An ellipse discrimination with four distinct levels of difficulty was developed which provided a wide range of alternative responses rather than a binary choice. S‘s task was to judge in which of 6 clock orientations the minor axis of the ellipse was oriented. Although this procedure was evolved as propaedeutic to studying the effects of incidental, “subliminal,” unbeknown stimulation on such a discrimination, it should prove useful in other contexts whenever a difficult ellipse discrimination is required.
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