Anatomical differences between the brains of 85 people have been measured and linked with the four main categories of personality types as defined by psychiatrists using a clinically recognised system of character evaluation.
“There is no point shouting at a child who is very shy and telling them off, because it does not come naturally to them to put themselves forward. But actually knowing there is a biological basis for this helps educators or parents to use the right approach to help a child to compensate.”
This is a complete non sequitur. If two people behave differently, it necessarily follows that there are biological differences that underpin the behaviors. Because we are all, you know, made of stuff. Biological stuff. Demonstrating structural differences between brains says absolutely nothing about whether personality is “determined at birth.”