Ganzfeld ("whole field") technique was developed to quiet this external noise by providing a mild, unpatterned sensory field to mask the noise of the outside world. In the typical ganzfeld experiment, the telepathic "sender" and "receiver" are isolated, the receiver is put into the ganzfeld state, and the sender is shown a video clip or still picture and asked to mentally send that image to the receiver.

The receiver, while in the ganzfeld, is asked to continuously report aloud all mental processes, including images, thoughts, feelings. At the end of the sending period, typically about 20 to 40 minutes in length, the receiver is taken out of the ganzfeld, and shown four images or videos, one of which is the true target and three are non-target decoys. The receiver attempts to select the true target, using perceptions experienced during the ganzfeld state as clues to what the mentally "sent" image might have been. With no telepathy, chance expectation allows us to predict that the correct target would be selected about 1 in 4 times, for a 25% "hit rate." After scores of such experiments, presently totaling about 700 individual sessions conducted by about two dozen investigators, world-wide, the results show that the target image is selected on average 34% of the time. This is a highly significant result, suggesting that telepathy, at least as operationally defined in this experiment, exists.

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