Environmental Light Dark
Environmental Light Dark - Related Videos
04:45
Light-Dark Preference Test: A Method to Study Anxiety-Related Behavior in Zebrafish
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2023
The video describes the light-dark preference assay to study the anxiety-related behavior in zebrafish following the exposure to ethanol.
10:35
Light/dark Transition Test for Mice
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Cited by 258 •
2006
The light/dark transition test is one of the most widely used tests to measure anxiety-like behavior in mice. Here, we present a movie that shows detailed procedures on how we conduct the test.
03:17
Cyanobacterial Culture Synchronization and DNA Compaction Driven by Light-Dark Cycles
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2025
Source: Murata, K. et. al., Visualization of DNA Compaction in Cyanobacteria by High-voltage Cryo-electron Tomography. J. Vis. Exp. (2018)This video demonstrates the synchronous cultivation of cyanobacteria under light-dark cycles to study circadian-regulated DNA compaction. Fluorescence microscopy reveals condensed DNA at defined time points, confirming cell cycle alignment across the population.
10:30
Recording Light-evoked Postsynaptic Responses in Neurons in Dark-adapted, Mouse Retinal Slice Preparations Using Patch Clamp Techniques
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Cited by 3 •
2015
We will demonstrate how to prepare retinal slices from the mouse eye and record light responses in retinal neurons. The entire procedure is conducted in dark-adapted conditions.
01:29
Dark Triad and Person Perception
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2025
Person perception is influenced by both external behaviors and the observer’s internal characteristics, including personality traits. Individuals with dark personality traits, comprising psychopathy, Machiavellianism, and narcissism — collectively known as the dark triad – exhibit manipulative and exploitative tendencies in social contexts. These traits affect how they perceive others and how they are perceived.The Role of Dark Personality Traits in Person PerceptionBlack et al. (2014) explored...
FAQs
Specialized retinal photoreceptors detect changes in illumination and transmit timing information to the suprachiasmatic nucleus, the central circadian pacemaker. This signal allows the brain to align daily patterns of sleep, activity, hormone release, and other physiological functions with the surrounding light-dark schedule. Studying this pathway helps researchers link sensory input with coordinated neural and bodily rhythms.
These variables change the timing cues received by the circadian system and allow researchers to examine different responses to illumination and darkness. Varying when light occurs, how long it lasts, or how intense it is can reveal how biological clocks, neural pathways, and behavior respond to altered environmental signals. The resulting comparisons help identify which lighting features influence daily organization.
Altered lighting provides a controlled way to test whether changes in environmental timing correspond with changes in sleep, activity, hormone release, or other physiological functions. Because researchers can adjust specific features of the light-dark schedule, they can examine behavioral responses alongside neural pathways and biological clocks. This connects observable behavior with the brain systems that coordinate daily rhythms.
Researchers establish a recurring illumination and darkness schedule, then modify its timing, duration, or intensity according to the experimental question. They examine resulting changes in biological clocks, neural pathways, behavior, sleep, activity, hormone release, or other physiological functions. Comparing responses across lighting conditions makes it possible to evaluate how strongly the circadian system depends on particular environmental timing cues.
These cycles are useful when researchers need to examine how changes in environmental lighting affect daily regulation or adaptation. Experiments can address sleep disruption by altering the usual lighting pattern, while seasonal adaptation studies can use differing illumination conditions to investigate responses associated with changing environmental schedules. Both applications connect external light cues with brain and body function.
Controlled light-dark environments give researchers a consistent way to examine laboratory animal behavior in relation to biological timing. By changing illumination conditions and observing activity or other physiological responses, investigators can study how environmental cues influence behavior and circadian regulation. The approach also helps relate animal findings to broader questions about neural pathways, sleep disruption, and altered lighting environments.