Stress Impact on Resting State Brain Networks

Area of Science:

• Neuroscience
• Brain Imaging
• Psychiatry

Background:

• Resting state brain networks (RSNs) are crucial for cognitive functions and are often disrupted in neuropsychiatric disorders.
• Stress is a known risk factor for neuropsychiatric conditions, but its specific impact on RSN architecture remains unclear.
• Understanding how stress affects RSNs is vital for developing targeted interventions.

Purpose of the Study:

• To investigate the impact of prolonged stress on the architecture and function of resting state brain networks (RSNs).
• To compare RSN activity patterns in individuals under prolonged stress versus healthy controls.
• To examine both resting-state activity and task-related deactivation patterns within RSNs.

Main Methods:

• Functional magnetic resonance imaging (fMRI) was employed to assess RSNs in stressed individuals and matched controls.
• Analysis included resting-state activity, deactivation patterns during task performance, and volumetric estimation of RSNs.
• Participants included individuals who had completed intense preparation for a medical residence selection exam (stressed group) and age/gender-matched controls.

Main Results:

• Stressed participants showed significantly greater activation in the default mode (DMN), dorsal attention (DAN), ventral attention (VAN), sensorimotor (SMN), and visual (VN) networks compared to controls.
• Impaired deactivation of RSNs was observed in the stressed group during task performance.
• A constriction of the DMN was noted in stressed individuals, correlating with observed brain atrophy patterns.

Conclusions:

• Prolonged stress significantly alters the activation and deactivation dynamics of resting state brain networks.
• These RSN alterations, including DMN constriction, may underlie various stress-induced cognitive and behavioral changes.
• The findings highlight the profound impact of stress on brain network organization and function.