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Child-Directed Speech Facilitates Semantic Role Learning: A Machine Learning Approach
Eva Huber1,2, Balthasar Bickel1, Sabine Stoll1
1Institute for the Interdisciplinary Study of Language Evolution, University of Zurich, Zurich, Switzerland.
Open Mind : Discoveries in Cognitive Science
|May 20, 2026
Summary
Child-directed speech aids language acquisition by enhancing semantic role learning in both English and Russian. This specialized input helps children map meaning to syntax more effectively than adult-directed speech.
Area of Science:
- Developmental psycholinguistics
- Computational linguistics
- Language acquisition
Background:
- Semantic roles (agent, patient) are crucial for mapping meaning to syntax in language acquisition.
- Child-directed speech (CDS) is a primary input source, but its effect on semantic role learning is understudied, especially in diverse languages.
- English and Russian differ significantly in encoding semantic roles, presenting unique learning challenges.
Purpose of the Study:
- To investigate if child-directed speech (CDS) facilitates semantic role learning compared to adult-directed speech (ADS).
- To examine the impact of CDS on semantic role interpretation and generalization in English and Russian.
- To analyze statistical properties of CDS and ADS using artificial neural language models.
Main Methods:
- Utilized artificial neural language models to analyze naturalistic child-directed and adult-directed speech corpora in English and Russian.
- Study 1: Assessed the ease of classifying semantic roles in CDS versus ADS utterances.
- Study 2: Evaluated language models trained on CDS and ADS for their ability to learn and generalize semantic roles on a controlled test set.
Main Results:
- Semantic roles were more easily classified in CDS than ADS, with a stronger effect observed in Russian.
- Language models trained on CDS demonstrated superior learning and generalization of semantic roles compared to those trained on ADS, across both languages.
- CDS appears optimized for languages with diverse semantic role expressions, like Russian, and supports generalization to novel structures.
Conclusions:
- Child-directed speech is tailored to children's language-specific needs, actively facilitating semantic role acquisition.
- Effective learning and generalization of semantic roles from CDS support the foundational mapping of meaning onto syntactic structure.
- Findings provide the first evidence for CDS actively aiding semantic role acquisition, a prerequisite for syntax development.
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