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Area of Science:

  • Auditory Neuroscience
  • Cognitive Psychology
  • Speech and Hearing Sciences

Background:

  • Efficient listening in noise is crucial for hearing rehabilitation.
  • Limited understanding exists regarding how difficult listening conditions affect language processing.
  • Investigating neural mechanisms of semantic processing under auditory challenges is needed.

Purpose of the Study:

  • To evaluate the neural processes underlying semantic processing in challenging listening conditions.
  • To examine the impact of sentence context and response time deadlines on word processing.
  • To understand cognitive resource allocation during difficult auditory tasks.

Main Methods:

  • Thirty adults with normal hearing performed an auditory sentence processing task in 4-talker babble noise.
  • Event-related brain potentials (ERPs) were measured, focusing on the N400 component.
  • Stimuli varied in sentence context (high/low) and word expectation (expected/unexpected), with different response time deadlines (RTDs).

Main Results:

  • Behavioral accuracy decreased, and reaction times quickened with shorter response time deadlines (RTDs).
  • Larger N400 amplitudes were observed for words in low-context sentences with shorter RTDs, indicating reduced lexical access ease.
  • Increased neural resources were allocated for semantic processing and lexical access as listening difficulty rose.

Conclusions:

  • Difficult listening conditions increase the neural and cognitive demands for semantic processing and lexical access.
  • Response time deadlines may influence attentional allocation during language comprehension.
  • Situational listening demands significantly impact cognitive resource engagement in language processing, affecting listener experience.