Latency Period

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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Latency Period


(1) In physiology, the time from the moment of stimulation of an organism, organ, tissue, or cell until the manifestation of a responsive reaction.

The duration of the latency period depends on the level of phylogenetic development, individual development, and functional state of the body and on the complexity of the reaction and the speed of the processes in its peripheral and central links. Thus, the latency period of a given reflex consists of the time it takes to transform the energy of the external stimulus in the receptor, the time necessary to conduct the excitation along the nerve fibers, the duration of the synaptic lags, and the time required to trigger the effectors.

The latency period of psychological reactions characterizes the level of wakefulness and the states of attentiveness and tension. Determination of the magnitude of the latency period is of great importance in physiology, medicine (for studying the functions of the healthy and the diseased body), and experimental psychology.

(2) The latency period of pregnancy is a temporary lag in the development of the fertilized ovum in certain mammals; during the late blastula stage, the embryo lives in the womb for several months without attaching to the uterine mucosa. Fertilization of the sable, marten, ermine, badger, and roe deer occurs during the summer-fall period, but accelerated development of the ovum does not begin until the end of winter; hence, gestation in those animals goes on for nine months or more.

(3) In medicine, incubation period; the initial, latent period of a disease, without external manifestation.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
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"It may be that the bladder cancer cases are not related to work environments but, in Germany, a worker might be compensated for bladder cancer after only a one-year latency period, so the 10-year figures used by NHS Lanarkshire could be contested."
The Massachusetts Supreme Judicial Court has ruled that a statute of repose barring many construction-related personal injury claims after a time limit of six years also applies to claims involving diseases with extended latency periods, such as asbestos-related illnesses.
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However, the latency period is now known to be at least 30 years and because of the known potential for even longer latency periods for prion diseases, this outbreak is likely to continue.
The prolonged latency period (59 years) found in the current study is consistent with other studies [16,27].
Latency period of brooders in treatment 3 (40% CP) was 47.70+-0.54 h where ovaprim+HCG was injected while it was 49.25+-0.12 h in treatment 2 (35% CP) which received ovaprim + fresh pituitary hormones.
The Length of Latency Period. The latency period refers to the intermission from the placement of device to the distraction.
(4) There is one documented case report of Rabies Encephalitis after 25 years of latency period. (3)
The median age at diagnosis of SSPE was 12 years, although the range was 3-35 years, and the mean latency period was 9.5 years.
The average latency period between a positive paper-based CRD test and delivery was 14 days, which was significantly shorter than the interval for those who tested negative, Dr.
After a latency period of 5 days, in groups I and III the left mandibles were lengthened 0.5mm every 12 hours for 10days.