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Evaluating the Language ENvironment Analysis System for Korean.

Margarethe McDonald¹, Taeahn Kwon², Hyunji Kim³

¹Department of Communication Sciences and Disorders, University of Wisconsin-Madison.

Journal of Speech, Language, and Hearing Research : JSLHR

|March 2, 2021

Summary

The Language Environment Analysis (LENA) system shows reliable accuracy for Korean language environments, comparable to its performance in other non-English settings. Factors like speaker pitch and background noise can affect its precision.

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Area of Science:

Computational Linguistics
Developmental Psychology
Speech Technology

Background:

The Language Environment Analysis (LENA) system, trained on American English, requires validation for use with other languages.
Accurate measurement of language exposure is crucial for understanding child development and linguistic acquisition.

Purpose of the Study:

To evaluate the accuracy and reliability of the LENA system when applied to the Korean language.
To compare LENA's automated measures of language environment with human coder analyses for Korean speech data.

Main Methods:

Analysis of sixty 5-minute audio recordings from 38 Korean children (7-18 months old).
Calculation of LENA's identification error rate, precision, and recall against human coders.
Correlation analysis between LENA and human counts for adult word count, child vocalization, and conversational turns.

Main Results:

LENA's identification error rate for Korean was 64-67%, similar to previous studies.
Correlation for adult word count (r=0.78-0.79) was comparable to other studies; child vocalization (r=0.34-0.47) and conversational turns (r=0.36-0.47) showed moderate correlations.
Child vocalization correlation fell within ranges observed for other non-European languages.

Conclusions:

The LENA system demonstrates comparable reliability for Korean language environments as for other non-English settings.
Speaker characteristics (pitch, utterance duration) and environmental factors (noise) influence LENA's diarization accuracy.
LENA is a viable tool for analyzing Korean language environments, with awareness of potential influencing factors.