Stereoscopic depth, Disparity, Attention, Binocular vision
Cognition and Perception | Other Neuroscience and Neurobiology | Vision Science
Stereoscopic depth is most useful when it comes from relative rather than absolute disparities. However, the depth perceived from relative disparities can vary with stimulus parameters that have no connection with depth or are irrelevant to the task. We investigated observers’ ability to judge the stereo depth of task-relevant stimuli while ignoring irrelevant stimuli. The calculation of depth from disparity differs for 1-D and 2-D stimuli and we were interested in the role stimulus dimensionality plays in observers’ ability to select relevant information. We show here that the presence of irrelevant disparities affects perceived depth differently depending on stimulus dimensionality. Observers could not ignore disparities of irrelevant stimuli when they judged the relative depth between a 1-D stimulus (a grating) and a 2-D stimulus (a plaid). However, irrelevant disparities had scarcely any effect on judgments of the relative depth between 2-D stimuli. Two processes contributing to stereo depth were identified, only one of which uses a horizontal disparity metric and permits attentional selection.
Farell, Bart and Ng, Cherlyn J., "Attentional Selection In Judgments Of Stereo Depth" (2017). Biomedical and Chemical Engineering. 50.