“According to this perspective, once skills become automatized, thinking about the declarative knowledge while trying to perform the skill actually disrupts the smooth performance of it. Think, for example, of trying to drive a car or skate while intentionally thinking about and preparing every move. With enough practice, procedural knowledge eclipses the declarative knowledge, which, in time, may be forgotten. For this reason, fluent speakers may not even realize that they once possessed the declarative knowledge that set the process in motion.”