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observer capable of stereopsis. To construct a typical stimulus of this class, the left eye view of Figure 1 is covered with a random pattern of dots. Then to make the right eye view, all dots falling within the boundaries of the stripe are shifted left by the amount that the stripe is shifted left in the right eye view. The dots in the left eye view which are "covered" by this shift, are omitted from the right eye view, and the "hole" created by the shift is filled up with some more randomly arranged dots. Finally, the boundary lines in Figure 1, that were used in making these dot stimuli, are erased, and we have constructed a "random-dot stereogram pair". A normal observer who looks only at one or the other eye view cannot see the stripe, as he could in Figure 1, but when the two views are put together ("fused") into a single image, a stripe of dots stands out in depth from the background of dots. A more detailed picture of the manipulations used to construct the random dot patters is shown in Figure 2 for a grid of 7 x 17 elements, a bar width of 4 elements, and a lateral shift between patterns of 2 elements. Each square in the grid is a possible dot position. If an observer views a succession of random-dot stereograms with, say, successive shifts in Depth Perception and "Random-Dot" Stimuli There are a number of ways in which we can tell, visually, the absolute or relative distances of objects from us. The most important way is stereopsis: in stereopsis, the brain interprets the slight differences between the views of the world through the left and right eyes to reveal the relative distances of objects in the field of view. An example of how stereopsis works is shown in Figure 1: When the brain puts together the left and right eye views into a single picture, the shaded stripe is seen as standing out in front of the background. In effect, in the left eye view one sees more background "around the left side" of the stripe, as if it were in front of the background, and one sees "around the right side"

A special-purpose computer system for on-line generation and display of "random-dot" stimuli for stereoscopic vision experiments