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. Author manuscript; available in PMC: 2013 Nov 25.
Published in final edited form as: Cereb Cortex. 2003 Feb;13(2):144–154. doi: 10.1093/cercor/13.2.144

Figure 1.

Figure 1

Schematic of object-location learning trials at two levels of difficulty, two-item learning (top) and four-item learning (bottom). In each trial, an array of easily discriminable shapes is presented for 1500 ms around a central crosshair, followed by 500 ms of fixation on a central crosshair, followed by central presentation of one of the shapes as a test stimulus for 2000 ms. Subjects moved a joystick to indicate the position of the test stimulus in the original array and received immediate visual feedback concerning the correctness of their decisions. The same array of shapes was repeatedly presented in four 24 s epochs at each level of difficulty.