Studied interhemispheric depth comparisons by requiring Ss to align in depth 2 textured plates, one presented to the left hemifield and the other to the right. Three callosal agenesis (CLA) Ss and 9 normal control Ss adjusted the plates so that they appeared to be at the same distance. Ss viewed the plates monocularly or binocularly while keeping their head still, moving it side-to-side or moving it up and down. Ss fixated a target located between the 2 plates while performing the task. For all Ss, the deviations from veridical settings were significantly smaller for the binocular than for the monocular viewing conditions. Precision of interhemispheric comparison for binocular depth is apparently not affected by corpus callosum absence. In the monocular condition, control Ss judged the relative depth between the plates more precisely when they moved their head than when they kept it still. This was not true for the CLA Ss. (PsycINFO Database Record (c) 2007 APA, all rights reserved)

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