Results 31 to 40 of about 1,757,364 (306)

Motion processing deficits in migraine are related to contrast sensitivity

, 2012
Background: There are conflicting reports concerning the ability of people with migraine to detect and discriminate visual motion. Previous studies used different displays and none adequately assessed other parameters that could affect performance, such ...
Hine, Trevor, Shepherd, Alex J., Hine, T.J., Shepherd, Alex J, Beaumont, Heidi M, Shepherd, Alex, Hine, Trevor J, Beaumont, H.M., Beaumont, Heidi   +8 more
core   +1 more source

Spatial Frequency Discrimination of Band-limited Periodic Targets: Effects of Stimulus Contrast, Bandwidth and Retinal Eccentricity [PDF]

, 1992
Two experiments were conducted to explore the ability of human observers to discriminate the spatial frequency of briefly-presented, Gaussian-truncated sinewave gratings.
Greenlee, Mark W.
core   +1 more source

Evaluating the Use of Contrast Sensitivity Tests By Orthoptists in the UK

British and Irish Orthoptic Journal
Introduction: The importance of the use of contrast sensitivity (CS) tests in orthoptic practice is well established. However, despite the clinical relevance the implementation within clinical care is known to be variable. There are no known studies that
Lowri Jones, Anna O’Connor, Ashli Warburton   +2 more
doaj   +1 more source

Defining human contrast sensitivity and discrimination from complex imagery

, 2013
Shape, form and detail define image structure in our visual world. These attributes are dictated primarily by local variations in luminance contrast.
Gupta, G., Rana, H., S. Triantaphillidou, Triantaphillidou, S., H. Rana, J. Jarvis, G. Gupta, Jarvis, J.   +7 more
core   +1 more source

Sensitivity to Auditory Velocity Contrast [PDF]

Scientific Reports, 2016
AbstractA natural auditory scene often contains sound moving at varying velocities. Using a velocity contrast paradigm, we compared sensitivity to velocity changes between continuous and discontinuous trajectories. Subjects compared the velocities of two stimulus intervals that moved along a single trajectory, with and without a 1 second inter stimulus
Shannon M. Locke, Johahn Leung, Simon Carlile   +2 more
openaire   +2 more sources

Contrast Enhancement Using Sensitivity Model-Based Sigmoid Function

IEEE Access, 2019
For indirect contrast enhancement, researchers have proposed various transformation functions based on histogram equalization and gamma correction.
Seung Park, Yong-Goo Shin, Sung-Jea Ko
doaj   +1 more source

Higher-harmonic adaptation and the detection of squarewave gratings [PDF]

, 1987
Adaptation to a high contrast sinewave grating of 1 c/deg spatial frequency causes a large increase in the contrast threshold for a 1 c/deg test grating, but fails to raise the threshold for a squarewave grating of 0.33 c/deg, although the sensitivity of
Magnussen, S., Greenlee, Mark W., Svein Moagnussen, Mark W. Greenlee   +3 more
core   +1 more source

Venous Thromboembolism in Pediatric Bone Sarcoma Patients: A 10‐Year, Single‐Institution Experience Encompassing the COVID‐19 Pandemic

Pediatric Blood &Cancer, EarlyView.
ABSTRACT Background Osteosarcoma (OS) and Ewing sarcoma (EWS) are the most common primary bone cancers in children, but acute thrombosis is poorly characterized in this population. Our study evaluated the rates of venous thromboembolism (VTE) and associated risk factors in pediatric patients with bone sarcomas treated over a 10‐year period encompassing
Sarah Kappa, Shou Xu, Mark Zobeck, Sarah E. Sartain, Nino Rainusso, Lisa Wang, Nicole Montgomery, Paige Wheaton, Sarah Whittle   +8 more
wiley   +1 more source

Dyschromatopsia and contrast sensitivity changes in COVID-19 patients

Indian Journal of Ophthalmology, 2023
Purpose: To evaluate the alterations in the psycho-physical tests, contrast sensitivity (CS) and hue discrimination (total estimation score, TES) in COVID-19 patients.
Aditi Sharma, Aditya Singh, Yashik Bansal, Aditi Mohan, Ramya Gnanaraj, Pranita Khulbe, Kavita Pangtey, Kaushiki Tripathi, Mohammad Ali Khan, Akshita Sharma, Manish Jain   +10 more
doaj   +1 more source

Modelling contrast sensitivity of discs

Electronic Imaging, 2023
Spatial and temporal contrast sensitivities are typically measured using different stimuli. Gabor patterns are used to measure spatial contrast sensitivity and flickering discs are used for temporal contrast sensitivity. The data from both types of studies is difficult to compare as there is no well-established relationship between the sensitivity to ...
Ashraf, Maliha, Mantiuk, Rafal, Chapiro, Alexandre   +2 more
openaire   +2 more sources