Evaluating Pediatric Cochlear Implant Users' Encoding, Storage, and Retrieval Strategies in Verbal Working Memory

Area of Science:

• Auditory Neuroscience
• Cognitive Psychology
• Developmental Psychology

Background:

• Pediatric cochlear implant (CI) use impacts auditory processing and cognitive functions.
• Working memory, crucial for learning, involves distinct stages: encoding, storage, and retrieval.
• Understanding these components in CI users is vital for targeted interventions.

Purpose of the Study:

• To systematically examine the contributions of encoding, storage, and retrieval to working memory in pediatric CI users.
• To compare working memory component performance between long-term CI users and typically hearing children.
• To identify specific cognitive processes underlying working memory differences.

Main Methods:

• Forty-nine pediatric CI users and 56 typically hearing controls completed forward and backward span tasks using digits, pictures, and symbols.
• Phonological recoding speed was measured by rapid digit naming.
• Phonological storage was assessed via nonword repetition, and retrieval via vocabulary knowledge (Peabody Picture Vocabulary Test).

Main Results:

• Rapid digit naming speed and vocabulary knowledge significantly correlated with short-term and working memory span in both groups.
• Nonword repetition (phonological storage) only contributed to short-term memory models.
• Individual differences in encoding and retrieval explained significant working memory variability in both CI users and controls.

Conclusions:

• Working memory differences between pediatric CI users and typically hearing peers are primarily associated with encoding and retrieval processes.
• Phonological storage (nonword repetition) plays a limited role in explaining these working memory variations.
• Cognitive interventions for CI users should focus on enhancing encoding and retrieval strategies.