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Five major types of cultural diffusion have been defined: Expansion diffusion: an innovation or idea that develops in a source area and remains strong there, while also spreading outward to other areas. This can include hierarchical, stimulus, and contagious diffusion. Relocation diffusion: an idea or innovation that migrates into new areas ...
Three-dimensional rendering of diffusion of purple dye in water. Diffusion is the net movement of anything (for example, atoms, ions, molecules, energy) generally from a region of higher concentration to a region of lower concentration. Diffusion is driven by a gradient in Gibbs free energy or chemical potential.
Culture change. Culture change is a term used in public policy making and in workplaces that emphasizes the influence of cultural capital on individual and community behavior. It has been sometimes called repositioning of culture, [ 1] which means the reconstruction of the cultural concept of a society. [ 1] It places stress on the social and ...
Distance decay is a geographical term which describes the effect of distance on cultural or spatial interactions. [ 1] The distance decay effect states that the interaction between two locales declines as the distance between them increases. Once the distance is outside of the two locales' activity space, their interactions begin to decrease.
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Two-alternative forced choice. Two-alternative forced choice ( 2AFC) is a method for measuring the sensitivity of a person or animal to some particular sensory input, stimulus, through that observer's pattern of choices and response times to two versions of the sensory input. For example, to determine a person's sensitivity to dim light, the ...
The FitzHugh–Nagumo model ( FHN) describes a prototype of an excitable system (e.g., a neuron ). It is an example of a relaxation oscillator because, if the external stimulus exceeds a certain threshold value, the system will exhibit a characteristic excursion in phase space, before the variables and relax back to their rest values.
Chemotaxis (from chemo- + taxis) is the movement of an organism or entity in response to a chemical stimulus. [ 1] Somatic cells, bacteria, and other single-cell or multicellular organisms direct their movements according to certain chemicals in their environment.