Searching working memory for the source of dual-task costs

Area of Science:

• Cognitive Psychology
• Neuroscience
• Human-Computer Interaction

Background:

• Dual-task costs vary based on stimulus and response modality pairings.
• Working memory (WM) literature shows domain-specific effects where related information competes for limited capacity.
• The relationship between modality-pairing effects and WM domain-specificity requires explicit examination.

Purpose of the Study:

• To investigate the link between modality-pairing effects on dual-task costs and domain-specificity in working memory capacity.
• To determine if response modality influences interference within domain-specific working memory processes.

Main Methods:

• Participants maintained sequences of either locations or tones in working memory.
• A choice reaction time task with constant stimuli but varying response modalities (vocal or manual) was administered.
• Interference effects on working memory performance were measured based on response modality.

Main Results:

• Vocal responses during the choice reaction time task interfered with working memory for tones.
• Manual responses interfered with working memory for locations.
• Response modality significantly affected the observed interference in working memory.

Conclusions:

• Response selection engages domain-specific working memory processes.
• Modality-pairing effects in dual-tasking can be explained by interference within these domain-specific WM processes.
• This research highlights the interaction between response modality and domain-specific working memory functions.