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. Author manuscript; available in PMC: 2009 Jun 8.
Published in final edited form as: Psychophysiology. 2007 May;44(3):403–406. doi: 10.1111/j.1469-8986.2007.00519.x

Figure 1.

Figure 1

A: Two symbols (“+” and “ × ”) used for target detection and fear conditioning. During fear conditioning, CSs were masked (top) and unmasked (bottom), with opponent-color stimuli or same-color stimuli presented to each eye, respectively. In the former case, masking produces a percept of uniform yellow. B: Schematic of stimulus presentation, with a stimulus pair being flashed five times (ON for 50 ms, OFF for 150 ms). During fear conditioning, the shock was delivered at the final termination of the unmasked CS+.