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L

Language acquisition device
A hypothetical cognitive faculty by means of which one acquires one’s first language(s)

Langue
The linguistic system internalized by speakers of a language (as suggested by Ferdinand de Saussure), as opposed to parole, the act of speaking

Least noticeable difference
The smallest amount of change in sensory perception that  an individual is capable of noticing

Lesion
An injury or damage to an organ or a tissue of the body

Lexical retrieval
The finding of words from one’s lexicon; the vocabulary stored in one’s memory

Linguistic competence
The ability to use one’s language; what one knows about the rules and the usage of one’s language even without being aware of knowing it

Linguistic determinism
See Sapir-Whorf hypothesis

Linguistic performance
What one actually says, as opposed to one’s linguistic competence

Linguistic relativity
See Sapir-Whorf hypothesis

Link
In the human brain, a synapse between neurons that readily transmits nerve impulse as  a result of repeated experience; in a propositional or semantic network (whether relevant to human cognition or to artificial intelligence), a line relating concepts or nodes

LISP
A high level computer programming language

Localization of function
The notion that different cognitive functions of the human brain reside in particular locations in the brain

Logical positivist school
The school of thought concerned with the issue of the nature of truth that holds to the verification principle that there are two kinds of cognitively meaningful statements. The first are those that are true by virtue of their being empirically verifiable(true in the world), and the second kind includes those that are true by virtue of being linguistically verifiable (true because of the meanings of the words)

Longitudinal studies
Studies carried out over in an extended period of time on a particular subject or group of subjects

Long-term memory
The component of our memory system that retains material for a long time

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