is perceived that does not fit a schema, many things can happen. One of the most common reactions is for a person to simply ignore or quickly forget the new information they acquired. This can happen on an unconscious level— meaning, unintentionally an individual may not even perceive the new information. People may also interpret the new information in a way that minimizes how much they must change their schemata. For example, Bob thinks that chickens don't lay eggs. He then sees a chicken laying an egg. Instead of changing the part of his schema that says "chickens don't lay eggs", he is likely to adopt the belief that the animal in question that he has just seen laying an egg is not a real chicken. This is an example of disconfirmation bias, the tendency to set higher standards for evidence that contradicts one's expectations. This is also known as cognitive dissonance. However, when the new information cannot be ignored, existing schemata must be changed or new schemata must be created (accommodation). Jean Piaget (1896–1980) was known best for his work with development of human knowledge. He believed knowledge was constructed on cognitive structures, and he believed people develop cognitive structures by accommodating and assimilating information. Accommodation is creating new schema that will fit better with the new environment or adjusting old schema. Accommodation could also be interpreted as putting restrictions on a current schema, and usually comes about when assimilation has failed. Assimilation is when people use a current schema to understand the world around them. Piaget thought that schemata are applied to everyday life and therefore people accommodate and assimilate information naturally. For example, if this chicken has red feathers, Bob can form a new schemata that says "chickens with red feathers can lay eggs". This schemata, in the future, will either be changed or removed entirely. Assimilation is the reuse of schemata to fit the new information. For example, when a person sees an unfamiliar dog, they will probably just integrate it into their dog schema. However, if the dog behaves strangely, and in ways that doesn't seem dog-like, there will be an accommodation as a new schema is formed for that particular dog. With accommodation and assimilation comes the idea of equilibrium. Piaget describes equilibrium as a state of cognition that is balanced when schema are capable of explaining what it sees and perceives. When information