“…With such a display, all Ss again repart "dynamic sequential displacement, " but with movement from Ieft to right in the top line and the opposite movement, Le., from right to left, in the bottom line, as would be expected if the effeet is central in origin. An earlier study (Simon & Jackson, 1968) showed that when a dot was used as an observation stimulus (SO) and was introduced in a concept·identification learning task, it significantly facilitated learning if it was relevant (RSO), Le., occurred over the relevant dimension, and significantly retarded learning if it was irrelevant (ISO), Le., occurred over an irrelevant dimension. This effect also occurred when the SO was introduced for the first time in a second learning task, Le., after S was familiar with the task (Simon & Jackson, 1967).…”