I don't have any specific title suggestions, but I would definitely recommend you choose a topic that you can evaluate in a lot of detail as that is where a lot of the marks for the essay come from. You could potentially pick 2 topics, do some research into both of them and then choose the topic with most evaluative potential? How long do you get to complete the EPQ at your school may I ask?
You will struggle to correlate brain physiology with criminality per se, as the idea that the criminal brain is somehow different to that of the non-criminal has long been debunked. However, you may be interested in looking at the effects of early childhood trauma and neglect on brain development and physiology? There's lots of recent work showing how these are related, and there is a forensic dimension in that people who have survived trauma and neglect in infancy tend to show more anti-social behaviours, substance use problems etc. Here's a US summary https://www.childwelfare.gov/pubPDFs...evelopment.pdf
Edit - Its got more to do with Psychology but looks in depth as of how a child may be shaped into a future 'criminal' so to speak.
That would make sense to pick topics with a lot of detail, thanks. And I am not sure how long we get to complete our EPQ, we are having an assembly on it next week. I would imagine it will be a few months.
If you have a few months then I’d definitely recommend emailing some specialists in the broad topic you’re interested in as they can sometimes suggest some sources and are an excellent source of information themselves - I emailed some researchers at my local uni, and it took them a few weeks to get back to me but the info I obtained from them was really good, and I even cited them in my essay
Just remember that a successful EPQ has a narrowly drawn, tight title that's easy to directly answer in the available word count. Don't be too broad - it's the worst mistake to make when setting your title, but your EPQ supervisor should be able to help you avoid this.