I remember a book from the 1980s set in the future. The main character was a boy traveling to see a relative (uncle? grandfather?), but you didn't actually have to travel anymore....Instead, his consciousness was transferred into a robot that looked just like him at his relative's place. The only way you could tell the difference between human and robot was this zipper like scar on the back or back of the neck??
I could have sworn this book was mentioned in Reading Rainbow.