Its true, look at the standard layout of pretty much any family room in America and all the seating is oriented in a circle around the TV...like its some
oracle or something. It discourages people talking and no wonder so many families barely know each other.
When one is on in a restaurant or pub all eyes tend to wander towards the screen....mine included, its like an evil tractor beam.
There is actually a real argument for that, if anyone has ever read Aldous Huxley's "Doors of Perception" (the book that inspired Jim Morrison to name his band that),
it talks about a chemical gate in our brains that can be opened either via drugs or sparkly/shiny stimulus. Hence the fascination we have with things like diamonds,
chrome on cars and motorobikes, chandeliers, etc....value is placed on things that sparkle and light. I think the television offers the same stimulus to that part of the brain.
Plus, all brain tickling aside, I think it makes you dumb.