Short-Term Audiovisual Spatial Training Enhances Electrophysiological Correlates of Auditory Selective Spatial...

Area of Science:

• Auditory Neuroscience
• Cognitive Psychology
• Human Factors Engineering

Background:

• Spatial hearing is crucial for navigating complex auditory environments, like the
• cocktail-party
• scenario.
• Event-related potential (ERP) components, such as the N2, are linked to auditory selective spatial attention.
• Cross-modal training, particularly audiovisual, is explored for its potential to enhance auditory processing.

Purpose of the Study:

• To investigate how short-term audiovisual cross-modal training affects event-related potential (ERP) components related to auditory selective spatial attention.
• To compare the efficacy of audiovisual-congruency training versus visual-feedback training in a
• cocktail-party
• scenario.
• To examine age-related differences in training-induced modulations of auditory spatial attention.

Main Methods:

• Forty-five healthy participants (younger and older adults) underwent three 15-minute training conditions: audiovisual-congruency, visual-feedback, or control.
• Participants performed an auditory spatial attention task before and after training, localizing a target word amidst distractors.
• Event-related potentials (ERPs) were analyzed, focusing on N2 amplitudes and distributed source analysis.

Main Results:

• Audiovisual-congruency training significantly increased N2 amplitudes in younger adults compared to other training conditions.
• Older adults did not show significant N2 amplitude changes after audiovisual-congruency training.
• Source analysis revealed enhanced neural activity in the dorsolateral prefrontal cortex (Brodmann area 9) in younger adults post-audiovisual-congruency training.

Conclusions:

• Short-term audiovisual-congruency training can enhance neural correlates of auditory selective spatial attention in younger adults.
• The findings suggest that cross-modal training can effectively modulate attention mechanisms in complex auditory scenes.
• Age may influence the effectiveness of audiovisual training for improving auditory spatial attention.