Subjects made trend and difference estimates in an experiment with three display types: two-dimensional (2D), three-dimensional with monocular cues (3D mono), and three-dimensional with monocular cues and stereopsis (3D stereo). The results showed a general accuracy advantage for 2D displays, even for global trend estimates. Binocular stereopsis appeared to provide a slight advantage in accuracy for trend estimation. The data are partially consistent with the predictions of the Proximity Compatibility Principle. Possible mental operations used with the various displays are discussed.
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