In natural viewing, numerous depth cues are available to the visual system, but their significance varies considerably depending on the viewing distance. How is it reflected in the outcome of depth judgements? We have designed a psychophysical experiment with a limited number of depth cues to examine distance-related changes in the correct response rate and time. Twenty young adults evaluated relative depth of stimuli in physical space. Each time four constant angular size achromatic stimuli were presented on a volumetric multi-planar display. One of these stimuli was demonstrated closer to the observer comparing to others. The experiment followed the four-interval forced-choice procedure. On any given trial, observers determined which one of four stimuli was located closest to them. The nine viewing distances ranged from 0.5 m to 2.5 m. Overall, the depth judgements were correct and fast at the close viewing distances. However, the correct response rate dropped markedly at 1.0 m distance and continued declining gradually at larger distances. The average response time experienced the linear growth with increasing distance. In total, we showed that the relative depth judgements based on binocular depth cues changed the most at the viewing distances that exceeded 1.0 m, as well as the response time and correctness were affected to varying degrees.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.