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After someone important to you dies, you may find yourself doing things

that don't make sense.

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You reach for your phone to text them.

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You hear a familiar sound or visit a familiar place and, for just a moment,

expect them to be there.

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You forget why you entered a room. You lose track of conversations. Simple decisions feel strangely difficult. You may know that the person has died, yet some part of you still seems to be searching for them.

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It can be unsettling.

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But there is a reason this happens.

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Grief is not only something we feel emotionally. Loss also asks the brain to learn an entirely new reality.

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Your Brain Knew Them, Too

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Before the loss, your brain had built an understanding of your everyday world.

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It knew where this person fit within your life—the sound of their voice, the places you saw them, the ways you communicated, the routines you shared, and countless other details you probably never consciously thought about.

Your brain learned through experience: This person is part of my world.

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In The Grieving Brain, neuroscientist and psychologist Mary-Frances O'Connor explains that the brain is constantly making predictions based on what it has experienced before. She uses the example of a rat learning its way through a maze.

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When a rat repeatedly travels through a maze and finds food in the same place, its brain learns where to expect it. Our brains also learn through repeated experience.

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For years—or perhaps decades—your lived experience taught your brain where and how to expect this person in your life. Maybe they were beside you every day. Maybe you called them every Sunday. You saw them at work, gathered with them on holidays, exchanged messages throughout the week, or simply knew where they were in the world.

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Then the person dies.

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You may intellectually understand that they are gone, but your brain still knows the old pathways and where they used to lead.

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So it keeps following them.

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You reach for the phone.

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You think you see them in a crowd.

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You find yourself expecting them at a familiar place or gathering.

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You think, I need to tell them about this.

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And then reality arrives again.

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These moments do not mean that you are refusing to accept the death or somehow grieving incorrectly. Your brain is encountering an old expectation in a world where that expectation can no longer be fulfilled.

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Learning this changed reality takes time.

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Grief Takes Energy

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This kind of learning is exhausting.

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Concentration may become difficult. Memory can feel unreliable. Decisions that once seemed simple may suddenly feel overwhelming.

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At the same time, everyday life continues to ask things of you.

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There may be practical responsibilities created by the death, work to return to, family members to care for, or simply the ordinary demands of life continuing while your mind feels anything but ordinary.

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Perhaps we need to rethink the expectation that a grieving person should quickly return to functioning exactly as they did before.

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They are not simply carrying sadness.

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Their brain is doing the difficult work of adapting to profound change.

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The Brain Learns Through Experience

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O'Connor explains that the brain gradually updates its understanding as it encounters new experiences over time.

Life continues, but differently.

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A birthday passes.

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A child graduates, or a new grandchild is born—and their absence is felt in a moment you wish they could have been there to see.

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A holiday or gathering arrives and someone is missing.

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Sometimes there is no milestone at all.

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It is an ordinary day, a familiar song, an inside joke, a place you once went together, or something you instinctively want to tell them.

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Life continues to bring experiences that remind us both that the person is no longer physically here and how deeply they remain part of us.

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This does not mean forgetting the person who died. And it certainly does not mean that love or connection disappears.

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The brain gradually learns how to navigate life without their physical presence, while memories, connection, and the significance of that relationship remain part of the life that continues.

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You Are Not Behind

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Research on bereavement also reminds us that grief does not move neatly through predictable stages, and no two people will experience a loss in exactly the same way.

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The relationship matters. The circumstances of the death matter. Your life before the loss matters. Your support system matters.

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You matter.

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So if your mind still feels foggy, if certain moments still catch you off guard, or if something that happened months—or even years—ago can suddenly feel painfully close again, perhaps the question doesn't need to be:

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Why am I still like this?

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Maybe a gentler question is:

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What has my mind and body been asked to carry?

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Because grief asks an extraordinary amount of us.

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Your brain is learning a world it never expected to live in.

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And that kind of learning deserves time, patience, and compassion.

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