Does being undemonstrative to your kids make them feel neglected?

I think there is a difference between being demonstrative and being unresponsive. Some parents are by nature not very demonstrative and openly emotional, but they are very responsive to their children's need for attention or comfort. You can be calm and responsive or very emotional and responsive - depending on your own temperament style. The main point is to be responsive to your child's cues and not ignore it. Responses are variable with the child's age - physical responses like hugging are more commonly used for younger children and attention and conversation may be more appropriate for older kids.