When a red star is placed in the middle of an Ehrenstein figure so as to be collinear with the surrounding black rays, a reddish veil is perceived to fill the white center. This is called neon color spreading. To better understand the processes that give rise to this phenomenon, we studied the temporal properties of the effect. Specifically, we presented a "sustained" black Ehrenstein figure (rays) for 600 ms and a "transient" red star for 48 ms, or the converse pattern, at various stimulus onset asynchronies (-100-700 ms) and asked subjects to compare the strength of the neon color in the test stimulus to that of a reference pattern in which the transient star had an onset asynchrony of 300 ms. Additional exposure durations of 24 and 96 ms were used for each transient stimulus in order to study the effect of temporal integration. Simultaneity of the on- and off-transients of the star and the Ehrenstein rays were found to optimize neon color spreading, especially when both stimuli terminated together. Longer exposure durations of the transient stimulus up to 96 ms further improved the effect. Neon color spreading was much reduced when the transient stimulus was presented soon after the beginning of the sustained stimulus, with a gradual build-up towards the end. These results emphasize the importance of stimulus onset asynchrony (SOA) and stimulus termination asynchrony (STA) for the perception of neon color spreading.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1167/13.12.2 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Predicting 1, 2 and 3 year emergent referable diabetic retinopathy and maculopathy using deep learning.
Commun Med (Lond)
August 2024
Section of Ophthalmology, Faculty of Life Sciences and Medicine, King's College London, London, UK.
Background: Predicting diabetic retinopathy (DR) progression could enable individualised screening with prompt referral for high-risk individuals for sight-saving treatment, whilst reducing screening burden for low-risk individuals. We developed and validated deep learning systems (DLS) that predict 1, 2 and 3 year emergent referable DR and maculopathy using risk factor characteristics (tabular DLS), colour fundal photographs (image DLS) or both (multimodal DLS).
Methods: From 162,339 development-set eyes from south-east London (UK) diabetic eye screening programme (DESP), 110,837 had eligible longitudinal data, with the remaining 51,502 used for pretraining.
Psychophysics of neon color spreading: Chromatic and temporal factors are not limiting.
Vision Res
October 2024
Department of Psychology, College of Science, Northeastern University, Boston, MA, USA. Electronic address:
Neon color spreading (NCS) is an illusory color phenomenon that provides a dramatic example of surface completion and filling-in. Numerous studies have varied both spatial and temporal aspects of the neon-generating stimulus to explore variations in the strength of the effect. Here, we take a novel, parametric, low-level psychophysical approach to studying NCS in two experiments.
View Article and Find Full Text PDFAcriflavine Is More than It Seems: Resolving Optical Properties of Multiple Isomeric Constituents at 5 K.
J Phys Chem Lett
July 2024
Institute of Physical Chemistry II, Karlsruhe Institute of Technology, Fritz-Haber-Weg 2, 76131 Karlsruhe, Germany.
Ion mobility spectrometry at room temperature was combined with vibrationally resolved electronic spectroscopy of mass-selected ions at 5 K to study the well-known cationic fluorophore acriflavine. One- and two-color photodepletion action spectra recorded in gas-phase (by helium tagging) as well as dispersed fluorescence spectra obtained in neon matrix (after soft-landing deposition) indicate that the primary cation mass electrosprayed from solution comprises two isomers with different optical properties. Theory at the TD-DFT level allowed full spectral assignment.
View Article and Find Full Text PDFFluorescent proteins generate a genetic color polymorphism and counteract oxidative stress in intertidal sea anemones.
Proc Natl Acad Sci U S A
March 2024
Marine Biology Research Division, Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA 92037.
Article Synopsis
- Fluorescent proteins (FPs) are widely used in research, but their natural roles are not well understood; this study focuses on intertidal sea anemones and how FPs contribute to color variation and response to oxidative stress.
- The research highlights that a specific green color morph of FP is linked to different alleles of a single gene, which enhances both color vibrancy and antioxidant capacity.
- By modeling the amino acids involved, the study proposes that the antioxidant properties of FPs are influenced by their molecular surface charge, showing how a single FP can serve multiple functions in nature.
The dwarf neon rainbowfish Melanotaenia praecox, a small spiny-rayed fish with potential as a new Acanthomorpha model fish: I. Fin ray ontogeny and postembryonic staging.
Dev Dyn
September 2024
Department of Ecological Developmental Adaptability Life Sciences, Graduate School of Life Sciences, Tohoku University, Sendai, Japan.
Background: Fish fins with highly variable color patterns and morphologies have many functions. In Actinopterygii, the free parts of fins are supported by "soft rays" and "spiny rays." Spiny rays have various functions and are extremely modified in some species, but they are lacking in popular model fish such as zebrafish and medaka.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!