In a comparison between stereo and vernier thresholds in displacement and misalignment paradigms, the stereo displacement threshold was found to be about three times higher than the other thresholds. This result is consistent with the disparity inhibition hypothesis. In a second experiment thresholds in a movement/no movement discrimination task were about half those in the direction discrimination task, with the stereo threshold remaining about three times higher than the vernier threshold. This suggests that motion discrimination has a different basis from direction discrimination.
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