
A term particularly used in the contexts of factorial experiments and log-linear models to describe cases where the combined effects of two variables is not a simple sum of their separate effects. For example, we might write
Also known as spatial interaction, this is the action between two points, upon one another. An interaction model describes the reactions of two or more processes or systems as they affect each other.
1. The combined effect of two or more independent variables acting simultaneously on a dependent variable. Analysis of variance is used to assess the effect of the interaction between the variables as well as the specific effect of each.
2. The interplay that occurs between two or more persons or groups. Sport psychologists are interested in how members of teams interact and how that interaction can be made more productive. In some sports, such as basketball, the need for interaction is high and requires a lot of cooperation, while in other sports, such as athletic field events, interaction is not important.
| inter+, intensive property, intensity millicurie | |
| interaction broadening, interactive, interallelic complementation |
1. the quality, state or process of (two or more things) acting on each other.
2. in statistical terms, the response to one factor at any particular level, which differs according to the level of the other factor.
3. see effect modifier.
According to Newton’s law of interaction, the phenomenon in which every force is accompanied by an equal and opposite force. For every force there are two bodies— one to exert the force and one to receive it. Furthermore, whenever there is one force, another force must also be involved. If there is force to the right on one body, there is force to the left on another. Since the one force acts as long as the other, the impulses are equal. The total momentum of the two interacting bodies cannot change. Continuous interaction is demonstrated between the food that is masticated and the force applied to the food.

Interaction is a kind of action that occurs as two or more objects have an effect upon one another. The idea of a two-way effect is essential in the concept of interaction, as opposed to a one-way causal effect. A closely related term is interconnectivity, which deals with the interactions of interactions within systems: combinations of many simple interactions can lead to surprising emergent phenomena. Interaction has different tailored meanings in various sciences.
Casual examples of interaction outside of science include:
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Geneticists work with a number of different genetic interaction modes to characterize how the combination of two mutations affect (or does not affect) the phenotype:[1] noninteractive, synthetic, asynthetic, suppressive, epistatic, conditional, additive, single-nonmonotonic and double-nonmonotonic. Further characterizations is enhancement interaction and nonadditive interaction. Biosemioticists investigate sign-mediated interactions within and between organisms that underlie syntactic, pragmatic and semantic rules.
The word epistasis is also used for genetic interaction in some contexts.
Interactions between atoms and molecules:
Interactions between electrons:
In molecular biology, the knowledge on gene/protein interaction among themselves and with their metabolites is referred to as molecular pathways.
In medicine, most medications can be safely used with other medicines, but particular combinations of medicines need to be monitored for interactions, often by the pharmacist. Interactions between medications (drug interactions) fall generally into one of two main categories:
In terms of efficacy, there can be three types of interactions between medications: additive, synergistic, and antagonistic. Additive interaction means the effect of two chemicals is equal to the sum of the effect of the two chemicals taken separately. This is usually due to the two chemicals acting on the body in the same way. Examples would be Aspirin and Motrin, Alcohol and Depressant, Tranquilizer and Painkiller. Synergistic interaction means that the effect of two chemicals taken together is greater than the sum of their separate effect at the same doses. An example is Pesticide and Fertilizer, the biological effect is devastating. Antagonistic interaction means that the effect of two chemicals is actually less than the sum of the effect of the two drugs taken independently of each other. This is because the second chemical increases the excretion of the first, or even directly blocks its toxic actions. Antagonism forms the basis for antidotes of poisonings.
In media, interactivity is a feature of the media in question and as digital technology becomes more accessible to the masses interest in interactivity is increasing and becoming a cultural trend especially in the arts.
In physics, a fundamental interaction or fundamental force is a process by which elementary particles interact with each other. An interaction is often described as a physical field, and is mediated by the exchange of gauge bosons between particles. For example, the interaction of charged particles takes place through the mediation of electromagnetic fields, whereas beta decay occurs by means of the weak interaction. An interaction is fundamental when it cannot be described in terms of other interactions. There are four known fundamental interactions in Nature: The electromagnetic, strong, weak, and gravitational interactions. The weak and electromagnetic interactions are unified in electroweak theory, which is unified with the strong force in the Standard Model.
In sociology, social interaction is a dynamic, changing sequence of social actions between individuals (or groups) who modify their actions and reactions due to the actions by their interaction partner(s). Social interactions can be differentiated into accidental, repeated, regular, and regulated. Social interactions form the basis of social relations.
In statistics, an interaction is a term in a statistical model in which the effect of two, or more, variables is not simply additive.
If we were examining the effect of two variables, gender and premature birth, on health outcomes, we would describe any difference in health outcome scores between genders as a main effect. Similarly any difference in scores of full term/premature birth would be described as a main effect. The presence of an interaction effect implies that the effect of gender on health outcome varies as a function of premature birth status.
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Dansk (Danish)
n. - vekselvirkning, gensidig påvirkning, samspil, interaktion
Nederlands (Dutch)
interactie, wisselwerking
Français (French)
n. - (Phys, Comput) interaction
Deutsch (German)
n. - Wechselwirkung, Interaktion
Ελληνική (Greek)
n. - αλληλεπίδραση
Italiano (Italian)
interazione
Português (Portuguese)
n. - interação (f)
Русский (Russian)
взаимодействие
Español (Spanish)
n. - interacción, acción recíproca
Svenska (Swedish)
n. - ömsesidig påverkan, samspel, interaktion
中文(简体)(Chinese (Simplified))
交互作用, 交感
中文(繁體)(Chinese (Traditional))
n. - 交互作用, 交感
العربيه (Arabic)
(الاسم) تفاعل
עברית (Hebrew)
n. - פעולת גומלין, פעולה הדדית, הידוד
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