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Contextual cueing in 3D layouts defined by binocular disparity

Under incidental learning conditions, a spatial layout can be acquired implicitly and facilitates visual search (the contextual cueing effect; Chun & Jiang, 1998). We investigated two aspects of this effect: Whether spatial layouts of a 3D display are encoded automatically or require selective processing (Experiment 1), and whether the learned layouts are limited to 2D configurations or can encompass three dimensions (Experiment 2). In Experiment 1, participants searched for a target presented only in a specific depth plane. Contextual cueing effect was obtained only when the location of the items in the attended plane was invariant and consistently paired with a target location. In contrast, repeating and pairing the layout of the ignored items with the target location did not produce a contextual cueing effect. In Experiment 2, we found that reaction times for the repeated condition increased significantly when the disparity of the repeated distractors was reversed in the last block of trials. These results indicate that contextual cueing in 3D displays occurs when the layout is relevant and selectively attended, and that 3D layouts can be preserved as an implicit visual spatial context.