Language Quotient

Late bilinguals show spatially separated representations in Broca's area; early bilinguals share the same region. Language Quotient measures what IQ tests miss: the difference between knowing a word and knowing the brain that uses it.

Kim et al.'s 1997 Nature paper on bilingual brain organization is the founding image of Cooper's Language Quotient: late bilinguals (acquired second language as adults) show spatially separated representations in Broca's area; early bilinguals share the same region. Language is not one thing. It is several, and they are visible on fMRI.

The LQ volume tracks the working psychometric instruments — CEFR (Common European Framework of Reference), ACTFL, DIBELS — and the neural architecture of Broca's area, Wernicke's area, the arcuate fasciculus, and the white-matter pathways that connect them. Cooper's framework counts native fluency, second-language fluency, and pragmatic communication as three separate sub-domains, with the compensatory model letting any of the three carry weight when the others are constrained.

Short volume. Companion to the main VQ-Trade book.

• The Language Instinct — Steven Pinker
• The Language Myth — Vyvyan Evans
• Born to Talk — Lloyd Hulit
• The Stuff of Thought — Steven Pinker

Linguists, language educators, bilingual-development researchers, cognitive-science readers.