Hello, everyone. Do you ever feel like you’re trapped in a cycle of negative thoughts? I certainly do. Especially when I’m busy with work or feeling exhausted, I tend to lean toward pessimistic perspectives. But is this a scientifically proven fact?
While it slightly deviates from general “fatigue,” I would like to introduce a study regarding “sleep deprivation and thinking patterns” (Reference 1).
Does Sleep Deprivation Lead to Negative Thinking? (Reference 1)
This refers to the famous study on sleep and the amygdala by Professor Walker and colleagues. In this research, brain activity was analyzed using fMRI on participants who were either sleep-deprived or well-rested. The experiment observed their reactions when viewing images designed to evoke negative impressions.
The results showed that in sleep-deprived individuals, the amygdala’s activity intensity increased by +60%, and the activated volume expanded by 3 times. This indicates that sleep deprivation makes one significantly more susceptible to experiencing intense negative emotions.
Furthermore, while well-rested individuals showed activity in the prefrontal cortex when viewing negative images, sleep-deprived individuals showed increased activity in the brainstem. This suggests that while a rested brain engages in activity to suppress negative emotions, a sleep-deprived brain fails to do so, instead activating the autonomic nervous system (triggering a physical stress response).
It is fascinating to see that feelings we experience in our daily lives are being demonstrated experimentally. It truly highlights the power of fMRI as a method for observing brain activity. Reading this paper reminded me of a time I felt overwhelming anxiety after pulling an all-nighter for work… (This is just a personal anecdote, but still!) It’s a good reminder that we need to plan our work more effectively. Until next time!
【Reference１】
Yoo, S. S., et al. (2007). “The human emotional brain without sleep — a prefrontal amygdala disconnect.” Current Biology. DOI: 10.1016/j.cub.2007.08.007
【Key Terminology(by Gemini)】
- fMRI (Functional Magnetic Resonance Imaging): A neuroimaging technique used to diagnose which parts of the brain are active, when, and how.
- Amygdala: A brain region that functions as the center for emotional processing, particularly “survival-related emotions” such as anxiety, fear, and anger.
- Prefrontal Cortex: A brain region responsible for logical thinking, planning, maintaining focus, and emotional regulation (inhibition).
- Brainstem: The part of the brain that controls fundamental life functions that occur unconsciously, such as breathing, heart rate, body temperature, and sleep cycles.
- Autonomic Nervous System: Receives commands from the brainstem to regulate the functions of organs and blood vessels throughout the body. It consists of the sympathetic and parasympathetic nervous systems.
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