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Search 3,717 documents across 34 fields — every claim tier-rated by evidence
180 results for "second language acquisition" — page 2 of 9
ZG_1_01 — Origin of Language — When Did Humans First Speak?
The origin of human language — the capacity for open-ended, recursive, symbolic communication — remains one of the most debated questions in science, lying at the intersection of linguistics, paleoanthropology, genetics,
ZG_1_20 — Sign Language & Gestural Origins of Language
The study of sign languages has profoundly transformed our understanding of both language and its evolutionary origins — demonstrating that language is modality-independent (not inherently tied to speech) and providing c
ZG_4_07 — Constructed Languages — Esperanto, Tolkien, and Beyond
Constructed languages (conlangs) are languages deliberately designed by individuals or groups rather than having evolved naturally — they range from international auxiliary languages (IALs) designed to facilitate cross-c
ZG_4_01 — Whistled and Drummed Languages — Long-Range Communication
Whistled and drummed languages are speech surrogates — communication systems that transpose the phonological or tonal structure of a spoken language into a non-vocal acoustic medium (whistling or drumming) capable of car
ZG_4_19 — Language Extinction Crisis
The world is experiencing an unprecedented crisis of linguistic diversity — of the approximately 7,168 living languages cataloged by Ethnologue (25th edition, 2022), an estimated 43% (3,045 languages) are classified as e
ZG_4_17 — Linguistic Relativity Update: Language, Thought, and the Sapir-Whorf Renaissance
Linguistic relativity — the hypothesis that the language one speaks influences one's perception, categorization, and cognition — has undergone a dramatic scientific renaissance since the late 1990s, moving from a discred
ZG_4_18 — Whistled Languages: Long-Distance Communication Through Tonal Transposition
Whistled languages — systems in which speakers transpose the phonological content of a spoken language into whistled melodies, preserving sufficient linguistic structure to carry complex messages over distances of 2–8 km
ZG_4_16 — Language Death and Endangerment: Mechanisms, Metrics, and Revitalization
Of the world's approximately 7,000 living languages, linguists estimate that 50–90% will cease to be spoken by the end of the 21st century — a rate of extinction that dwarfs biological species loss. A language "dies" whe
ZG_4_02 — Sign Language — Gestural Communication and Deaf Culture
Sign languages are fully developed natural languages that use the visual-gestural modality — hands, face, body, and spatial relationships — instead of the auditory-vocal channel to express the same range of linguistic co
ZG_3_05 — Language and Thought: Cognitive Semantics
The relationship between language and thought — whether the language we speak shapes, constrains, or determines how we perceive, categorize, and reason about the world — is one of the oldest and most debated questions in
ZG_3_02 — FOXP2 and the Genetics of Language
FOXP2 (Forkhead Box Protein P2) is the first gene directly linked to human speech and language ability, located on chromosome 7q31 and encoding a transcription factor that regulates hundreds of downstream genes involved
ZG_3_16 — Sign Language Typology: Structure, Diversity, and the Linguistics of Gesture
Sign languages — natural human languages that use the visual-gestural modality rather than the vocal-auditory channel — are among the most powerful demonstrations that human linguistic capacity is not bound to speech. Th
ZG_3_01 — Sapir-Whorf Hypothesis — Does Language Shape Thought?
The Sapir-Whorf hypothesis — more precisely, the principle of linguistic relativity — proposes that the structure of a language influences or determines the habitual thought patterns, perception, and worldview of its spe
Language_DNA_Migration_Triangulation
The last two decades have witnessed a revolution in our understanding of human migration history, driven by the integration of computational linguistics, paleogenomics, and archaeology into a unified analytical framework
T_5_13 — Psycholinguistics: Language and Thought, Sapir-Whorf, and the Cognitive Science of Language
Psycholinguistics — the scientific study of the cognitive processes underlying language comprehension, production, and acquisition — investigates how the mind/brain processes the ~1 billion words a person hears, reads, s
ZD_2_12 — Generative AI: Large Language Models, Diffusion, and the Transformer Revolution
Generative AI refers to artificial intelligence systems capable of creating new content — text, images, audio, video, code, 3D models — that is novel, coherent, and often indistinguishable from human-created work. The fi
L_5_07 — Genetics of Speech and Language: Beyond FOXP2
Language is humanity's most distinctive cognitive ability — and identifying its genetic basis has been a central goal of human genetics and neuroscience since the discovery of the KE family and the FOXP2 gene. The KE fam
H_3_17 — Linguistic Genocide: Language Suppression as Cultural Erasure
Linguistic genocide — the systematic, deliberate destruction of a people's language as a means of cultural erasure — has been a consistent tool of colonial and authoritarian regimes worldwide. Distinguished from natural
P_3_18 — Lacan Mirror Stage: Subjectivity, Language, and the Imaginary Order
Jacques Lacan (1901–1981), French psychoanalyst and psychiatrist, was the most original and controversial interpreter of Sigmund Freud's legacy in the 20th century. Lacan's central project was to "return to Freud" — to r
P_5_15 — Simone de Beauvoir: Ethics of Ambiguity and the Second Sex
Simone de Beauvoir (1908–1986) was one of the most important philosophers of the twentieth century — a foundational figure in both existentialist philosophy and feminist theory whose work has shaped debates on freedom, o
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