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The experimental equipment with its key elements highlighted. The visual target was displayed on the LCD screen and presented via a beamsplitter to the subject. The screen and beamsplitter were mounted on a motorized track that could be moved in real space to change the near-visual demand. The screen and beamsplitter ramped towards and away from the subject in Experiment I, moved sinusoidally in Experiment II and remained stationary at 80 cm in Experiment III.
