Catholic Mental Prayer, also called Catholic meditation, is a form of silent prayer that is the next level advanced from vocal prayer.
It is not Eastern Mysticism or any such thing. It is instead a lifting of the heart and mind to God.
All the saints practiced it. St. Alphonsus Liguori said: "every saint became a saint through Mental Prayer."
Do your Mental Prayer in a completely quiet room or church to block out distractions. Your mind may jump around everywhere to worries, tasks you need to do, or fears, but you simply train it back to your topic of meditation.
Here is how you do Mental Prayer: