The ‘Old Feeling’ You Can’t Shake: How Past Experiences Shape Present Reactions

You might find yourself in a moment that, on the surface, seems manageable — a comment from your partner, a shift in someone’s tone, a small rupture in connection. And yet, your reaction feels immediate and intense. Part of you knows, this doesn’t fully make sense, but another part of you feels like you’ve been here before.

You might be talking to your sibling — you’re aware of your history together, the different roles you’ve each played, and how your childhood experiences shaped those dynamics. But then they do that thing again. You notice something shift inside you. Your body tightens. You feel irritated, or anxious, or suddenly unsure of yourself. Or a partner’s mild frustration lands like deep criticism and part of you might think, “Why is this bothering me so much?”. On the surface, these moments are small, but your reaction doesn’t feel small. And that gap between what’s happening and how it feels can be disorienting.

What’s Actually Happening: Your Brain Is Making Connections

Our brains are constantly making associations between present experiences and past ones. When something in the current moment feels even subtly familiar — a tone, an expression, a dynamic — it can activate an entire network of earlier experiences. What you’re feeling isn’t just about now; it’s your nervous system responding to patterns it already knows.

This is something your brain does automatically. When you go through an emotionally significant experience, your brain doesn’t just store the memory. It stores the feeling, the body sensations, and the meaning you made in that moment. Over time, these experiences get grouped together.

For example, if a dog bit you when you were a child, your brain might store that experience in a kind of “danger” category. Along with the memory of the bite, it also stores the fear, the adrenaline, and the meaning “I’m not safe.” So later in life, if you encounter a dog, even one that’s friendly, your body might react quickly. You might feel a spike of anxiety, the urge to run, or a feeling of shutting down. It can feel confusing, but your brain isn’t only responding to this moment. It’s responding to what this moment connects to.

This is why a tone of voice can echo a parent’s tone, feeling dismissed can connect to earlier experiences of not being seen, and conflict can activate a deeper fear of disconnection. All of this happens outside of conscious awareness —you’re not choosing to react this way. Your nervous system is recognizing a pattern and trying to respond based on what it has learned before.

Why It Feels So Disproportionate

One reason these reactions can feel confusing is that the emotional intensity doesn’t seem to match the situation. In these moments, many people pause and wonder: “Why am I reacting like this?”  “This doesn’t feel proportional.” There’s a real gap between what’s happening externally and what you’re feeling internally. On the outside, it might be a short response, a shift in tone, or a minor conflict. But on the inside, it can feel like rejection, criticism, disconnection, or even a sense of threat.

What’s important to understand is that you’re not just reacting to what’s happening right now. If you were only responding to the present, your reaction might be more contained. But when the past is layered in, the emotional charge gets amplified. And once you understand that, the question often shifts from: “What’s wrong with me?” to something much more accurate: “What does this connect to?” 

The Resistance: “Why Do I Have to Look at the Past?”

There are many reasons people don’t want to revisit the past — it might feel unnecessary, exhausting, or simply irrelevant. But this work isn’t about forcing you to relive everything you’ve been through or analyzing your childhood in detail. It’s about understanding whether something from the past is still active in your present-day reactions. Because if it is, it will continue to show up.

You can have insight and understand your patterns but still find yourself reacting in ways that feel familiar. This is where the distinction matters. We’re not looking at the past to dwell on it. We’re looking at it to see if something there is still influencing how your nervous system responds today. And if it is, that’s something we can actually work with and shift.

How EMDR Thinks About This

EMDR approaches this a bit differently than traditional talk therapy. Instead of starting with the past for its own sake, it begins with what’s happening now — the reactions, triggers, or patterns you’re noticing — and uses those as a guide to identify where something may have first taken root. In this way, the work is focused and grounded in your current experience.

So rather than asking, “Tell me everything about your childhood,” we start with something much more relevant: “What’s happening for you right now?” It might be a reaction you keep having in relationships, a situation that triggers anxiety or shutdown, or a pattern you understand, but can’t seem to shift.

Your current reactions become the starting point. They give us clues about what your system is responding to — and where that response may have first developed. From there, we follow those breadcrumbs back only as far as we need to so we can identify and process the experiences that are still influencing how you feel today.  

The “Neural Network” Idea  Made Simple

Experiences in our lives aren’t stored as isolated memories — they’re linked together in networks that include emotions, body sensations, and beliefs. When one part of that network is activated, the whole system can light up, often beyond conscious awareness. This is why a present-day moment can bring up a reaction that feels much bigger than what’s actually happening.

Imagine that a meaningful experience, especially one that felt emotionally intense, forms the trunk of a tree. Over time, similar experiences get linked to it, like branches growing out in different directions. Each branch holds pieces of that experience: thoughts, emotions, body sensations, and the meaning you made about yourself or the world. So instead of memories being stored as separate events, they’re connected. 

Now fast forward to the present. Something small happens — maybe someone gives you feedback or their tone shifts slightly. On the surface, it’s just one moment. But if that moment connects to this network, suddenly the whole system lights up. 

This is why your reaction can feel so immediate and intense. And because these networks operate largely outside of conscious awareness, it can feel like it’s happening to you, rather than something you understand in the moment. 

What Healing Actually Looks Like

As these earlier experiences are processed and integrated, the intensity of present-day reactions often begins to shift. The same situation may still matter, but it no longer feels so consuming. Instead of feeling pulled into something automatic, you’re able to respond with more clarity. This shift is often subtle at first, but meaningful. 

Where you might have once spiraled into anxiety or react quickly or shut down, there's now a bit more space. You can still feel what you’re feeling but it doesn’t take over in the same way. It’s not just that you’re coping better or managing the reaction differently. The reaction itself begins to change. Because the underlying experiences that were driving it are no longer carrying the same emotional charge. And that shift isn’t just something you understand,  it’s something you experience.

Why This Work Is Worth It

When the past is no longer quietly shaping your reactions, there’s often a greater sense of internal coherence. Relationships can feel less reactive and your emotional responses begin to feel more aligned with what’s actually happening. 

You’re no longer constantly trying to manage reactions that feel confusing or out of proportion. Instead of being pulled into the chaos, you’re able to stay grounded even as things are happening around you. Your responses start to match what’s actually happening rather than being shaped by something older. You’re not as caught in the moment.
There’s a greater sense of perspective — like you can see the whole picture, not just get pulled into it.

In relationships, this can look like feeling less reactive in moments of tension, being able to stay present during conflict, not immediately assuming disconnection or criticism, and being able to find the right words to say and from your authentic self.

Internally, there’s often a shift too. You might notice less second-guessing, less emotional overwhelm, more clarity in how you feel and what you need, and a stronger sense of connection to yourself. And over time, this builds something deeper: a sense of trust in yourself.