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That’s why everyone hates each other nowadays,’ he reckoned. ‘Because they are overloaded with non-friends friends. Ever heard about Dunbar’s number?’
And then he had told her about a man called Roger Dunbar at Oxford University, who had discovered that human beings were wired to know only a hundred and fifty people, as that was the average size of hunter-gatherer communities.
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Matt Haig (The Midnight Library)
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However, sometimes an event may occur that is so disturbing that it overloads the brain and prevents it from completing this all-important memory-processing task. Instead, the memory gets stored along with the physical sensations and negative emotions, where it is easily, and often repeatedly, triggered in our everyday lives.
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Katherine Andler (Self-Guided EMDR Therapy & Workbook: Healing from Anxiety, Anger, Stress, Depression, PTSD & Emotional Trauma)