Accuracy demands, environmental structure and viewing conditions in interception tasks

30 subjects performed an interception task in which the accuracy demands were varied under binocular vs monocular viewing conditions and under different conditions of environmental structure. The pattern of results suggests that the advantage of binocular viewing is due to the concordance of information detected by both eyes rather than to binocular vision per se. The presence of static environmental structure enhances performance because it provides a stable external basis against which optical changes can be evaluated.