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 ?
In this trial, there was a significant increase in both visual and auditory reaction times in the tizanidine group whereas no increase in the eperisone group.
The present study was developed to determine the effect of vibration on seated occupant reaction time and drowsiness level.
The participants were then explained the process of simple reaction time in the Physiology Laboratory.
Longer reaction time and higher BMI in females could be attributed to fluid and salt retention due to female sex hormones affecting sensorimotor coordination.
The attractive features of this procedure were the facile and mild reaction conditions, high yields, short reaction times and reusability of the catalyst.
The diagnoses of reaction time of referees who work in different classifications were given on Table-1.
A multiple comparison test is performed for each lighting pattern and position regarding the reaction time.
The incongruent arrows cause a slower reaction time due to the stimulation of an inaccurate answer before the task is finished (Hillman et al.
The findings indicate that supplementing Cognitive Psychological Training in combination with Explosive Power Training used in this study significantly enhances responsiveness in the Response Time of club level badminton players and reduces both Reaction Time and Movement Time.
In this study, simple and choice reaction time were tested to compare reaction times of karate athletes according to the age categories, status (competing on national or international level) and gender.
A Peripheral Detection Task (PDT), a simulation test where the driver is asked to respond to objects in the periphery of their visual field while completing a distracting task, was utilized to compare mental capacity during visual distraction while driving, using reaction time (RT) as a measure of the magnitude of distraction (Olsson & Burns 2000).
The company's ANSR for Listeria is the second test available for its revolutionary ANSR pathogen detection system, providing results after only 20 minutes of reaction time when compared to other commercially available molecular amplification tests of up to three hours of reaction time.