A large format optical display for the generation of generalized psychophysical stimuli

An optical display is described that can be used to generate a wide variety of psychophysical stimuli. The display has the advantages of large size, high brightness, excellent uniformity, and ease of automation. The basis of the device is that two parallel diffuser plates separated by a distance are a low-pass filter for spatial frequencies. The filtering characteristics of the device can be adjusted by a suitable choice of the diffusing materials and by varying the separation between the two plates. A device constructed using these principles is described in detail.