What may be called the “extended mind” can be very hard to define. For example, is it different from ordinary waking consciousness, or is it hiding in the open? Where does it start and end?
Richard Lang illuminates the concept by using very simple exercises in this series of short videos featured on The Extended Mind page, entitled: “Who are we really?”
His website can be found at: Headless.org
Note: I am not associated in any way with this method of self-inquiry, but it is useful, particularly for those new to such concepts.