Should we blame our behaviour on our past or our brain?

When we behave out of character, most of us don’t look outward.

We turn inward; we feel regret and shame. “That’s not who I want to be.”

So should we blame our past, our trauma, our neurodiversity? Or, should we simply apologise and promise to do better next time?

Neuroscience gives us a more honest and uncomfortable answer.

Our past and our brain do influence our behaviour.

Decades of research show that past experiences, particularly trauma, leave measurable imprints on the brain.

Stress and adversity alter how the amygdala (threat detection), hippocampus (memory), and prefrontal cortex (self‑control) communicate with one another.

In simple terms, when the brain feels threatened, regulation drops before intention arrives.

The same applies to neurodivergence. ADHD, autism and related neurodevelopmental profiles involve differences in self‑regulation, emotional processing, and impulse control, particularly under stress.

Yes, our brain, traits and our past shape our reactions.

But there is a difference between a reason and an excuse.

Research from top universities consistently shows that while neurobiology constrains behavioural flexibility, it does not remove responsibility.

Trauma can reduce regulation in the moment, neurodivergence can make change harder, and stress narrows behavioural options.

However, none of these erase accountability.

What research does show is that behaviour change requires capacity, not just insight.

When the prefrontal cortex is offline, through overwhelm, fatigue, trauma activation, or sensory overload, the brain defaults to learned patterns, not values.

So what does responsibility look like?

✔️ Owning the behaviour

✔️ Naming context (without hiding behind it)

✔️ Apologising cleanly

✔️ Actively working on regulation, not just intention

This is supported across trauma‑informed neuroscience, behaviour change research, and neurodiversity‑affirming models.

Your past may explain why something was hard. Our brain may explain why it happened faster than our choice, but responsibility lies in what we do afterwards.

Blame doesn’t change behaviour, shame doesn’t either. Understanding paired with accountability does.

Let’s talk!

(Yale School of Medicine; Harvard/McLean Hospital – Trauma & Resilience Lab).

(Stanford Neurodiversity Project; Scientific Reports, Nature Group, 2025).

(Frontiers in Psychology, 2023; BJPsych Open, 2025).

(Psychology Today – Neurobiology of Trauma).

(Harvard & Yale trauma research; Stanford Neurodiversity Project).