The constant din of advertising invading all senses and inputs begins to lower the ability to focus. A bit like the intellect averaging earpiece that Vonnegut wrote about in his short story in which all people were handicapped to a suitably average level (forget the title, can find it in Welcome to the Monkey House).

Visiting a foreign underdeveloped country can be highly restorative. You don't realize you are in a noisy place until the noise is stopped and the volume of the newly emtpied void makes itself felt.