Interaction

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. Closely related terms are interactivity and interconnectivity, of which the latter 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. Changes can also involve interaction.

For other uses, see Interaction (disambiguation).
Communication
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Two people talking

Casual examples of interaction outside science include:

  • Communication of any sort, for example two or more people talking to each other, or communication among groups, organizations, nations or states: trade, migration, foreign relations, transportation.
  • The feedback during the operation of a machine such as a computer or tool, for example the interaction between a driver and the position of his or her car on the road: by steering the driver influences this position, by observation this information returns to the driver.

Physics
Main articles: Force and Fundamental interaction

In physics, a fundamental interaction (depending on the nature of the interaction, it might also be called a 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 has been theoretically unified with the strong force in the standard model, but experimental results are yet to prove this.

Chemistry

Interactions between atoms and molecules:

Main articles: Molecular recognition, Intermolecular force, Noncovalent bonding, Hydrogen bond, van der Waals force, Aromatic interaction, Cation–pi interaction, Hydrophobic effect, Coordination complex, Metallophilic interaction, and Electronic correlation
See also: Interface (chemistry)

Molecular biology
Main articles: List of protein interactions and Interactome

In molecular biology, the knowledge on gene/protein interaction among themselves and with their metabolites is referred to as molecular pathways.

Medicine and pharmacology
Main article: Drug interaction
See also: Poly drug use § Dangerous interactions

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 fall generally into one of two main categories:

  1. pharmacodynamic : Involving the actions of the two interacting drugs.
  2. pharmacokinetic : Involving the absorption, distribution, metabolism, and excretion of one or both of the interacting drugs upon the other.

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 via same or similar mechanism. Examples are 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.
  • 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.

Biology and genetics
Main articles: Biological interaction, Gene–environment interaction, and Cell–cell interaction

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.

Communications
Main article: Interactivity

Sociology
Main article: Social interaction

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.

Statistics
Main article: Interaction (statistics)

In statistics, an interaction is a term in a statistical model in which the effect of two, or more, variables is not simply additive.

An example from statistics applied to health science

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.

Computers
Main article: Human–computer interaction
See also: Interaction cost, Interactive computation, and Interface (computing)

Media art

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.

See also

References
  1. Becky L. Drees; Vesteinn Thorsson; Gregory W. Carter; Alexander W. Rives; Marisa Z. Raymond; Iliana Avila-Campillo; Paul Shannon; Timothy Galitski (2005). "Derivation of genetic interaction networks from quantitative phenotype data". Genome Biology. 6 (4): R38. doi:10.1186/gb-2005-6-4-r38. PMC 1088966. PMID 15833125.

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