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biological rhythm

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basic rest-activity cycle

Overview page. Subjects: Psychology.

A biological rhythm of waxing and waning alertness with a period of approximately 90 minutes in humans. During sleep it controls the cycles of REM and slow-wave sleep. Also called the rest-...

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biological clock

Overview page. Subjects: Biological Sciences.

1. any mechanism that allows expression of specific genes at periodic intervals. 2. any physiological factor that regulates body rhythms. See clock mutants.

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biorhythm

Overview page. Subjects: Science and Mathematics — Sports and Exercise Medicine.

A roughly periodic change in the behaviour or physiology of an organism that is generated and maintained by a biological clock. Well-known examples are the annual and circadian rhythms...

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chronobiology

Overview page. Subjects: Psychology — Medicine and Health.

The branch of biology concerned with biological rhythms. See biological clock, biological rhythm. See also alpha wave, basic rest-activity cycle, beta wave, circadian rhythm, circannual...

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circadian rhythm

Overview page. Subjects: Biological Sciences — Medicine and Health.

Any 24-hour periodicity in the behaviour or physiology of animals or plants. Examples are the sleep/activity cycle in many animals and the growth movements of plants. Circadian rhythms are...

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circannual rhythm

Overview page. Subjects: Psychology.

Any biological rhythm involving a biological or psychological process that occurs or fluctuates at intervals of approximately one year, even in controlled environments from which seasonal...

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circaseptan rhythm

Overview page. Subjects: Psychology.

Any biological rhythm with a period of approximately seven days. [From Latin circa about + septem seven]

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hangover

Overview page. Subjects: Medicine and Health.

Headache and feeling of malaise resulting from excessive consumption of alcoholic beverages. The severity differs with different beverages, and is due to both the toxic effects of alcohol...

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infradian rhythm

Overview page. Subjects: Psychology.

Any biological rhythm with a period of less than a day. See alpha wave, basic rest-activity cycle, beta wave, delta wave, gamma wave, sensorimotor rhythm, theta wave. See also biological...

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pacemaker neuron

Overview page. Subjects: Psychology.

Any of a number of different nerve cells in the autonomic nervous system that trigger regular cyclic activities, such as heartbeat, breathing, and EEG waves. The suprachiasmatic nucleus is...

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