latency

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Related to Sleep latency: MSLT

latency

[′lat·ən·sē]
(computer science)
The waiting time between the order to read/write some information from/to a specified place and the beginning of the data-read/write operation.
(medicine)
The stage of an infectious disease, other than the incubation period, in which there are neither clinical signs nor symptoms.
(physiology)
The period between the introduction of and the response to a stimulus.
(psychology)
The phase between the Oedipal period and adolescence, characterized by an apparent cessation of psychosexual development.

latency

(communications)
1. The time it takes for a packet to cross a network connection, from sender to receiver.

2. The period of time that a frame is held by a network device before it is forwarded.

Two of the most important parameters of a communications channel are its latency, which should be low, and its bandwidth, which should be high. Latency is particularly important for a synchronous protocol where each packet must be acknowledged before the next can be transmitted.

latency

(1) Essentially any delay or lapse in time. In general, it is the time between initiating a request in the computer and receiving the answer. Data latency may refer to the time between a query and the results arriving at the screen or the time between initiating a transaction that modifies one or more databases and its completion.

Disk latency is the time it takes for the selected sector to be positioned under the read/write head. Channel latency is the time it takes for a computer channel to become unoccupied in order to transfer data. Network latency is the delay introduced when a packet is momentarily stored, analyzed and then forwarded.

(2) With malicious software, latency is the period between infection and the first obvious damage to the host system. Many viruses or logic bombs written by amateurs have a short latency and are therefore relatively easy to detect; however, more vicious malware can lie dormant or replicate to many other hosts and then wreak havoc unexpectedly. See logic bomb and virus.
References in periodicals archive ?
Actigraphy was used for a 1-week period to measure sleep latency, total sleep time, sleep efficiency, and number and length of awakenings for both groups.
In this regard, Mitler, et al, concluded that two or more sleep onset REM periods in the Multiple Sleep Latency Test results could be a crucial factor in establishing a narcolepsy diagnosis.
Therefore, emotion control training can somewhat reduce the sleep latency.
84 [+ or -] 2 %), whereas sleep latency and percentage moving time values increased (sleep latency = 19 [+ or -] 12 vs.
Sleepiness is assessed objectively via the Multiple Sleep Latency Test, which is performed in a sleep center often on the morning and afternoon following overnight polysomnography.
On the fourth day objective sleepiness was assessed with the Multiple Sleep Latency Test (MSLT), and meals were provided five times to assess diet.
5), (6) In fibromyalgia, there is evidence of prolonged sleep latency (time it takes to fall asleep), low sleep efficiency (total time spent asleep while in bed), and an increased amount of stage 1 NREM sleep.
In a Phase II/III study (Study 126) conducted in Japan in patients with primary insomnia, patients treated with Lunesta demonstrated a statistically significantly improvement in Sleep Latency (SL)1), as measured by subjective evaluation, compared to placebo.
Daily sleep and daytime activity variables, sleep latency (time from lights off to sleep onset), percentage of wakefulness after sleep onset (WASO), movement fragmentation index (MFI) (number of wake bouts between sleep onset and sleep offset expressed per hour) and total activity scores (TAS) were determined.
The investigators examined the bidirectional links between nightly sleep and daily marital interactions among 35 healthy married couples (mean age, 32 years) by correlating the actigraph results for sleep latency, wakefulness after sleep onset, and total sleep time of each partner over 10 nights, with daily self-reported positive and negative marital interactions assessed via electronic diaries during the same period.