Serial recall in spatial acoustic environments: irrelevant sound effect and spatial source alternations.

Area of Science:

• Cognitive Psychology
• Auditory Perception
• Short-Term Memory

Background:

• Real-world listening involves complex acoustic scenes with background sounds and changing sound sources.
• The irrelevant sound effect (ISE) and spatial-source alternation effect (SSAE) impair short-term memory but are typically studied separately.
• Investigating both ISE and SSAE together enhances ecological validity in cognitive tasks.

Purpose of the Study:

• To investigate the combined effects of irrelevant background speech and spatial-source alternation on auditory-verbal serial recall.
• To determine how presentation rate and spatialization influence the ISE and SSAE.
• To bridge the gap between controlled lab experiments and complex real-world listening scenarios.

Main Methods:

• Experiment 1: Auditory-verbal serial recall with spatially alternating digits (1 item/s) and meaningful/meaningless background speech.
• Experiment 2: Serial recall with faster digit presentation (1 item/350 ms) and multiple spatial target locations.
• Utilized principles from ISE and SSAE research to create a complex auditory environment.

Main Results:

• Experiment 1 showed a significant ISE, with meaningful speech causing greater recall impairment, but no SSAE.
• Experiment 2 revealed an SSAE across all spatial locations when digit presentation rate was faster.
• Findings suggest SSAE is modulated by presentation rate and may be less prevalent in naturalistic listening.

Conclusions:

• The irrelevant sound effect is present with meaningful background speech, impacting serial recall.
• The spatial-source alternation effect emerges at faster presentation rates, suggesting temporal factors are crucial.
• Understanding these effects is vital for explaining cognitive management of competing auditory information in complex environments.