Toward a model of dichotic listening performance

Area of Science:

• Auditory Perception
• Cognitive Psychology
• Neuroscience

Background:

• Dichotic listening tasks assess auditory processing and hemispheric asymmetry.
• Controlled attention is crucial for understanding how auditory information is selected and reported.

Purpose of the Study:

• To investigate dichotic listening performance for various speech sounds under controlled attention.
• To examine the influence of competing sound features on target identification.
• To explore the role of attention in auditory processing and right-ear advantage (REA).

Main Methods:

• Participants performed dichotic listening tasks with controlled attention.
• Speech sounds were categorized by phonetic features (place, voice, manner).
• Target and competing item interactions were analyzed, alongside false alarm and intrusion rates.

Main Results:

• Target accuracy decreased when competing sounds shared phonetic features (place, voice, manner).
• Significant right-ear advantage (REA) observed for nasals and stops.
• Intrusions were more frequent from the right ear when attending to the left.

Conclusions:

• Attention acts as a late-stage filter, selecting stimuli after the REA has occurred.
• Dichotic listening performance is influenced by both stimulus localization ease and evidence strength.
• A proposed model integrates localization and evidence factors for predicting performance.