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In Drosophila there are two distinct groups of circadian clocks: the clock neurons and the clock genes. They act concertedly to produce the 24-hour cycle of rest and activity. Light is the source of activation of the clocks. The compound eyes, ocelli, and Hofbauer-Buchner eyelets (HB eyelets) are the direct external photoreceptor organs.
The first published usage of the term "phase response curve" was in 1960 by Patricia DeCoursey. The "daily" activity rhythms of her flying squirrels, kept in constant darkness, responded to pulses of light exposure. The response varied according to the time of day – that is, the animals' subjective "day" – when light was administered.
A circadian clock, or circadian oscillator, also known as one’s internal alarm clock is a biochemical oscillator that cycles with a stable phase and is synchronized with solar time. Such a clock's in vivo period is necessarily almost exactly 24 hours (the earth's current solar day). In most living organisms, internally synchronized circadian ...
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Although many researchers consider light to be the strongest cue for entrainment, it is not the only factor acting on circadian rhythms. Other factors may enhance or decrease the effectiveness of entrainment. For instance, exercise and other physical activity, when coupled with light exposure, results in a somewhat stronger entrainment response ...
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Baby Einstein, stylized as baby einstein, is an American franchise and line of multimedia products, including home video programs, CDs, books, flash cards, toys, and baby gear that specialize in interactive activities for infants and toddlers under three years old, created by Julie Aigner-Clark. The franchise is produced by The Baby Einstein ...
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