The Structure of the Lexicon
Summary: A theoretical and psycholinguistic account of the mental lexicon — the brain’s word-store — as a multi-dimensional network where sound, meaning, and syntax are simultaneously organized, and where access to any word involves the activation and suppression of vast numbers of related items.
Sources: Physical book clipnotes/Library_Quotes_Batch_7.md
Source pages: Library Quotes Analysis: Batch 7 (Books 86-100 Selection)
Last updated: 2026-05-06
The mental lexicon as network
“The Mental Lexicon: A multi-dimensional network of sound, meaning, and syntax.” “A word is not a definition; it is a node in a vast, interconnected web.” “To know a language is to inhabit a specific architecture of thought.”
The mental lexicon is not a dictionary: it is not organized alphabetically or by definition. Words are stored and accessed through multiple simultaneous organizational schemes — by sound (phonological neighbors), by meaning (semantic fields), by grammatical category (syntactic class), by frequency, and by the contexts in which they appear. Every word is a node in all of these networks at once, and activating one node spreads activation through connected nodes. Compare langacker-cognitive-grammar: the symbolic units of cognitive grammar are exactly these form-meaning mappings stored as nodes in the lexical network.
Speed of access
“How does the brain find one specific word out of 60,000 in less than 200 milliseconds?” “The Librarian of the Mind, who organizes concepts by frequency, recency, and association.”
The speed of lexical access is one of psycholinguistics’ central puzzles: given 60,000 items, finding the right one in under a fifth of a second requires a radically parallel and non-exhaustive search process. The answer involves frequency (common words are accessed faster), recency (recently used words are primed), semantic priming (words in the same domain are pre-activated), and phonological priming (words that sound similar become temporarily more accessible). The librarian is not sequential but massively parallel. Compare pinker-selected-works on the mental lexicon in Words and Rules.
Spreading activation
“Spreading Activation: How thinking of one word (doctor) automatically ‘primes’ related words (nurse).” “Is the lexicon ever ‘finished’, or is it a living structure that grows until death?”
Spreading activation is the mechanism: activating one node automatically raises the activation levels of connected nodes. This explains lexical priming (reading “bread” makes you faster at responding to “butter”), tip-of-the-tongue states (partial activation of a word’s sound or meaning without full access), and semantic errors in aphasia (saying “cat” when you mean “dog”). The lexicon is not finished: it continues to grow — adding new words, strengthening recent connections, weakening unused ones — until the brain stops. Compare lewis-lexical-approach: chunks and collocations are the most highly activated multi-word nodes.
Lexical integrity
“The structure of our words is the final record of everything we have learned and thought.” “Lexical Integrity: The boundary that keeps a word a single, coherent unit of meaning.”
Lexical integrity is the principle that syntactic rules cannot look inside words — words are atomic for syntactic purposes. You can add “-s” to a noun but not extract the root from a compound and move it independently. The lexicon is the boundary between morphology and syntax. This is simultaneously a formal claim about linguistic architecture and a psycholinguistic one about how words are stored: as coherent units, not as decomposable structures assembled on the fly. Compare pinker-selected-works on the regular/irregular distinction in Words and Rules.