Volitional control of attention and brain activation in dual task performance

Area of Science:

• Cognitive Neuroscience
• Neuroimaging

Background:

• Understanding how the brain manages attention is crucial for cognitive science.
• Previous research suggests attention influences neural processing, but the precise mechanisms of strategic control are debated.

Purpose of the Study:

• To investigate the neural effects of willfully allocating attention between two simultaneous tasks using functional MRI (fMRI).
• To determine if brain activation patterns can be strategically controlled by attention-dividing instructions.

Main Methods:

• Functional MRI (fMRI) was employed in a dual-task paradigm.
• Participants performed auditory sentence comprehension and mental rotation tasks, individually and concurrently.
• Attention was manipulated by instructing participants to focus on one task, the other, or both.

Main Results:

• Brain activation distribution was systematically modulated by attention-dividing instructions.
• Language processing regions showed reduced activation when attending to mental rotation, and visuospatial regions showed reduced activation when attending to sentences.
• Dual-task activation was underadditive compared to the sum of single-task activations.
• A leftward laterality shift in language regions was observed in the dual-task condition compared to attending to sentences.

Conclusions:

• Neural activation is amenable to strategic attentional control.
• Task-specific brain regions dynamically adjust their activation levels based on attentional focus.
• Underadditivity in dual-task activation may be linked to distinct language processing modes and attentional demands.