Unitary language construct: vocabulary, grammar, and listening comprehension reflect a common language factor¶

Theory · All theories
Evidence · 5 claims (2 for, 1 mixed, 2 against) · 2 studies (1 quant-synthesis, 1 review), q2–q3 · 1 of 2 report an effect size · 5 claims rest on one study

Description¶

The review's first theoretical perspective holds that linguistic comprehension develops with high interdependence across domains and modalities. Citing longitudinal latent-variable studies, it reports that "Bornstein et al. (2014) found a unitary core language construct from early childhood to adolescence" and that Klem et al. (2015) found a unidimensional latent language factor defined by sentence repetition, vocabulary, and grammatical skills. A latent language factor explained 95% of the variation in listening comprehension (Lervåg et al., 2017). The review uses this to justify synthesizing effects across language outcome measures.

Design Implications¶

Context¶

Requirements¶

• Latent-variable longitudinal studies correcting for measurement error underpin the construct's support

Constraints¶

• The review notes a stable rank order of children's vocabulary knowledge is preserved across preschool and school years, implying altering relative language levels is complex

Target Learners¶

• children aged 4–6 through adolescence

Target Learning Objectives¶

• linguistic comprehension
• vocabulary
• grammar
• listening comprehension

Claims¶

• Differential Language Outcomes Small Vocabulary Grammar Moderate Narrative Listening [+M]
• Linguistic comprehension instruction shows no clear immediate effect on generalized reading comprehension outcomes [-W]
• Linguistic comprehension instruction shows a small immediate effect on generalized linguistic comprehension outcomes [+W]
• Vocabulary-focused programs are probably insufficient to accelerate vocabulary development and close the vocabulary gap [~W]
• Reading and listening comprehension are not unitary: both consist of similar and different subskills [-W]

Related Theories¶

• Simple View of Reading: reading comprehension as the product of decoding and linguistic comprehension
• Unified taxonomy of subskills shared between and exclusive to reading and listening comprehension
• Simple View of Reading as the organizing framework for Spanish MAP Reading Fluency

Examples¶

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Key Sources¶

• Rogde K, Hagen ÅM, Melby‐Lervåg M, Lervåg A. (2019). The effect of linguistic comprehension instruction on generalized language and reading comprehension skills: A systematic review. Campbell Systematic Reviews. https://doi.org/10.1002/cl2.1059