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Related Experiment Video

Updated: Oct 29, 2025

Measuring Delay Discounting in Humans Using an Adjusting Amount Task
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Interface Delay.

John Grinstead1

  • 1The Ohio State University, USA.

Journal of Child Language
|July 13, 2021
PubMed
Summary

The Interface Delay theory explains slow language development by focusing on the interaction between syntax and pragmatics, not the individual skills themselves. This developmental lag is observed in child Spanish, particularly with subject development and tense acquisition.

Area of Science:

  • Linguistics
  • Developmental Psychology
  • Cognitive Science

Background:

  • Syntactic development often exhibits delays in specific constructions.
  • These delays are frequently linked to discourse-pragmatic factors, particularly those involving definites.
  • Existing theories often attribute delays to individual cognitive domains, such as syntax or pragmatic abilities.

Purpose of the Study:

  • To introduce and elaborate on the Interface Delay theory of syntactic development.
  • To provide evidence for the theory using the development of subjects in child Spanish.
  • To explore the relationship between tense development and other linguistic phenomena.

Main Methods:

  • Review of existing literature on syntactic development and pragmatic influences.
Keywords:
child languageinterface delaymodularitymorphosyntaxspanish

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  • Analysis of child Spanish data focusing on subject development.
  • Examination of the correlation between tense acquisition and other grammatical features.

    • Main Results:

    • The Interface Delay theory posits that the interface between syntax and pragmatics, not the domains themselves, is slow to develop.
    • Child Spanish data illustrate this delayed growth trajectory, particularly in subject usage.
    • Delayed tense development correlates with delays in non-nominative case subject pronoun use and un-inverted wh-questions.

    Conclusions:

    • The Interface Delay theory offers a novel explanation for specific patterns of delayed syntactic development.
    • The interaction between cognitive domains is crucial for understanding language acquisition timelines.
    • Tense development plays a significant role in the emergence of other seemingly unrelated grammatical structures.