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In the laboratory stereoscopic perception is often slow, and perhaps for this reason its contribution to early visual processing has been neglected. It has long been known that stereoscopic depth can be perceived in briefly presented displays, but early work did not employ masking procedures or measure response times, and thus could not address how quickly disparity signals become available. We conducted experiments in which the task was to choose which side of a stereo LCD display contained a disk with 5 arcmin crossed disparity relative to background and fixation (dense RDS, disk diameter 2 deg, eccentricity 5 deg). The other location had a disk with 5 arcmin vertical disparity. The disks were displayed for 17, 34, 50, or 67 ms, and were followed immediately by a mask that remained until response. The disks were presented against a zero-disparity background. The mask was flat with 0 or 5 arcmin disparity …