Using dichotic listening to study bottom-up and top-down processing in children and adults

Area of Science:

• Cognitive Psychology
• Developmental Neuroscience
• Auditory Perception

Background:

• Top-down attention modulates sensory processing.
• Children exhibit developing cognitive control compared to adults.
• Dichotic listening tasks reveal hemispheric processing advantages.

Purpose of the Study:

• To investigate how children and adults modulate bottom-up auditory processing with top-down attention.
• To examine developmental differences in cognitive flexibility during auditory tasks.
• To explore the impact of conflicting attentional demands on ear advantage.

Main Methods:

• Utilized a dichotic listening paradigm with voiced and unvoiced consonant-vowel syllables.
• Manipulated bottom-up stimulus strength and top-down attentional focus (left vs. right ear).
• Compared performance of 30 children and 30 adults under varying stimulus demands.

Main Results:

• Auditory stimulus voicing influenced the strength of the right ear advantage (REA).
• Children performed significantly worse than adults when stimulus properties conflicted with attention.
• Children demonstrated less cognitive flexibility in modulating the REA under conflicting conditions.

Conclusions:

• Children's ability to flexibly shift auditory attention is less developed than adults'.
• Conflicting bottom-up and top-down processing significantly challenges children's performance.
• Dichotic listening with manipulated stimulus demands offers a novel method for studying cognitive development.