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Did you mean basic rest–activity cycle basic rest–activity cycle
basic rest–activity cycle n. Quick reference
A Dictionary of Psychology (4 ed.)
... rest–activity cycle n. 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–activity cycle . BRAC ...
basic rest-activity cycle
46 The History of the Book in Latin America (including Incas, Aztecs, and the Caribbean) Reference library
The Oxford Companion to the Book
...ended up affecting the book industry or the business of bookselling: for example, a protectionist national policy toward papermaking in Mexico resulted in higher production costs for books. In addition, the fall in oil prices, precipitating a financial crisis that led to cycles of hyperinflation, devaluation, and economic recession in most of the region during the 1980s actually reduced the population’s income, increased book production costs, and led to declining book sales. From 1984 to 1990 , for example, Argentina produced 18 per cent fewer...
biological rhythm
chronobiology
infradian rhythm
chronobiology n. Quick reference
A Dictionary of Psychology (4 ed.)
... n. 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 rhythm , delta wave , gamma wave , infradian rhythm , menstrual cycle , sensorimotor rhythm , sleep–wake cycle , suprachiasmatic nucleus , telomere , theta wave , ultradian rhythm , Zeitgeber . [From Greek chronos time + English biology...
biological rhythm n. Quick reference
A Dictionary of Psychology (4 ed.)
...rhythm n. Any periodic, more-or-less regular fluctuation or cycle in a biological system or process that is not wholly under the control of environmental cues but is controlled centrally by a biological clock . It may be an ultradian rhythm such as a circannual rhythm or a menstrual cycle ; a circadian rhythm such as the sleep–wake cycle ; or an infradian rhythm such as an alpha wave , basic rest–activity cycle , beta wave , delta wave , gamma wave , sensorimotor rhythm , or theta wave . See also chronobiology , pacemaker...
infradian rhythm n. Quick reference
A Dictionary of Psychology (4 ed.)
...rhythm n . 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 clock , chronobiology , Zeitgeber . Compare circadian rhythm , circannual rhythm , ultradian rhythm . [From Latin infra under + dies a...
sleep n. Quick reference
A Dictionary of Psychology (4 ed.)
...III, and IV NREM sleep respectively. See also basal forebrain , basic rest–activity cycle , circadian rhythm , delta sleep-inducing peptide , delta wave , dream ( 1 ) , dyssomnias , hypnagogic image , hypnopompic image , K complex , locus coeruleus , magnocellular nucleus , melatonin , nucleus gigantocellularis , paradoxical sleep , parasomnias , PGO spike , pineal gland , polysomnography , pseudoinsomnia , REM atonia , REM rebound , sleep spindle , sleep–wake cycle , sleepwalking , slow-wave sleep , subcoerulear nucleus...
cyclicity Reference library
The Oxford Companion to the Earth
...and ‘greenhouse’ states. Second-order cycles may be driven by cycles of fast and slow mantle convection which regulate sea-floor spreading on a scale of 30 to 60 million years. Periods of Phanerozoic fast spreading are correlated with those of high magnetic field activity, which is also related to the vigour of mantle convection. When mantle activity is reduced, spreading is slower and there is a drop in sea level; magnetic polarity can be frequently reversed. There is much argument about the reality of these cycles, seemingly because they reveal an overall...
electrocardiogram Reference library
The Oxford Companion to the Body
...‘peaks’ are labelled as P, QRS, and T (see figure). The most basic feature of the ECG is that the time from any one such ‘peak’ to the same one in the next cycle indicates precisely how long the heart cycle is taking. At slow rates, the timing of the waves can be easily correlated to the heart sounds heard with the stethoscope. But far more precise information can be gleaned once the relationship of the waves to the phases of the cycle is understood: The P-wave indicates the electrical activity associated with contraction of the cardiac atria, the heart's...
Mbuti Dance Reference library
The International Encyclopedia of Dance
...as in the reproductive cycle, which is echoed in dance movements. As if to regenerate the cycle interrupted by the death, the molimo dance emphasizes the separate but equally necessary roles of male and female in creating life. The men build a sacred fire as they dance and then, with a movement imitating the act of copulation, fan it into a blaze. The women slowly and deliberately dance through the fire, scattering the burning logs, which the men once again build into a blaze. At any moment, the women can stop the activity of the men— “killing the hunt...
mélodie Reference library
Leslie Orrey and Roger Nichols
The Oxford Companion to Music
...to Gounod's basic model. Fauré's early songs remain close to the romance , but in such a mélodie as Automne ( 1878 ) the regular rhythms are already threatening rather than consoling. His 17 settings of Paul Verlaine , made between 1887 and 1894 , wonderfully mirror the poet's elegant, melancholy languor and, in the cycle La Bonne Chanson ( 1892–4 ), his ability to break out into joy. Such later cycles as La Chanson d'Ève ( 1906–10 ) and Le Jardin clos ( 1914 ) show Fauré's harmony at its most elusive, but in two final cycles, Mirages (...
Festivals and Festival Cycles Reference library
The Oxford Encyclopedia of Mesoamerican Cultures
...more complex; it was dialectical, and its symbolism was exuberant. Besides the solar reference, the structure of the festival calendar derived from seasonal and agricultural cycles. The division of the year into the dry season ( tonalco ) and the rainy season ( xopan ) was fundamental. Ceremonies dedicated to the deities of rain, maize, and the earth provided the basic calendrical cycle. Mesoamerica is situated within the tropical latitudes, where the sun passes the zenith twice a year, on its apparent journey toward the Tropic of Cancer (23°27′N), and on its...
arousal vs awareness Reference library
The Oxford Companion to Consciousness
...network is also known to be the most active ‘by default’ in resting non‐stimulated conditions ( see conscious resting state ). Awareness seems not exclusively related to the activity in the frontoparietal network but, as importantly, to the functional connectivity within this network and with the thalami. Long‐range cortico‐cortical and corticothalamo‐cortical ‘functional disconnections’ have been identified in the vegetative state and recovery is paralleled by a functional restoration of the frontoparietal network and part of its cortico‐thalamocortical...
breathing Reference library
The Oxford Companion to the Body
...change. At the end of inspiration such activity ceases fairly rapidly, allowing the lungs to deflate due to elastic recoil back to their starting lung volume at FRC. The cycle then repeats. It is generally held that during breathing at rest expiration is a mainly ‘passive’ process, although some activity in expiratory muscles may maintain the outflow of air. The inspiratory augmentation in the EMG is due to the progressive recruitment in the number and discharge frequencies (e.g. ranging from 5–25 Hz) of the active motor units in the respective muscles....
Sabbath Reference library
Troy W. Martin
The Oxford Encyclopedia of the Bible and Ethics
...calendar as a precedent for the sabbath is also not persuasive. This calendar’s basic unit was a week of 7 days, and its secondary unit was a period of 50 days or seven of these weeks plus one additional day as a day of celebration or termination. Seven of these 50-day periods (350 days) plus 2 festival weeks (14 days) and 1 supremely sacred day (1 day) comprise a 365-day year (Morgenstern, p. 136). This calendar is called “pentecontad” because of its 50-day cycles, but lack of evidence for this calendar makes this proposal “the least likely to be...
Ritualizing and Anthropology Reference library
The Encyclopedia of Religion and Nature
... identified two principal types of rituals, both tied to natural cycles: rites of passage and rites of intensification . Rites of passage involve transformations in the life cycle of an individual. They typically occur around times of personal transition, such as birth, puberty, marriage and death. Initiation rites for shamans, healers, priests and priestesses are also considered rites of passage. In some religions, rites of passage involve the temporary isolation of initiates from the rest of society. Among the Plains Indians in North America, for example,...
Economy, American, since World War II Reference library
Grahame Thompson
The Oxford Companion to Comparative Politics
... is given some analytical purchase by being organized —in the first instance at least—around the cyclical nature of economic activity. Capitalist economies—of which the US is exemplary—tend to move in cycles of what is popularly known as “boom and bust.” In a more academic parlance this is termed the “business cycle,” and it has tended to take a six to ten-year period to move through the stages of first an expansion of economic activity, followed by contraction. Because the US economy has been of such importance to the health of the international economy (or...
