Effects of talker continuity and speech rate on auditory working memory

Area of Science:

• Cognitive Psychology
• Auditory Neuroscience
• Speech Perception

Background:

• Speech processing is less efficient with multiple talkers versus a single talker.
• Previous research focused on immediate or long-term speech recognition, showing varied effects of processing speed.
• The impact of multiple talkers on working memory maintenance remains less understood.

Purpose of the Study:

• To investigate how processing multi-talker speech affects working memory maintenance.
• To determine if talker variability disrupts the intermediate stage between perception and long-term memory.
• To examine the role of presentation rate in multi-talker speech interference on working memory.

Main Methods:

• A digit sequence recall task was employed with a 5-second delay.
• Seven-digit sequences were presented by either a single talker or multiple talkers.
• Three presentation rates (0, 200, 500 ms inter-digit intervals) were used.

Main Results:

• Recall was slower and less accurate for multi-talker sequences compared to single-talker sequences.
• The fastest presentation rate showed the most significant efficiency decrease with multiple talkers.
• Talker-specificity effects on speech working memory were most pronounced during rapid encoding.

Conclusions:

• Working memory for speech is susceptible to interference from talker variability.
• Rapid encoding of multi-talker speech particularly disrupts working memory efficiency.
• Talker variability may interfere with attentional focus, impacting working memory processing.