In a study of clairvoyance, a "sender" in one room attempts to communicate the content of pictures to a "receiver" in a separate isolated room whose eyes are covered by Ping-Pong balls that have been cut in half, and whose job it is to detect the images that are being sent. This methodology is called:

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The methodology described, with a sender attempting to communicate information to a receiver in an isolated room with covered eyes, is the ganzfeld procedure commonly used in studies of clairvoyance and psychic ability. The other three choices (Gestalt technique, motion parallax technique, and Müller-Lyer procedure) are unrelated to this type of study.

In a Study of Clairvoyance, a "Sender" in One Room