Free Running Rhythms
Free Running Rhythms - Related Videos
05:46
Recording and Analysis of Circadian Rhythms in Running-wheel Activity in Rodents
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Cited by 35 •
2013
Circadian rhythms in voluntary wheel-running activity in mammals are tightly coupled to the molecular oscillations of a master clock in the brain. As such, these daily rhythms in behavior can be used to study the influence of genetic, pharmacological, and environmental factors on the functioning of this circadian clock.
11:50
EEG Mu Rhythm in Typical and Atypical Development
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Cited by 3 •
2014
Assessment of the EEG mu rhythm provides a unique methodology for examining brain activity and when combined with behaviorally based assays, can be a powerful tool for elucidating aspects of social cognition, such as imitation, in clinical populations.
18:08
Assaying Locomotor Activity to Study Circadian Rhythms and Sleep Parameters in Drosophila
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Cited by 165 •
2010
We describe procedures for recording daily locomotor activity rhythms of Drosophila and subsequent data analysis. Locomotor activity rhythms are a reliable behavioral output of animal circadian clocks and are used as the standard readout of clock function when studying circadian mutants or examining how the environment regulates the circadian system.
09:09
Design and Analysis of Temperature Preference Behavior and its Circadian Rhythm in Drosophila
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Cited by 26 •
2014
We recently identified a novel Drosophila circadian output, temperature preference rhythm (TPR), in which the preferred temperature in flies rises during the day and falls during the night. TPR is regulated independently from another circadian output, locomotor activity. Here we describe the design and analysis of TPR in Drosophila.
01:17
Wald-Wolfowitz Runs Test II
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2025
The Wald-Wolfowitz runs test, commonly referred to as the runs test, is a nonparametric test used to assess the randomness of ordered data. The test evaluates the number of runs, which are consecutive sequences of similar elements within the data. If the number of runs is significantly higher or lower than expected, the data is considered non-random, indicating a detectable pattern or structure. For binary data, runs are identified using symbols such as + and −, or equivalently, 1s and 0s. In...
FAQs
At the molecular level, the suprachiasmatic nucleus (SCN) coordinates circadian timing through molecular transcriptional-translational feedback loops. These loops help sustain rhythmic clock activity within the organism, while environmental timing signals normally provide synchronization. Examining this mechanism connects cellular clock operation with measurable cycles in behavior and physiology.
When external synchronizers are absent, internal timing no longer stays aligned with local time. The observed rhythm therefore shifts progressively relative to the 24-hour day, exposing the clock’s intrinsic period. This drift distinguishes internally generated timing from responses imposed by an environmental schedule and helps investigators characterize how consistently the clock operates under uncued conditions.
Investigators can examine sleep-wake patterns, activity, hormone rhythms, or body-temperature rhythms to assess circadian regulation. These measurements provide complementary views of how timing influences behavior and physiology rather than limiting analysis to a single outcome. Their rhythmic patterns can help characterize clock function and identify differences between individuals or conditions.
A typical approach removes external time cues, such as light-dark cycles, and then follows a biological rhythm over time. Researchers may monitor sleep-wake behavior, activity, hormone levels, or temperature while the internal cycle continues. The resulting timing pattern and its relationship to local time provide evidence about endogenous clock behavior.
Tracking the timing of internally generated cycles under uncued conditions can reveal individual differences in clock organization. Measurements of sleep-wake, activity, hormone, or temperature rhythms may show how a person’s biological timing relates to the external day. This information supports characterization of chronotypes, referring to differences in preferred or characteristic timing.
Their measurement exposes how internal timing behaves when environmental synchronization is absent, making it useful for studying disrupted circadian organization. The approach provides context for conditions associated with mistimed rhythms, including jet lag, shift work, sleep disorders, and neurological disease. It can therefore connect altered timing patterns with broader changes in behavior and physiology.