Stress leads to aberrant hippocampal involvement when processing schema-related information

Area of Science:

• Neuroscience
• Cognitive Psychology
• Memory Research

Background:

• Prior knowledge, organized as mental schemas, influences information processing.
• The medial prefrontal cortex (mPFC) coordinates schema use, interacting with parietal regions.
• The hippocampus is vital for encoding new information unrelated to existing schemas.

Purpose of the Study:

• To investigate the neural mechanisms underlying stress effects on schema-related memory encoding.
• To examine how acute stress impacts brain activity and connectivity during schema-based information processing.

Main Methods:

• Healthy participants underwent a stress or control manipulation.
• Neural activity was recorded using fMRI while participants processed schema-related and unrelated words.
• Memory recall was assessed several days after the encoding task.

Main Results:

• Processing schema-related information activated the mPFC, precuneus, and angular gyrus.
• Acute stress led to abnormal hippocampal activity and connectivity during schema-related information processing.
• This aberrant hippocampal engagement correlated with impaired subsequent memory performance.

Conclusions:

• Stress interferes with the brain's ability to effectively utilize prior knowledge during memory encoding.
• These findings highlight potential negative impacts of stress on learning and memory, particularly in educational contexts.