Alpha power increases in right parietal cortex reflects focused internal attention.

Area of Science:

• Cognitive Neuroscience
• Neuroimaging

Background:

• Increases in electroencephalography (EEG) alpha power are observed during memory tasks and divergent thinking.
• Alpha power elevation is associated with preventing external stimuli processing and engaging internal thought processes.

Purpose of the Study:

• To investigate the functional role of EEG alpha power increases during divergent thinking.
• To examine how task-specific bottom-up processing demands influence alpha power and performance.
• To explore the neural correlates of focused attention during demanding cognitive tasks.

Main Methods:

• Compared two divergent thinking tasks: a sensory-intake task (high bottom-up processing) and a sensory-independence task (low bottom-up processing).
• Manipulated stimulus masking to create conditions of high and low internal processing demands.
• Analyzed EEG alpha power and performance metrics.

Main Results:

• Internal processing demands affected performance and increased alpha power selectively in the sensory-intake task.
• The sensory-independence task exhibited sustained high task-related alpha power.
• Focused internal attention correlated with right parietal alpha power increases, potentially indicating ventral attention network inhibition.

Conclusions:

• EEG alpha power increases are functionally significant, particularly in tasks requiring controlled internal processing.
• Right-parietal alpha power modulation may reflect the inhibition of attention networks, supporting executive functions like task shielding.
• Findings contribute to understanding the neural mechanisms of focused attention and cognitive control during complex thought processes.