Speech processing performance of Hungarian-speaking twins and singletons

Area of Science:

• Developmental Psychology
• Linguistics
• Genetics

Background:

• Understanding genetic and environmental influences on speech acquisition is crucial for identifying developmental trajectories.
• Comparing twins and singletons offers unique insights into nature vs. nurture in child development.
• Speech processing abilities are foundational for phonological system development.

Purpose of the Study:

• To investigate speech processing differences between typically developing Hungarian-speaking twins and their singleton peers.
• To examine the impact of age and task type on speech processing performance in twins and singletons.
• To identify potential risks for developmental speech delays in twins compared to singletons.

Main Methods:

• A cohort of 384 Hungarian-speaking children (192 twins, 192 singletons) aged 5-9 years participated.
• Speech processing was assessed using four tasks: synthesized monosyllable repetition, nonsense word repetition, noisy sentence repetition, and phonologically complex sentence repetition.
• Performance data were analyzed for main effects of birth status, age, and task, as well as interaction effects.

Main Results:

• Singletons generally outperformed twins across most speech processing tasks.
• Significant main effects were observed for birth status, age, and task type.
• A three-way interaction indicated that the performance gap between twins and singletons varied by task and age.

Conclusions:

• Hungarian-speaking twins may have an elevated risk for developmental speech delays compared to their singleton peers.
• Speech processing performance in twins is influenced by task complexity and developmental age.
• These findings underscore the complex interplay of genetic and environmental factors in early speech development.