Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview01:02

Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview

7.8K
Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material,  molecules absorb light depending on the energy required for...
7.8K
Variables Affecting Phosphorescence and Fluorescence01:26

Variables Affecting Phosphorescence and Fluorescence

3.9K
Fluorescence and phosphorescence are essential phenomena in fields like analytical chemistry, biological imaging, and materials science, where they detect molecular properties and visualize cellular structures. Understanding the variables that influence these luminescent behaviors is crucial for maximizing accuracy and efficiency in their applications. These variables can broadly be grouped into chemical structure, solvent properties, and external conditions, each playing a distinct role in...
3.9K
Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview01:13

Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview

1.5K
Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
The ATR process begins by directing a beam...
1.5K
Flame Photometry: Overview01:02

Flame Photometry: Overview

2.0K
Flame photometry, also known as flame emission spectrometry, is a technique used for the qualitative and quantitative analysis of elements present in a sample using a flame as the source of excitation energy. The concept of flame photometry was realized in the early 1860s by Kirchhoff and Bunsen, who discovered that specific elements emit characteristic radiation when excited in flames. The first instrument developed for this purpose was used to measure sodium (Na) in plant ash using a Bunsen...
2.0K
Flame Photometry: Lab01:16

Flame Photometry: Lab

1.3K
In a flame photometer, when a solution like potassium chloride is aspirated into the flame, the solvent evaporates, leaving behind dehydrated salt. This salt dissociates into free gaseous atoms in their ground state. Some of these atoms absorb energy from the flame, leading to their excitation. The excited atoms return to the ground state, emitting photons at characteristic wavelengths. Because only electronic transitions are involved, the resulting emission lines are very narrow. The intensity...
1.3K
Influence of Earth's Curvature and Atmospheric Refraction on Leveling01:26

Influence of Earth's Curvature and Atmospheric Refraction on Leveling

1.3K
During leveling, the Earth's curvature and atmospheric refraction introduce deviations in the line of sight from a true horizontal reference. When the line of sight is leveled, it remains perpendicular to the plumb line only at a single point. Beyond this, it deviates due to the Earth’s curvature, represented by the correction C. For a sight distance D, the deviation can be derived using the relationship:This relationship shows that the deviation increases quadratically with distance.
1.3K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Deep learning-based diagnostic classification of multiple sclerosis using multicenter optical coherence tomography data.

Experimental eye research·2026
Same author

Elastic or Stiff? Light or Heavy? Pseudo-Haptic Photograph Interaction for Fabric Perception.

IEEE transactions on haptics·2025
Same author

Changes in illumination color induce powerful illusory rotations.

Journal of the Optical Society of America. A, Optics, image science, and vision·2025
Same author

Seeing the Light: Perception and Discrimination of Illumination Color.

Annual review of vision science·2025
Same author

Tranquil or desolate? A mixed-methods investigation of patient sound experiences, needs and emotions in single patient ICU rooms.

Intensive & critical care nursing·2025
Same author

Invited Session III: Machine Learning and AI Approaches to Retinal Diagnostics: Using AI to predict age, sex and disease from retinal OCT images.

Journal of vision·2025
Same journal

Analysis of human visual experience data.

Journal of vision·2026
Same journal

Pyramid-based Bayesian modeling for high-resolution behavioral analysis.

Journal of vision·2026
Same journal

Sensation without perception: The white whale effect and perceptual blindness in autonomous vehicles.

Journal of vision·2026
Same journal

Gaze behavior during closed-captioned movie viewing adapts to absent audio through more frequent switching between text and scene.

Journal of vision·2026
Same journal

In pursuit of saccade awareness: Limited volitional control and minimal conscious access to catch-up saccades during smooth pursuit eye movements.

Journal of vision·2026
Same journal

Dissociable effects of element-lifetime and stimulus-duration on local and global motion processing: An equivalent noise study.

Journal of vision·2026
See all related articles

Related Experiment Video

Updated: May 2, 2026

Surface Renewal: An Advanced Micrometeorological Method for Measuring and Processing Field-Scale Energy Flux Density Data
09:55

Surface Renewal: An Advanced Micrometeorological Method for Measuring and Processing Field-Scale Energy Flux Density Data

Published on: December 12, 2013

8.6K

Contributed talks II: Characterizing terrestrial illumination: Spectral, angular, spatial, and temporal variability.

Cehao Yu1, Sylvia Pont2, Anya Hurlbert3

  • 1Research Centre for Language, Cognition, and Neuroscience, The Hong Kong Polytechnic University, Hong Kong Special Administrative Region, China.

Journal of Vision
|April 11, 2025
PubMed
Summary
This summary is machine-generated.

Daily light changes affect human biology. This study analyzed outdoor light spectra, finding weather impacts spectral composition and photoreceptor responses, but dawn/dusk light remains key for circadian rhythms.

More Related Videos

Leaf Area Index Estimation Using Three Distinct Methods in Pure Deciduous Stands
00:09

Leaf Area Index Estimation Using Three Distinct Methods in Pure Deciduous Stands

Published on: August 29, 2019

13.4K
Surface Mapping of Earth-like Exoplanets using Single Point Light Curves
06:48

Surface Mapping of Earth-like Exoplanets using Single Point Light Curves

Published on: May 10, 2020

3.4K

Related Experiment Videos

Last Updated: May 2, 2026

Surface Renewal: An Advanced Micrometeorological Method for Measuring and Processing Field-Scale Energy Flux Density Data
09:55

Surface Renewal: An Advanced Micrometeorological Method for Measuring and Processing Field-Scale Energy Flux Density Data

Published on: December 12, 2013

8.6K
Leaf Area Index Estimation Using Three Distinct Methods in Pure Deciduous Stands
00:09

Leaf Area Index Estimation Using Three Distinct Methods in Pure Deciduous Stands

Published on: August 29, 2019

13.4K
Surface Mapping of Earth-like Exoplanets using Single Point Light Curves
06:48

Surface Mapping of Earth-like Exoplanets using Single Point Light Curves

Published on: May 10, 2020

3.4K

Area of Science:

  • Environmental Science
  • Human Physiology
  • Chronobiology

Background:

  • Terrestrial light changes spectrally, spatially, and temporally due to diurnal cycles and atmospheric conditions.
  • Light exposure acts as a crucial "zeitgeber" (time giver), influencing human physiology and behavior by regulating biological rhythms.

Purpose of the Study:

  • To analyze spectral light-field data outdoors from dawn to dusk under varying weather conditions.
  • To investigate the physiological implications of light variations on circadian regulation via photoreceptors.
  • To compare spectral differences between diffuse and directional light components and assess haze effects.

Main Methods:

  • Collected spectral light-field data over four days in Delft (sunny and cloudy) and Newcastle (overcast).
  • Decomposed light fields into diffuse and directional components to analyze spectral composition.
  • Examined variations in α-opic illumination vectors and their alignment with photoreceptor sensitivities.

Main Results:

  • Overcast conditions showed reduced light variability due to increased scattering, altering spectral composition.
  • α-opic illumination vectors varied with weather, aligning with photoreceptor sensitivities under clear and cloudy skies.
  • Haze shifted chromaticity towards blue, potentially increasing melanopic efficiency, but dawn/dusk light variations are more significant for circadian regulation.

Conclusions:

  • Weather significantly impacts terrestrial light's spectral and directional properties, influencing photoreceptor responses.
  • While daily light fluctuations are substantial, dawn and dusk light transitions are the primary drivers of circadian rhythm regulation.
  • Understanding light variability is crucial for comprehending its role in human biological timing.