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Two choices good, four choices better: For measuring stereoacuity in children, a four-alternative forced-choice paradigm is more efficient than two

Fig 8

Experiment duration for different trial numbers, for the 2-AFC task (red solid line) and the 4-AFC task (blue dotted line).

Fig 8

doi: https://doi.org/10.1371/journal.pone.0201366.g008