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44 results for “Flicker”
Correlation of Flicker Induced and Flow Mediated Vasodilatation in Patients With Endothelial Dysfunction and Healthy Volunteers.
ClinicalTrials.gov study NCT00432029. IPD Sharing: Not stated. Countries: 1. Publications: 1.
Comparison of Critical Flicker Fusion Versus Automated Visual Fields in the Detection of Early Glaucoma
ClinicalTrials.gov study NCT01076114. IPD Sharing: Not stated. Countries: 1. Publications: 11.
Data from: A flicker of hope: genomic data distinguish Northern Flicker taxa despite low levels of divergence
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Data from: Condition-dependent expression of carotenoid- and melanin-based plumage colour of northern flicker nestlings revealed by manipulation of brood size
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Revisiting a classic hybrid zone: movement of the northern flicker hybrid zone in contemporary times
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Data from: Flickers of speciation? Sympatric color morphs of the arc-eye hawkfish, Paracirrhites arcatus, reveal key elements of divergence-with-gene-flow
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Local recruitment in Northern Flickers is related to environmental factors at multiple scales and provides reproductive benefits to yearling breeders settling close to home
<p>Natal dispersal and local recruitment are affected by factors both intrinsic and extrinsic to juveniles and may affect fitness. Understanding the relationship between dispersal and population density in birds has been hindered by a lack of long-term studies and a focus on resident species has neglected the role of weather operating at large spatial scales. I studied local recruitment and the reproductive consequences of natal dispersal distance within a population of Northern Flickers (<i>Colaptes auratus</i>), a migratory woodpecker. During a field study spanning 16 years in British Columbia, 8272 fledglings were banded and 138 males and 105 females recruited locally. Average annual local recruitment rate for males (3.36%) was greater than for females (2.55%) and propensity to recruit locally was positively correlated with an early hatch date and high body condition. Annual local recruitment was not associated with population density in the year of hatch but was positively correlated with population density in the year of settlement. Local recruitment was also positively correlated with warmer springs during migration consistent with the phenology hypothesis. Among local recruits, natal dispersal distance was independent of the presence of parents and so dispersal was not a behavior to prevent inbreeding. However, settling closer to the natal site led to reproductive benefits in terms of earlier laying dates and better nest success. Therefore, juveniles may gain useful information about the location of nesting substrates, predation risk, and patchy food resources by exploring the landscape around their natal site during the post-fledging period and then settling in the familiar area after returning from migration.</p>
Neural, functional, and aesthetic impacts of spatially heterogeneous flicker: a potential role of natural flicker
<p>Spatially heterogeneous flicker, characterized by probabilistic and locally independent luminance modulations, abounds in nature. It is generated by flames, water surfaces, rustling leaves, and so on, and it is pleasant to the senses. It affords spatiotemporal multistability that allows sensory activation conforming to the biases of the visual system, thereby generating the perception of spontaneous motion and likely facilitating the calibration of motion detectors. One may thus hypothesize that spatially heterogeneous flicker might potentially provide restoring stimuli to the visual system that engage fluent (requiring minimal top-down control) and self-calibrating processes. Here, we present some converging behavioral and electrophysiological evidence consistent with this idea. Spatially heterogeneous (multistable) flicker (relative to controls matched in temporal statistics) reduced posterior EEG (electroencephalography) beta power implicated in long-range neural interactions that impose top-down influences on sensory processing. Further, the degree of spatiotemporal multistability, the amount of posterior beta-power reduction, and the aesthetic responses to flicker were closely associated. These results are consistent with the idea that the pleasantness of natural flicker may derive from its spatiotemporal multistability that affords fluent and self-calibrating visual processing.</p> <p> </p>
Divorce in Northern Flickers
<p>Divorce is widespread among species of birds and may either be an adaptive strategy to secure a better mate or territory or be a non-adaptive result of a failure to maintain the pairbond. I examined the causes and consequences for divorce in the Norther Flicker (<i>Colaptes auratus</i>), a migratory woodpecker with a high annual mortality rate. In a long-term population study of 1793 breeding pairs over 17 years, the within-season divorce rate was 4.6% and the between-season divorce rate was 15.5%. Retained pairs within a season initiated their renest 5 days faster than divorced birds which had no greater fledgling production, suggesting that within-season divorce was making the best of a bad job with severe time constraints. Poor performance in the year prior to divorce was not strongly associated with divorce and analysis of multiple breeding stages revealed that divorcing individuals in the subsequent year had later laying dates, smaller clutches and fewer fledglings than retained pairs but no better performance than widowed individuals. Analyzing the data separately by sex showed that neither males nor females benefitted from divorce. Thus, there is a reproductive cost linked to finding a new partner <i>per se</i>, but no reproductive advantage associated with divorce. New mates after divorce were usually not older (not higher quality) than previous mates, so intrasexual competition was probably not driving partnership splits. The most plausible explanation seems to be a "bet-hedging" hypothesis in which birds re-pair rapidly in spring if their previous mate does not quickly arrive during spring migration. Divorce in Northern Flickers does not appear to be adaptive and future studies on arrival and interactions of individuals in spring will elucidate proximate constraints on relocating the previous partner.</p>
Divorce in Northern Flickers
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Local recruitment in Northern Flickers is related to environmental factors at multiple scales and provides reproductive benefits to yearling breeders settling close to home
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Neural, functional, and aesthetic impacts of spatially heterogeneous flicker: a potential role of natural flicker
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Data from: Northern flickers only work when they have to: how individual traits, population size and landscape disturbances affect excavation rates of an ecosystem engineer
Woodpeckers are considered ecosystem engineers because they excavate tree cavities which are used subsequently by many species of secondary cavity nesters for breeding. Woodpeckers have the choice of excavating a new hole or reusing an existing one, and this propensity to excavate (e) may affect community dynamics but has rarely been investigated. Using 18 years of data on a population of northern flickers Colaptes auratus, I tested six hypotheses to explain the propensity to excavate (e) in a landscape which experienced two types of disturbance: pine beetles and wildfires. Woodpecker age, breeding experience and mate retention had little influence on e which varied between 13-39% annually and averaged 23% for 1843 first nests over the 18 years. Body size and body condition of males and females were not associated with e but rates of excavation declined seasonally, suggesting time rather than energy costs limited excavation effort. Reduced cavity availability mediated through high conspecific density coupled with wildfires triggered relatively high excavation rates, up to 39% but e decreased to baseline levels three years after the landscape disturbances. Nearly 2/3 of males did not excavate in their lifetime but apparently, e is great enough to balance the average rate of cavity tree loss in this forest which is 11% annually. Excavation propensity in flickers is flexible, but the birds reduce their work levels if there is a surplus of holes available.
Gamma Sensory Flicker for Parkinson's Disease Patients With Freezing of Gait
ClinicalTrials.gov study NCT06295458. IPD Sharing: YES. Countries: 1. Publications: 0.
Flicker Fusion Thresholds Between Young and Old Subjects at Various Luminance Levels
ClinicalTrials.gov study NCT03079570. IPD Sharing: NO. Countries: 1. Publications: 0.
Is There a Difference in Flicker Induced Vasodilatation Between Smokers and Non-Smokers?
ClinicalTrials.gov study NCT00431730. IPD Sharing: Not stated. Countries: 1. Publications: 0.
Smartphone Flicker Fusion Test for Patients With Optic Disorders.
ClinicalTrials.gov study NCT03475147. IPD Sharing: NO. Countries: 1. Publications: 0.
Flicker App for Minimal Hepatic Encephalopathy
ClinicalTrials.gov study NCT04415294. IPD Sharing: Not stated. Countries: 1. Publications: 0.
Effect of Breathing a Mixture of 92% Oxygen (O2) + 8% Carbon Dioxide (CO2) on Flicker Induced Blood Flow Changes in Ocular Perfusion
ClinicalTrials.gov study NCT00719342. IPD Sharing: Not stated. Countries: 1. Publications: 0.
40 Hz Flickering for Insomnia in Parkinson's Disease
ClinicalTrials.gov study NCT07323121. IPD Sharing: UNDECIDED. Countries: 0. Publications: 0.
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.