Iris folding is a paper craft technique that involves folding strips of colored paper in such a way to form a design.The center of the design forms an iris â a shape reminiscent of the iris diaphragm of a camera lens.istory [edit]. Iris folding originated in Holland, where early craft people made their designs using patterned paper cut from the inside of envelopes. Today, crafters use any light weight paper, such as scrapbook paper, origami paper, wrapping paper, the inside of envelopes or pages of magazines. Ribbon is also used.
Extinction is the disappearance of a previously learned behavior when the behavior is not reinforced. In this lesson, learn more about extinction in operant conditioning and test your knowledge with a quiz.
Extinction of behavior maintained by negative reinforcement. -Behaviors maintained by negative reinforcement are place on extinction (escape extinction) when those behaviors do not produce a removal of the aversive stimulus-The individual cannot escape from the aversive situation.sing extinction to refer to any decrease in behavior. -Some use the term extinction when referring to any decrease response performance, regardless of what produced the behavior change. -Labeling any reduction in behavior that reaches a zero rate of occurrence as extinction is a common misuse of the term. î î î.