Document Type





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.



To view the content in your browser, please download Adobe Reader or, alternately,
you may Download the file to your hard drive.

NOTE: The latest versions of Adobe Reader do not support viewing PDF files within Firefox on Mac OS and if you are using a modern (Intel) Mac, there is no official plugin for viewing PDF files within the browser window.