This is Sparta
The critical period hypothesis was first proposed by Montreal neurologist Wilder Penfield and co-author Lamar Roberts in their 1959 book Speech and Brain Mechanisms, and was popularized by Eric Lenneberg …
An interlanguage is the term for a dynamic linguistic system that has been developed by a learner of a second language (or L2) who has not become fully proficient
This video explains what Universal Grammar is in Simple Terms
The monitor hypothesis asserts that a learner’s learned system acts as a monitor to what they are producing.