The Secret to Stress Adaptation Lies in the Brain "One Hour Later"!
A world-first discovery reveals that brain activity related to psychological resilience peaks about 60 minutes after experiencing stress, not immediately. This finding highlights the brain's shift from an alarm state to an introspective mode as the key to recovery, suggesting new optimal timings for stress interventions in mental health and education.
📋 Article Processing Timeline
- 📰 Published: March 26, 2026 at 23:18
- 🔍 Collected: March 28, 2026 at 21:59 (46h 41m after Published)
- 🤖 AI Analyzed: April 14, 2026 at 23:22 (409h 22m after Collected)
[Points] Discovered for the first time in the world, through simultaneous measurement of fMRI (functional magnetic resonance imaging) and EEG (electroencephalogram), that brain activity related to psychological resilience (mental stress adaptability) appears most strongly not immediately after receiving stress, but "about 60 minutes later". Identified that the key to recovery is the brain's alarm (salience network) quieting down and switching to an introspective mode (default mode network). With the optimal state and intervention timing for enhancing resilience being substantiated, there are expectations for more effective stress countermeasures in mental health and educational settings.
[Overview] A research group led by Assistant Professor Noriya Watanabe (currently Associate Professor at the Faculty of Informatics, Shizuoka Institute of Science and Technology) and Professor Masaki Takeda at the Brain Communication Research Center, Research Institute, Kochi University of Technology, has elucidated for the first time in the world the brain mechanism when humans demonstrate psychological resilience (*1), which is the ability to adapt to stressful environments. Using an advanced measurement method that simultaneously employs fMRI (functional magnetic resonance imaging) (*2), which has excellent spatial resolution, and EEG (electroencephalogram) (*3), which has excellent temporal resolution, the research group recorded detailed brain activity for an extended period immediately after acute stress was applied. As a result, while conventional resilience research mainly focused on responses immediately after stress, they discovered that human-specific resilience appears in the brain after a significant time lag of about 60 minutes from the stress (see Figure 1). These research results suggest a new intervention timing (time window) for mental health care and educational support in a stressful society, and were published in the highly influential international comprehensive science journal PNAS (Proceedings of the National Academy of Sciences).
Figure 1. Temporal changes in brain networks related to psychological resilience.
The upper row shows functional network changes by fMRI. Each band on the outer circumference of the circle indicates a brain region, and connected lines indicate that those regions are acting in synchronization. About 60 minutes later, in individuals with high resilience, the activity of the introspective mode network centered on the posterior cingulate cortex reached its peak, while in those with low resilience, strong activity in the network related to the brain's alarm was observed.
The lower row shows changes in the strength of high beta components (associated with stress and tension) by EEG. Immediately after receiving stress, no significant difference was observed between people with high and low resilience, but about 60 minutes later, high beta components appeared strongly over a wide range in people with low resilience.
[Research Content and Results]
Previous resilience research has mainly consisted of animal experiments, evaluated by simple behavioral indicators such as whether they "show depression-like behavior" even under severe stress. However, human resilience is not merely insensitivity to stress, but is intricately intertwined with advanced psychological processes such as past experiences, self-efficacy, and a positive attitude. This research group delved into this "human-specific stress adaptation mechanism," which had previously been a black box.
In this study, changes after applying acute stress via a cold stimulus were precisely tracked for about 90 minutes in approximately 100 participants.
Multifaceted measurement: In addition to fMRI and EEG, heart rate, respiration, pupillary response, and even stress hormones (salivary cortisol) were simultaneously measured to comprehensively record brain and body dynamics.
Utilization of psychological scales: Using the international resilience evaluation scale (CD-RISC) (*4), the "mental flexibility" of individuals was quantified and compared with brain activity.
As a result of the analysis, it was found that brain activity related to resilience appears as a distinct characteristic for the first time not immediately after stress, but about 60 minutes after the load. This is a discovery that overturns the conventional theory that "the brain's stress response peaks within 30 minutes".
Specifically, fMRI observations showed that in individuals with higher resilience, the salience network (SaN) (*5), which controls stress responses and tension, clearly settled down after 60 minutes, while the default mode network (DMN) (*6), which is involved in introspection and self-referential processing, became more active. Furthermore, even with EEG, at the same "about 60 minutes later," brainwaves in the high beta band (high β) *7, which are associated with stress and tension, significantly decreased. On the other hand, in people with low resilience, the opposite pattern was observed (see Figure 2).
Figure 2. Brain representation related to resilience that appeared 60 minutes after stress load.
The fact that two measurement methods with different characteristics, fMRI and EEG, consistently pointed to the same time period of "60 minutes later," supports the extremely high reliability of these results. This research captures what cannot be grasped by animal models, showing how humans adjust their own minds...
[Overview] A research group led by Assistant Professor Noriya Watanabe (currently Associate Professor at the Faculty of Informatics, Shizuoka Institute of Science and Technology) and Professor Masaki Takeda at the Brain Communication Research Center, Research Institute, Kochi University of Technology, has elucidated for the first time in the world the brain mechanism when humans demonstrate psychological resilience (*1), which is the ability to adapt to stressful environments. Using an advanced measurement method that simultaneously employs fMRI (functional magnetic resonance imaging) (*2), which has excellent spatial resolution, and EEG (electroencephalogram) (*3), which has excellent temporal resolution, the research group recorded detailed brain activity for an extended period immediately after acute stress was applied. As a result, while conventional resilience research mainly focused on responses immediately after stress, they discovered that human-specific resilience appears in the brain after a significant time lag of about 60 minutes from the stress (see Figure 1). These research results suggest a new intervention timing (time window) for mental health care and educational support in a stressful society, and were published in the highly influential international comprehensive science journal PNAS (Proceedings of the National Academy of Sciences).
Figure 1. Temporal changes in brain networks related to psychological resilience.
The upper row shows functional network changes by fMRI. Each band on the outer circumference of the circle indicates a brain region, and connected lines indicate that those regions are acting in synchronization. About 60 minutes later, in individuals with high resilience, the activity of the introspective mode network centered on the posterior cingulate cortex reached its peak, while in those with low resilience, strong activity in the network related to the brain's alarm was observed.
The lower row shows changes in the strength of high beta components (associated with stress and tension) by EEG. Immediately after receiving stress, no significant difference was observed between people with high and low resilience, but about 60 minutes later, high beta components appeared strongly over a wide range in people with low resilience.
[Research Content and Results]
Previous resilience research has mainly consisted of animal experiments, evaluated by simple behavioral indicators such as whether they "show depression-like behavior" even under severe stress. However, human resilience is not merely insensitivity to stress, but is intricately intertwined with advanced psychological processes such as past experiences, self-efficacy, and a positive attitude. This research group delved into this "human-specific stress adaptation mechanism," which had previously been a black box.
In this study, changes after applying acute stress via a cold stimulus were precisely tracked for about 90 minutes in approximately 100 participants.
Multifaceted measurement: In addition to fMRI and EEG, heart rate, respiration, pupillary response, and even stress hormones (salivary cortisol) were simultaneously measured to comprehensively record brain and body dynamics.
Utilization of psychological scales: Using the international resilience evaluation scale (CD-RISC) (*4), the "mental flexibility" of individuals was quantified and compared with brain activity.
As a result of the analysis, it was found that brain activity related to resilience appears as a distinct characteristic for the first time not immediately after stress, but about 60 minutes after the load. This is a discovery that overturns the conventional theory that "the brain's stress response peaks within 30 minutes".
Specifically, fMRI observations showed that in individuals with higher resilience, the salience network (SaN) (*5), which controls stress responses and tension, clearly settled down after 60 minutes, while the default mode network (DMN) (*6), which is involved in introspection and self-referential processing, became more active. Furthermore, even with EEG, at the same "about 60 minutes later," brainwaves in the high beta band (high β) *7, which are associated with stress and tension, significantly decreased. On the other hand, in people with low resilience, the opposite pattern was observed (see Figure 2).
Figure 2. Brain representation related to resilience that appeared 60 minutes after stress load.
The fact that two measurement methods with different characteristics, fMRI and EEG, consistently pointed to the same time period of "60 minutes later," supports the extremely high reliability of these results. This research captures what cannot be grasped by animal models, showing how humans adjust their own minds...