Although these symptoms are all present, they may not always be evident.
Research has shown that the sociopath is usually a person with an abundance of charm and wit.
Visible symptoms include physical aggression and the inability to hold down a steady job.
The sociopath also finds it hard to sustain relationships and shows a lack of regret in his or her actions.
Jake Williams, a respected US cybersecurity researcher, said they have worked on various projects, including training material, and the Briton always refused payment. I can't reconcile the charges with what I know about him.
I don't doubt that some of his code found it's way into malware.
The 23-year-old, who found a 'kill-switch' that derailed the attack that crippled the NHS in May, was granted bail under strict conditions that he pay 30,000 dollars (£23,000) and remain in the US.