The neural effect of stimulus-response modality compatibility on dual-task performance: an fMRI study

Area of Science:

• Cognitive Neuroscience
• Neuroimaging
• Human Brain Function

Background:

• Functional magnetic resonance imaging (fMRI) studies implicate the inferior frontal sulcus (IFS) in managing cognitive interference during dual-task performance.
• Previous research suggests the IFS plays a role in coordinating interfering processes when individuals perform multiple tasks simultaneously.

Purpose of the Study:

• To investigate if the compatibility between stimulus and response modalities influences dual-task-related activity in the IFS.
• To further delineate the specific functions of the IFS in dual-task coordination.

Main Methods:

• Participants performed modality-compatible and modality-incompatible single and dual tasks.
• Blood-oxygen-level-dependent (BOLD) signals were measured using fMRI to assess IFS activity.
• Behavioral dual-task costs were calculated to quantify task interference.

Main Results:

• Behavioral data confirmed higher dual-task costs in modality-incompatible conditions compared to modality-compatible conditions.
• fMRI analysis revealed significantly greater IFS activation during modality-incompatible dual tasks versus modality-compatible dual tasks, accounting for inter-individual variability.
• This finding was robust even when considering individual differences in brain organization.

Conclusions:

• The IFS is involved in coordinating cognitive processes related to mapping sensory information to motor responses during dual-tasking.
• Beyond temporal order coordination, the IFS plays a crucial role in managing modality-specific interference in dual-task scenarios.
• Modality compatibility significantly impacts neural resource allocation within the IFS during concurrent task execution.