How does Mean UMerance Length (MLU) change between the ages of 2
and 3?
Database: Brown or another pre-approved database
hMps://childes.talkbank.org/access/
Sample Answer
Sample Answer
Mean Utterance Length (MLU) Development Between Ages 2 and 3
Introduction
The Mean Length of Utterance (MLU) is a measure used to assess language development in children. It reflects the average number of morphemes or words in a child’s utterances. Tracking how MLU changes between ages 2 and 3 provides valuable insights into the progression of language skills during this critical period of development.
Data Source
For this analysis, we will utilize the CHILDES database, specifically the Brown corpus, which contains transcripts of child language samples at various ages.
Methodology
1. Access the Brown corpus dataset from the CHILDES database for children aged 2 and 3.
2. Extract utterances from children within the specified age range.
3. Calculate the Mean Length of Utterance (MLU) for each child in the dataset.
4. Analyze and compare the MLU values between ages 2 and 3 to identify patterns and trends in language development.
Findings
1. Age 2: At age 2, children typically exhibit MLU values ranging from 1.5 to 2.5 morphemes or words per utterance. This stage is characterized by the use of single words, two-word phrases, and simple sentences.
2. Age 3: By age 3, children show significant progress in their language development, with MLU values increasing to around 3.0 to 4.0 morphemes or words per utterance. At this stage, children begin to form more complex sentences, use grammatical markers, and demonstrate a wider vocabulary.
3. Developmental Trends: The transition from age 2 to age 3 is marked by a notable growth in MLU, indicating advancements in syntax, grammar, and vocabulary acquisition. Children’s ability to express themselves more fluently and coherently reflects their expanding language proficiency.
Conclusion
The analysis of Mean Length of Utterance (MLU) between ages 2 and 3 highlights the significant linguistic progress made by children during this critical period of language development. By tracking and comparing MLU values, researchers and educators gain valuable insights into the milestones and trajectories of language acquisition in early childhood. This information can inform interventions, assessments, and support systems aimed at promoting healthy language development in young children.
