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. Author manuscript; available in PMC: 2013 Nov 25.
Published in final edited form as: Cereb Cortex. 2004 Nov 10;15(7):10.1093/cercor/bhh201. doi: 10.1093/cercor/bhh201

Figure 1.

Figure 1

Experimental design. An alternating block design was used (30 s blocks alternating between SRT task and visual fixation). Subjects viewed a four-position array on a screen and, as a position became highlighted, pressed the appropriate button on a keypad. Two types of sequence were presented, each with or without instruction to try to discover the repeating sequence. Each sequence lasted consisted of 10 successive position, changing at one position per second. There were thus three presentations of a sequence within a 30 s block.