Parallel and serial processing in dual-tasking differentially involves mechanisms in the striatum and the lateral...

Area of Science:

• Cognitive Neuroscience
• Neuroimaging

Background:

• Response selection is crucial for dual-task performance.
• Dual-tasking can utilize parallel or serial response selection modes.
• Neuroanatomical correlates of these distinct processing modes remain unclear.

Purpose of the Study:

• To investigate the distinct functional neuroanatomical correlates of parallel versus serial response selection during dual-tasking.
• To explore how different stimulus onset asynchronies influence processing modes.

Main Methods:

• Functional magnetic resonance imaging (fMRI) was employed.
• A psychological refractory period (PRP) paradigm was utilized.
• Varying stimulus onset asynchronies manipulated processing modes between serial and parallel.

Main Results:

• Parallel response selection in dual-tasking is associated with striatal activity.
• Serial response selection in dual-tasking is associated with lateral prefrontal cortex activity.
• Mathematical constraints helped interpret processing modes.

Conclusions:

• Lateral prefrontal cortex and striatal regions are differentially involved in dual-task response selection modes.
• These brain regions appear optimized for specific processing modes (serial vs. parallel).