EEG alpha synchronization is related to top-down processing in convergent and divergent thinking

Area of Science:

• Cognitive Neuroscience
• Neuroimaging

Background:

• Electroencephalography (EEG) alpha synchronization has been debated, with some viewing it as cortical idling and others linking it to active internal processing and creativity.
• Previous research suggests a connection between EEG alpha synchronization and creative thinking, prompting further investigation into its underlying mechanisms.

Purpose of the Study:

• To investigate the relationship between EEG alpha synchronization and internal processing demands during cognitive tasks.
• To determine if EEG alpha synchronization is associated with specific cognitive processes in creative thinking, differentiating between convergent and divergent thinking.

Main Methods:

• EEG was recorded during convergent and divergent thinking tasks under conditions of low and high internal processing demands.
• High internal processing demands were manipulated by masking stimuli after encoding to limit bottom-up processing.
• Analysis focused on frontal alpha synchronization patterns in relation to task type and processing demands.

Main Results:

• Frontal alpha synchronization was observed during both convergent and divergent thinking exclusively under high internal processing demands (top-down control).
• No significant frontal alpha synchronization was found when bottom-up processing was permitted (low internal processing demands).

Conclusions:

• Frontal alpha synchronization is primarily associated with top-down control and high internal processing demands.
• The findings suggest that frontal alpha synchronization is not specific to creative cognition but rather reflects a general cognitive control mechanism engaged during demanding tasks.
• This challenges the notion that EEG alpha synchronization is a unique neural correlate of creativity, proposing it reflects the cognitive load inherent in such tasks.