Naceri A, Moscatelli A, Chellali R. Depth discrimination of constant angular size stimuli in action space: role of accommodation and convergence cues. Frontiers in Human Neuroscience . 2015;9: 511. ; In our daily life experience, the angular size of an object correlates with its distance from the observer, provided that the physical size of the object remains constant. In this work, we investigated depth perception in action space (i.e., beyond the arm reach), while keeping the angular size of the target object constant. This was achieved by increasing the physical size of the target object as its distance to the observer increased. To the best of our knowledge, this is the first time that a similar protocol has been tested in action space, for distances to the observer ranging from 1.4–2.4 m. We replicated the task in virtual and real environments and we found that the performance was significantly different between the two environments. In the real environment, all participants perceived the depth of the target object precisely. Whereas, in virtual reality (VR) the responses were significantly less precise, although, still above chance level in 16 of the 20 observers. The difference in the discriminability of the stimuli was likely due to different contributions of the convergence and the accommodation cues in the two environments. The values of Weber fractions estimated in our study were compared to those reported in previous studies in peripersonal and action space.


    Access

    Download


    Export, share and cite



    Title :

    Depth discrimination of constant angular size stimuli in action space: role of accommodation and convergence cues ; Depth discrimination in action space


    Contributors:

    Publication date :

    2015-01-01


    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English


    Keywords :

    Classification :

    DDC:    570 / 629




    Speed change discrimination for motion in depth using constant world and retinal speeds

    Lee, Abigail R. I. / Ales, Justin M. / Harris, Julie M. | BASE | 2019

    Free access

    Stereoscopic depth perception in video see-through augmented reality within action space

    Kyto, M. / Makinen, A. / Tossavainen, T. et al. | British Library Online Contents | 2014


    Depth Cues From Optical Flow

    Shih, Frank Y. / Prathuri, Chandra | SPIE | 1990


    Phase space vehicle stability discrimination method

    WANG CHUNYAN / WU ZIHAN / ZHANG ZIYU et al. | European Patent Office | 2020

    Free access

    Space Object Identification, Discrimination, and Tracking

    Simon, Kameron | British Library Conference Proceedings | 2021