Decoding of Working Memory Contents in Auditory Cortex Is Not Distractor-Resistant

Area of Science:

• Neuroscience
• Cognitive Psychology
• Auditory Perception

Background:

• Sensory cortex is implicated in working memory maintenance.
• Previous studies show visual cortex can maintain memory alongside distractors.
• The capacity of auditory cortex to maintain memory under distraction is unclear.

Purpose of the Study:

• To investigate if auditory cortex maintains working memory content during auditory distraction.
• To compare the effects of passive versus active auditory distraction on working memory.
• To explore the role of higher-order brain regions in distractor-resistant working memory.

Main Methods:

• Functional magnetic resonance imaging (fMRI) was used to measure brain activity.
• Participants memorized target sound pitch and compared it to a probe sound after a delay.
• Auditory distraction (passive or active) was introduced during the memory delay period.

Main Results:

• Pitch-specific memory information was decodable in auditory cortex without distraction.
• Decoding of target sounds in early auditory cortex dropped to chance level with auditory distraction.
• Memory performance decreased significantly under both passive and active distraction.

Conclusions:

• Early auditory cortex is insufficient for maintaining working memory content under performance-impairing distraction.
• Auditory distraction disrupts the maintenance of auditory working memory representations.
• Higher-order frontal and parietal regions may play a role in distractor-resistant working memory storage.