In the operant conditioning paradigm, extinction refers to the process of no longer providing the reinforcement that has been maintaining a behavior. Operant extinction differs from forgetting in that the latter refers to a decrease in the strength of a behavior over time when it has not been emitted.
Gel medium is an acrylic product. It comes in Heavy, Soft, and Regular and has a variety of finishes, Matte, Gloss and Semi-gloss. The basic use for these is to build texture in paintings by mixing them with acrylic paint. If you add a small bit of it to your paint it will also extend the drying time. The Soft gel is the medium that is most often used by paper artists. It can be used as a glue for collage and it is also used to make photocopy transfers.
Gels are formed by the interlocking of the particles of solid dispersion medium in the form of a loose frame work inside which liquid is contained. When the gel is allowed to stand for a long time it shrinks and loses the entire liquid held by it. This shrinking of gel is termed as syneresis or weeping. Classification of gels: Gels are classified into elastic and non elastic gels.