Neural adaptation and cognitive inflexibility in repeated problem-solving behaviors

Area of Science:

• Cognitive Neuroscience
• Neuroimaging
• Human Behavior

Background:

• Neural adaptation, a reduction in neural activity with repeated stimulus processing, enhances novelty detection but may impair subsequent flexibility.
• Understanding the impact of neural adaptation on cognitive flexibility is crucial for comprehending mental set formation.

Purpose of the Study:

• To investigate dynamic changes in neural adaptation during repeated problem-solving.
• To assess the negative influence of neural adaptation on subsequent non-repetitive problem-solving behaviors.

Main Methods:

• Functional magnetic resonance imaging (fMRI) was employed using a Chinese character decomposition task.
• Participants repeatedly solved practice problems with a loose chunk decomposition (LCD) solution before a test problem requiring a tight chunk decomposition (TCD) solution (enhanced-set condition).
• Brain activity was compared between the enhanced-set and a base-set condition where problems alternated.

Main Results:

• Reduced neural activity (percent signal changes) was observed in the cuneus, superior parietal lobule (SPL), inferior frontal gyrus (IFG), and medial prefrontal cortex (mPFC) during repeated practice, indicating neural adaptation.
• Greater activation in SPL and IFG was found in the enhanced-set condition for both test and subsequent practice problems, suggesting increased task switching costs.
• Neural adaptation from repetitive problem-solving was linked to cognitive inflexibility and an undifferentiated impact on task switching.

Conclusions:

• Repeatedly using the same solution for similar problems induces neural adaptation and cognitive inflexibility.
• This neural adaptation negatively affects subsequent cognitive flexibility, particularly in task switching scenarios.
• Findings contribute to understanding the neurocognitive mechanisms of mental set formation and the influence of neural adaptation on cognitive processing.