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. Author manuscript; available in PMC: 2015 Mar 1.
Published in final edited form as: Ophthalmic Physiol Opt. 2014 Jan 12;34(2):199–213. doi: 10.1111/opo.12115

Figure 1.

Figure 1

Stimuli. A dichoptic nonius cross surrounded by a high contrast frame (above) and sinewave gratings presented to the two eyes (bottom). An observer’s task was to indicate the apparent location of the centre of the dark stripe in the perceived cyclopean sinewave grating relative to reference horizontal lines adjacent to its edge. The physical position of the reference lines was fixed, and its relative vertical position to the cyclopean sinewave grating varied from trial to trial in a staircase by shifting the phases of the two eyes’ sinewaves correspondingly.