- A phenomenon of perception by exposure to an unstructured uniform stimulation field. It is caused by the brain amplifying neural noise in order to look for missing visual signals causing the visual system to shut down. --- Ganzfeld is a German term for the entire visual field; it describes the experiences of a snowbound arctic explorer or a pilot navigating in dense fog. When everything in the visual field is the same color and brightness, our visual system shuts down. White is equivalent to black is equivalent to nothing. When this occurs for a long period of time, we are likely to experience hallucinations. Prisoners held in isolation cells also experience this phenomenon. - [[Reductionism in Art and Brain Science]]