Perceptual switching or the reversal of ambiguous figures, is an extensively studied phenomenon in visual perception. Eye-movement studies have investigated the relation between switching behavior and fixation duration, the interval between saccades. Ellis & Stark [1] compared the average length of the interval in which a switch is reported to that of the surrounding intervals. They found that fixation durations are longer for intervals that contain a switch than for surrounding intervals. These observations, however, are highly susceptible to a sampling error called the 'bus paradox'. [1] did not report any bias control. A replication of their experiment is presented in which bias control was applied to the fixation durations. The result shows an effect opposite to [1]; fixations in which a switch is reported are shorter than surrounding fixations.
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