1. a homogeneous visual field, resulting from stimulation of both retinas by diffuse, uniform illumination. This is typically accomplished by looking through white spheres (or the halves of a ping-pong ball) in a dimly red-lit room.

2. in parapsychology experiments, a technique in which the participant is isolated from the sensory environment (e.g., by covering the eyes and placing headphones, usually playing white or pink noise, over the ears). [German, “whole field”; coined by Wolfgang Metzger]