are generated during active exploration. However, little is known about how specific perceptual tasks influence actions that generate these cues. In an experiment using virtual reality real-time hand tracking, we investigated demands (e.g., judging gloss or lightness) shape exploratory behaviors. Participants either observed actively explored objects varying in lightness while performing a matching task. We...
In complex scenes, the light absorbed and re-emitted by one surface can serve as a source of illumination for second. We examine whether observers systematically discount this secondary when estimating color. asked six naïve to make achromatic settings small test patch adjacent brightly colored orange cube in rendered scenes. The orientation with respect was varied from trial trial, altering amount reaching patch. Observers took into account making their settings, discounting added more at...
We investigate how human observers make use of three candidate cues in their lightness judgments. Each cue potentially provides information about the spatial distribution light sources complex, rendered 3D scenes. The illumination (lighting model) each scene consisted a punctate source combined with diffuse source. were (1) cast shadows, (2) surface shading, and (3) specular highlights. Observers asked to judge albedo matte grayscale test patch that varied orientation respect tested...
Among other cues, the visual system uses shading to infer 3D shape of objects. The pattern depends on illumination and reflectance properties (BRDF). In this study, we compared perception between identical shapes with different BRDFs. stimuli were photographed printed random smooth that either painted matte gray or had a velvet layer. We used gauge figure task (J. J. Koenderink, A. van Doorn, & M. L. Kappers, 1992) quantify perception. found objects was systematically perceived be flatter...
The softness of objects can be perceived through several senses. For instance, to judge the a cat's fur, we do not only look at it, often also run our fingers its coat. Recently, have shown that haptically covaries with compliance, viscosity, granularity, and furriness materials (Dovencioglu, Üstün, Doerschner, & Drewing, 2020). However, it is unknown whether vision provide similar information about various aspects softness. Here, investigated this question in an experiment three conditions:...
We report the results of three experiments in which observers judged albedo surfaces at different locations rendered, three-dimensional scenes consisting two rooms connected by a doorway. All composing were achromatic and Lambertian, gradient illumination increased with depth. Observers made asymmetric matches between standard surface placed depths along line sight an adjustable fixed location. In Experiment 1, gradients intensity on walls, floor, ceiling scene, as well its structure,...
We investigated how spatial pattern, background, and dynamic range affect perceived gloss in brightly lit real scenes. Observers viewed spherical objects against uniform backgrounds. There were three possible objects. Two black matte spheres with circular white dots painted on them (matte-dot spheres). The third sphere was glossy (glossy sphere). Backgrounds either or matte, observers saw each of the turn background. Scenes illuminated by an intense collimated source. On trial, matched...
Haptic research has traditionally often equated softness with compliance. However, in a recent study we have suggested that compliance is not the only perceived object dimension underlying what commonly called [1]. Here, investigate how different perceptual dimensions of affect materials are haptically explored. Participants freely explored and rated 19 on 15 adjectives. The adjectives defined tasks by being associated dimensions. Materials were chosen to represent extreme values separately...
Extension and characteristics of WM involvement other than the brain stem remain inadequately investigated in ARSACS. The aim this study was to investigate whole-brain alterations patients with ARSACS.Nine Turkish unrelated ARSACS 9 sex- age-matched healthy control participants underwent neurologic examination, molecular studies, electrophysiologic DTI brain. TBSS used for voxelwise analysis FA, AD, RD, mean diffusivity WM. Tractographies CST TPF were also computed.Molecular studies revealed...
Our experience of materials does not merely comprise judgments single properties such as glossiness or roughness but is rather made up a multitude simultaneous impressions qualities. To understand the neural mechanisms yielding complex impressions, we suggest that it necessary to extend existing experimental approaches those view material perception distributed and dynamic process. A representations framework only fits better with our perceptual qualities, commensurate recent psychophysics...
The light reflected from a glossy surface depends on the reflectance properties of that as well spatial distribution sources in scene. We asked observers to compare glossiness pairs surfaces rendered under two different Debevec (1998) real-world illuminants (DIs). used this data estimate transfer function captures how perceived is remapped changing one DI second. wished determine form function, test whether it was linear, and whether, for any set three illuminants, DI1 DI2 DI3 could be...