The idea is you focus on one of your senses; listening, seeing, tasting, smelling, touching or breathing, and when your mind wanders, which all minds do, you notice where your mind has gone and then, without any criticism, take or escort your focus back to one of the senses. When you give your full attention to any of these, your autopilot switches off, your mind stops ricocheting from past to future because you don't have to think about a sense, you just experience it. If you pay close attention to what you're immediately experiencing, you're right there in the present; the mind-wandering mode switches off. The brain of someone who is totally focused on one point (someone who has practised mindfulness even for a few days) has lowered amygdala activity (fear button is 'off'), he also has a steady heartbeat and normal blood pressure. He is in a state of well-being.
Ruby Wax: Sane New World