Answer:
To develop your ability at extrasensory perception (ESP) you first need to be able to control and suppress your other senses and calm your body functions so that you can increase your concentration on input to your brain from other avenues besides sight, sound, taste, smell, and touch. This can be done with biofeedback and/or sensory deprivation, until you can use meditation to suppress them on your own.
Sensory deprivation, for instance, has the user float naked in a tank of supersaturated salt water (for maximum buoyancy) that is kept at body temperature. This removes your sense of touch. The tank is sealed shut with the air circulated, also kept at body temperature and filtered to remove smells. Also the tank is light and sound proof so it eliminates sight smell and hearing. Now that your senses are gone, spend as much time in the tank as you can concentrating on "reaching out" with your mind. Also let your body remember how it feels (or doesn't) without any senses. You want to get used to this so that you can re-create this state out of the tank just by meditating on your body's memory of this.
Once you feel you are as good as you can get with the above then get or make a set of Psychic flash cards. They are about 6" by 10" posterboard, white on one side with the pictures of a square, a triangle, a circle, a cross, and a set of 3 wavy parallel lines on the other. Your "subject" holds the cards with the pictures facing them and the blank side facing you. Ask them to concentrate on each picture as they move from one card to the next. You, once in your meditative state, must concentrate on the picture they have formed in their mind. You tell them what you "see" and they write down whether it's right or not.
Just guessing randomly you have a 25% chance of getting any one card correct. If you are getting anything over 5 cards correct in a set of 20, that shows increased ESP. Keep practicing!