system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:Why do most mentally disabled people share a lot of the same traits?

( head tilted to the side, arm tucked to the chest, etc.)
gpt
They don't.

People with similar disabilities share similar traits. You notice the ones with these traits because you associate them with mental disabilities.

Many people that are intellectually delayed are relatively "normal" in appearance. They simply are less able to develop adaptive behaviors that help with society's definitiion of normal. Example would be fetishizing of specific body parts, normally people would not go to strangers and attempt to touch those parts but an IDD person would have less impulse control since to them they're just partaking in something they like and the thought that the other person might not be willing doesn't cross their mind.