A5087017920- Visual perception and processing mechanisms
- Color perception and design
- Multisensory perception and integration
- Ophthalmology and Visual Impairment Studies
- Color Science and Applications
- Neural dynamics and brain function
- Ocular and Laser Science Research
- Neural and Behavioral Psychology Studies
- Glaucoma and retinal disorders
- Visual Attention and Saliency Detection
- Categorization, perception, and language
- Astrophysics and Star Formation Studies
- Tactile and Sensory Interactions
- Stellar, planetary, and galactic studies
- Olfactory and Sensory Function Studies
- Advanced Optical Imaging Technologies
- Spatial Cognition and Navigation
- Astronomy and Astrophysical Research
- Neuroscience and Music Perception
- Geological and Geophysical Studies
- Design Education and Practice
- Astrophysics and Cosmic Phenomena
- Smart Agriculture and AI
- Ion Transport and Channel Regulation
- Advanced Image Fusion Techniques
National Cheng Kung University
2015-2024
National Central University
2016-2022
McGill University
2004-2018
National Taiwan University
2002-2014
China Medical University
2012
Abstract We developed a dichoptic global orientation coherence paradigm to quantify interocular suppression in amblyopia. This task is biased towards ventral processing and allows comparison with two other techniques—global motion processing, which more dorsally biased, binocular phase combination, most likely reflects striate function. found similar pattern for the relationship between threshold contrast curves (thresholds vs. ratios or TvRs) our new compared those of previous paradigm. The...
Abstract It has been suggested that the Bouba/Kiki effect, in which meaningless speech sounds are systematically mapped onto rounded or angular shapes, reflects a universal crossmodal correspondence between audition and vision. Here, radial frequency (RF) patterns were adapted order to compare effect Eastern Western participants demonstrating different perceptual styles. Three attributes of RF manipulated: The frequency, amplitude, spikiness sinusoidal modulations along circumference circle....
The human visual system is sensitive to both luminance (first-order) and contrast (second-order) modulations in an image. A linear-nonlinear-linear model commonly used explain processing of second-order patterns. Here we a pattern-masking paradigm compare first-order mechanisms characterize the nonlinear properties underlying them. carriers were either high-frequency horizontal grating (8 c/°) or binary random dot pattern; they added vertical low-frequency (2 sinusoidal (first-order stimuli)...
Abstract We measured the properties of interocular suppression in strabismic amblyopes and compared these to dichoptic masking binocularly normal observers. used a version well-established probed-sinewave paradigm that sensitivity brief target stimulus (one four letters be discriminated) amblyopic eye at different times relative suppression-inducing mask fixing eye. This was done using both sinusoidal steady state transient approaches. The masks were either modulations luminance or contrast...
We present long-term photometric observations of the young open cluster IC 348 with a baseline time-scale 2.4 yr. Our study was conducted several telescopes from Young Exoplanet Transit Initiative (YETI) network in Bessel $R$ band to find periodic variability stars. identified 87 stars be periodically variable; 33 them were unreported before. Additionally, we detected 61 non-members which 41 are new discoveries. wide field view key those numerous newly found variable The distribution...
We investigated how two co-aligned adjacent stimuli (flankers) influence threshold versus pedestal contrast (TvC) functions in binocular, monocular, and dichoptic presentations. Targets were presented to the eyes or only one eye. Pedestals flankers same eye which target was (binocular monocular presentations) other (dichoptic presentation). In binocular presentation of targets pedestals, lowered thresholds at low contrasts. The had a similar effect flanker, although reduction smaller....
In 2015 July 29 - September 1 the satellite XMM-Newton pointed at BL Lac object PG 1553+133 six times, collecting data for 218 hours. During one of these epochs, simultaneous observations by Swift were requested to compare results X-ray and optical-UV instruments. Optical, near-infrared radio monitoring was carried out Whole Earth Blazar Telescope (WEBT) collaboration whole observing season. We here present analysis all data, together with an investigation source photometric polarimetric...
Purpose.: Amblyopia is a developmental abnormality of visual cortex characterized by spatial processing deficits. Recently, it has been suggested that temporal also affected. We investigated sensitivity measuring synchrony sensitivity. Methods.: In Experiment 1, we used contrast detection task to compare the flickering 3 Hz Gaussian blob discrimination for 180° phase shift. 2, measured thresholds directly assessing minimum degree asynchrony allowed subjects discriminate which 4 high-contrast...
We examined the crossmodal effect of presentation a simultaneous sound on visual detection and discrimination sensitivity using equivalent noise paradigm (Dosher Lu, 1998). In each trial, tilted Gabor patch was presented in either first or second two intervals embedded dynamic 2D white with one seven possible contrast levels. The results revealed that participants' performance were both enhanced by sound, though only close to level at which target thresholds started increase increasing...
The detection of a luminance-defined Gabor is improved by two high contrast, aligned, flanking Gabors, an effect termed collinear facilitation. We investigate whether this facilitation also occurs for isoluminant chromatic stimuli, and it can occur targets with luminance flanks vice versa. measured stimuli (0.75 cpd, 1 octave bandwidth) three different contrast types: achromatic, red-green that isolates the L/M-cone opponent mechanism, blue-yellow S-cone mechanism. Three conditions were...
The detection threshold of a Gabor target can be reduced by the presence collinear flanking Gabors but is disrupted when and flankers have different disparity. Here, we further investigated whether it depth or surface difference between flanker that causes abolition facilitation. were 1.6 cycle per degree vertical patches with separation three wavelength units them. There six viewing conditions: set (A) in same frontoparallel plane configuration, (B) at disparities embedded slanted plane,...
Abstract This study delves into expressing primary emotions anger, happiness, sadness, and fear through drawings. Moving beyond the well-researched color-emotion link, it explores under-examined aspects like spatial concepts drawing styles. Employing Python OpenCV for objective analysis, we make a breakthrough by converting subjective perceptions measurable data 728 digital images from 182 university students. For prominent color chosen each emotion, majority of participants chose red anger...
A recent series of experiments demonstrated a surprising deterioration visual motion discrimination with increasing stimulus size for stimuli high contrast. This counterintuitive finding was explained as result surround suppression in area V5. Equally paradoxical the that older observers showed better performance than younger observers. second an age-related reduction due to changes GABA-mediated inhibition. Using opponent stimulus, we find analogous effect and also this is much reduced...
To assess the effects of spatial frequency and phase alignment mask components in pattern masking, target threshold vs. contrast (TvC) functions for a sine-wave grating (S) were measured five types mask: (S), square-wave (Q), missing fundamental (M), harmonic complexes consisting phase-scrambled harmonics square wave (Qp), (Mp). Target masks had same (0.46 cpd) was added with component mask. Under monocular viewing conditions, strength masking depends on relationships among frequencies far...
We investigate temporal synchrony within one eye and between both eyes in adults with amblyopia.Eight adult amblyopes (range, 19.88-27.81 years old; median, 22.86 old) 12 age-matched normal vision 21.2-50.30 23.78 participated the experiment. showed two pairs of Gaussian blobs flickering at 1 Hz as visual stimuli, pair same phase modulation (i.e., reference) another a distinct signal). employed constant stimuli method to measure minimum degree (temporal threshold), which participants were...
Abstract Purpose To evaluate whether temporal synchrony processing deficits remain when normal visual acuity is restored in adults with unilateral anisometropic amblyopia. Methods We recruited 14 clinically treated amblyopes (mean age 23.17 ± 2.53 years) best‐corrected ≤ 0.1 logMAR and 15 age‐matched emmetropes 24.40 1.92 vision to participate our experiment. presented two pairs of flicking Gaussian dots (1 Hz) as stimuli: one pair was synchronous (reference), the other asynchronous...
UX Orionis stars (UXors) are Herbig Ae/Be or T Tauri exhibiting sporadic occultation of stellar light by circumstellar dust.GM Cephei is such a UXor in the young (∼ 4 Myr) open cluster Trumpler 37, showing prominent infrared excess, emission-line spectra, and flare activity.Our photometric monitoring (2008)(2009)(2010)(2011)(2012)(2013)(2014)(2015)(2016)(2017)(2018) detects (1) an ∼3.43 day period, likely arising from rotational modulation surface starspots, (2) brightening on time scales...
Fuzzy approaches were used to determine optimal thresholding values of fruit's images, and fuzzy degree matching was applied classify the color size fruit. Results showed that method superior traditional statistical methods, a accuracy 93.3% for combined sorting reported. The errors due miscategorization could thus be reduced if methods used. developed algorithms integrated with machine vision guided robotic system fruits.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML"...