reaction time


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reaction

 [re-ak´shun]
1. opposite action or counteraction; the response of a part to stimulation.
2. the phenomena caused by the action of chemical agents; a chemical process in which one substance is transformed into another substance or substances.
3. in psychology, the mental or emotional state that develops in any particular situation.
4. the specific cellular effect produced by foreign matter, as in testing for allergies. For specific reactions, see under the name, such as pirquet's reaction.
reaction of degeneration the reaction to electrical stimulation of muscles whose nerves have degenerated, consisting of loss of response to a faradic stimulation in a muscle, and to galvanic and faradic stimulation in the nerve.
reaction time the time elapsing between the application of a stimulus and the resulting reaction.

re·ac·tion time

the interval between the presentation of a stimulus and the responsive reaction to it.

reaction time

n.
The interval of time between application of a stimulus and detection of a response.

reaction time

Etymology: L, re, again, agere, to act; AS, tima
the interval between the application of a stimulus and the beginning of a response.

re·ac·tion time

(rē-ak'shŭn tīm)
Interval between presentation of a stimulus and the beginning of an individual's response.

reaction time

The interval between the application of a stimulus and the first sign of a response.

reaction time

see LATENT PERIOD (1).

reaction time

the time that elapses between the presentation of a stimulus and a response; also known as response latency. choice reaction time reaction time when two or more stimuli are presented and different responses are required, also known as complex reaction time. discrimination reaction time reaction time where a response is required to only one of two or more stimuli. simple reaction time reaction time when only one stimulus is presented and one response is required.

reaction time

interval between a stimulus and the evoked response

reaction time 

The time interval between the onset of a stimulus and the response of a subject. Visual stimulations with a flash of light give rise to reaction times varying between 130 and 180 ms. This figure diminishes significantly with age.

re·ac·tion time

(rē-ak'shŭn tīm)
Interval between presentation of a stimulus and responsive reaction to it.

reaction

1. opposite action or counteraction; the response of a part to stimulation.
2. the phenomena caused by the action of chemical agents; a chemical process in which one substance is transformed into another substance or substances.

chain reaction
one which is self-propagating; a chemical process in which each time a free radical is destroyed a new one is formed.
coupled reaction
one in which the free energy released by one chemical reaction drives the other reaction.
dark reaction
photosynthetic reaction which fixes CO2 into sugar and which occurs without exposure to light. Called also Calvin cycle.
reaction of degeneration
the reaction to electrical stimulation of muscles whose nerves have degenerated, consisting of loss of response to a faradic stimulation in a muscle, and to galvanic and faradic stimulation in the nerve.
delayed reaction
a reaction, such as an allergic reaction, occurring hours to days after exposure to an inducer.
false negative reaction
an erroneously negative reaction to a test.
false positive reaction
an erroneously positive reaction to a test.
first set reaction
immune reaction
1. immune response; see also immunity.
2. formation of a papule and areola without development of a vesicle following smallpox vaccination.
lengthening reaction
reflex elongation of extensor muscles that permits flexion of a limb.
leukemic reaction, leukemoid reaction
a peripheral blood picture resembling leukemia or indistinguishable from it on the basis of morphological appearance alone, characterized by immature leukocytes in the blood.
reaction pattern analysis
designed to replace archaic, non-specific descriptions of the reactions of the skin to noxious influences; recommended categories are (1) perivascular dermatitis, (2) interface dermatitis, (3) vasculitis, (4) nodular and diffuse dermatitis, (5) intradermal vesicular and pustular dermatitis, (6) subepidermal vesicular and pustular dermatitis, (7) perifolliculitis, folliculitis and furunculosis, (8) fibrosing dermatitis, (9) panniculitis, (10) atrophic dermatosis, (11) mixed reaction patterns.
second set reaction
reaction specificity
lack of production of by-products in enzymatic reactions with yields of products being nearly 100%.
Strauss reaction
development of suppurative peritonitis, localized to the scrotal sac, in the guinea pig after the intraperitoneal injection of material containing Burkholderia mallei.
stress reaction
1. alarm reaction.
2. gross stress reaction.
reaction time
the time elapsing between the application of a stimulus and the resulting reaction.
wheal-flare reaction
a cutaneous sensitivity rection to skin injury or administration of antigen, due to histamine production and marked by edematous elevation and erythematous flare.
References in periodicals archive ?
Moreover, even if textual warnings were evaluated equally high in declarations as pictorial warnings, on emotional level warnings containing pictures are still more convincing therefore attitudes toward them are more certain, as revealed by neuro Reaction Time measure.
This reaction time was presented as 2 stimuli (tactile as well as visual) and three stimuli tactile + auditory + visual).
Researchers from UCL and the University of Edinburgh have found that people with slower reaction times were 25% more likely to die compared to those with average reaction times.
During both tests, alertness and reaction times were measured.
We hypothesize that the dual-task condition of text mess aging during driving simulation will produce cognitive demands significant enough to decrease mental output capacity, measurable through increases in reaction time, and that it will produce related cardiovascular and respiratory changes to further support the notion of text messaging increasing cognitive stress during dual-task situations.
Their jumping power remained strong, but shooting accuracy and visual reaction time showed tendency to be impaired, according to the study.
Repeat steps 2 through 8 to calculate your partner's reaction time.
The aim of this study was to analyze the effects of DHA supplementation on perceptual-motor processes, such as complex reaction time, accuracy, and efficiency in elite female soccer players.
Their average reaction time increased from 193 milliseconds at the start of the season to 222 milliseconds after their injuries, a statistically significant difference.
According to Deary & Der (2005) reaction time variables have been used frequently in studies of human cognitive aging, and research in the information processing paradigm of psychometrics intelligence.