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Related Concept Videos

Components of Language01:24

Components of Language

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Language, whether spoken, signed, or written, consists of specific components: lexicon and grammar. The lexicon is the vocabulary of a language, comprising its words. Grammar is the set of rules used to convey meaning through the lexicon. For example, English grammar adds “-ed” to most verbs to indicate past tense. Words are formed by combining phonemes, which are the basic sound units of a language. Different languages have different sets of phonemes (e.g., “ah” vs.
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Language and Cognition01:27

Language and Cognition

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Language serves as a bridge between ideas and communication, influencing how individuals perceive and interact with the world. Psychologists have long debated whether language shapes thought or vice versa. This discussion gained grip with Edward Sapir and Benjamin Lee Whorf in the 1940s, who proposed that language determines thought, a concept known as linguistic determinism. They suggested that the vocabulary and structure of a language influence how its speakers think and perceive reality.
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Language Development01:22

Language Development

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Children master language quickly and with relative ease, supported by both biological predisposition and reinforcement. B. F. Skinner (1957) proposed that language is learned through reinforcement, while Noam Chomsky (1965) argued that language acquisition mechanisms are biologically determined.
The critical period for language acquisition suggests that the ability to acquire language is at its peak early in life. As people age, this proficiency decreases. Language development begins very...
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Language01:16

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Language is a unique communication system that uses words and systematic rules to organize and transmit information. Unlike other forms of communication, which may involve postures, movements, odors, or vocalizations, language relies on symbols and grammar. This makes human communication distinct from that of other species, who also communicate but do not use language in the same way humans do.
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Higher Mental Functions of the Brain: Language01:10

Higher Mental Functions of the Brain: Language

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Language is a system of communication that allows the expression of thoughts, ideas, and feelings. The brain processes language in both hemispheres.
Language formation and comprehension take place in the dominant hemisphere. The dominant hemisphere is responsible for understanding the meaning of spoken, written, or sign language, as well as the ability to communicate. For most people, the left hemisphere is the dominant one. The right hemisphere, then, gives tone and emotional context to the...
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Lateralization01:28

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Brain lateralization refers to the division of mental processes and functions between the two hemispheres of the brain, a phenomenon that optimizes neural efficiency and underpins complex abilities in humans. This specialization allows each hemisphere to perform tasks where it has a comparative advantage, facilitating more refined cognitive capabilities across different domains.
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Related Experiment Video

Updated: Sep 7, 2025

Lexical Decision Task for Studying Written Word Recognition in Adults with and without Dementia or Mild Cognitive Impairment
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A syntax-lexicon trade-off in language production.

Neguine Rezaii1, Kyle Mahowald2, Rachel Ryskin3

  • 1Frontotemporal Disorders Unit, Department of Neurology, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114.

Proceedings of the National Academy of Sciences of the United States of America
|June 16, 2022
PubMed
Summary

Individuals with primary progressive aphasia (PPA) and healthy speakers exhibit a trade-off between lexical and syntactic complexity in spoken language. This suggests a general principle in how humans convert thoughts into speech.

Keywords:
primary progressive aphasiasyntactic complexitysyntax frequencysyntax–lexicon trade-offword frequency

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Area of Science:

  • Neuroscience
  • Linguistics
  • Psychology

Background:

  • Spoken language production requires selecting words and grammatical structures.
  • Individuals with primary progressive aphasia (PPA) present with varying language deficits.
  • Neuropsychological observations suggest potential compensatory strategies in language production.

Purpose of the Study:

  • To investigate the relationship between lexical and syntactic complexity in spoken language.
  • To test the hypothesis of a syntax-lexicon trade-off in individuals with PPA and healthy speakers.
  • To determine if this trade-off is a general property of speech production.

Main Methods:

  • Analysis of natural language productions from individuals with PPA (n=79) and healthy controls (n=99).
  • Introduction of a novel frequency-based method for quantifying syntactic complexity in utterances.
  • Assessment of lexical richness and syntactic complexity through frequency measures.

Main Results:

  • A significant negative correlation was observed between lexical and syntactic complexity in the PPA group.
  • This syntax-lexicon trade-off was also identified in healthy individuals during a picture description task.
  • The findings indicate that speakers may adjust word choice and grammatical structure to maintain clarity.

Conclusions:

  • A reciprocal relationship exists between lexical and syntactic choices during spoken language production.
  • This syntax-lexicon trade-off appears to be a fundamental characteristic of human speech.
  • The study provides insights into the cognitive mechanisms underlying language formulation.