Multiple distance cues do not prevent systematic biases in reach to grasp movements

Karl K. Kopiske, Chiara Bozzacchi, Robert Volcic, Fulvio Domini

    Research output: Contribution to journalArticle

    Abstract

    The perceived distance of objects is biased depending on the distance from the observer at which objects are presented, such that the egocentric distance tends to be overestimated for closer objects, but underestimated for objects further away. This leads to the perceived depth of an object (i.e., the perceived distance from the front to the back of the object) also being biased, decreasing with object distance. Several studies have found the same pattern of biases in grasping tasks. However, in most of those studies, object distance and depth were solely specified by ocular vergence and binocular disparities. Here we asked whether grasping objects viewed from above would eliminate distance-dependent depth biases, since this vantage point introduces additional information about the object’s distance, given by the vertical gaze angle, and its depth, given by contour information. Participants grasped objects presented at different distances (1) at eye-height and (2) 130 mm below eye-height, along their depth axes. In both cases, grip aperture was systematically biased by the object distance along most of the trajectory. The same bias was found whether the objects were seen in isolation or above a ground plane to provide additional depth cues. In two additional experiments, we verified that a consistent bias occurs in a perceptual task. These findings suggest that grasping actions are not immune to biases typically found in perceptual tasks, even when additional cues are available. However, online visual control can counteract these biases when direct vision of both digits and final contact points is available.

    Original languageEnglish (US)
    JournalPsychological Research
    DOIs
    StateAccepted/In press - Jan 1 2018

    Fingerprint

    Vision Disparity
    Cues
    Hand Strength

    ASJC Scopus subject areas

    • Experimental and Cognitive Psychology
    • Developmental and Educational Psychology
    • Arts and Humanities (miscellaneous)

    Cite this

    Multiple distance cues do not prevent systematic biases in reach to grasp movements. / Kopiske, Karl K.; Bozzacchi, Chiara; Volcic, Robert; Domini, Fulvio.

    In: Psychological Research, 01.01.2018.

    Research output: Contribution to journalArticle

    Kopiske, Karl K. ; Bozzacchi, Chiara ; Volcic, Robert ; Domini, Fulvio. / Multiple distance cues do not prevent systematic biases in reach to grasp movements. In: Psychological Research. 2018.
    @article{67148686fe724b43b2e3c56526ef8d87,
    title = "Multiple distance cues do not prevent systematic biases in reach to grasp movements",
    abstract = "The perceived distance of objects is biased depending on the distance from the observer at which objects are presented, such that the egocentric distance tends to be overestimated for closer objects, but underestimated for objects further away. This leads to the perceived depth of an object (i.e., the perceived distance from the front to the back of the object) also being biased, decreasing with object distance. Several studies have found the same pattern of biases in grasping tasks. However, in most of those studies, object distance and depth were solely specified by ocular vergence and binocular disparities. Here we asked whether grasping objects viewed from above would eliminate distance-dependent depth biases, since this vantage point introduces additional information about the object’s distance, given by the vertical gaze angle, and its depth, given by contour information. Participants grasped objects presented at different distances (1) at eye-height and (2) 130 mm below eye-height, along their depth axes. In both cases, grip aperture was systematically biased by the object distance along most of the trajectory. The same bias was found whether the objects were seen in isolation or above a ground plane to provide additional depth cues. In two additional experiments, we verified that a consistent bias occurs in a perceptual task. These findings suggest that grasping actions are not immune to biases typically found in perceptual tasks, even when additional cues are available. However, online visual control can counteract these biases when direct vision of both digits and final contact points is available.",
    author = "Kopiske, {Karl K.} and Chiara Bozzacchi and Robert Volcic and Fulvio Domini",
    year = "2018",
    month = "1",
    day = "1",
    doi = "10.1007/s00426-018-1101-9",
    language = "English (US)",
    journal = "Psychological Research",
    issn = "0340-0727",
    publisher = "Springer Verlag",

    }

    TY - JOUR

    T1 - Multiple distance cues do not prevent systematic biases in reach to grasp movements

    AU - Kopiske, Karl K.

    AU - Bozzacchi, Chiara

    AU - Volcic, Robert

    AU - Domini, Fulvio

    PY - 2018/1/1

    Y1 - 2018/1/1

    N2 - The perceived distance of objects is biased depending on the distance from the observer at which objects are presented, such that the egocentric distance tends to be overestimated for closer objects, but underestimated for objects further away. This leads to the perceived depth of an object (i.e., the perceived distance from the front to the back of the object) also being biased, decreasing with object distance. Several studies have found the same pattern of biases in grasping tasks. However, in most of those studies, object distance and depth were solely specified by ocular vergence and binocular disparities. Here we asked whether grasping objects viewed from above would eliminate distance-dependent depth biases, since this vantage point introduces additional information about the object’s distance, given by the vertical gaze angle, and its depth, given by contour information. Participants grasped objects presented at different distances (1) at eye-height and (2) 130 mm below eye-height, along their depth axes. In both cases, grip aperture was systematically biased by the object distance along most of the trajectory. The same bias was found whether the objects were seen in isolation or above a ground plane to provide additional depth cues. In two additional experiments, we verified that a consistent bias occurs in a perceptual task. These findings suggest that grasping actions are not immune to biases typically found in perceptual tasks, even when additional cues are available. However, online visual control can counteract these biases when direct vision of both digits and final contact points is available.

    AB - The perceived distance of objects is biased depending on the distance from the observer at which objects are presented, such that the egocentric distance tends to be overestimated for closer objects, but underestimated for objects further away. This leads to the perceived depth of an object (i.e., the perceived distance from the front to the back of the object) also being biased, decreasing with object distance. Several studies have found the same pattern of biases in grasping tasks. However, in most of those studies, object distance and depth were solely specified by ocular vergence and binocular disparities. Here we asked whether grasping objects viewed from above would eliminate distance-dependent depth biases, since this vantage point introduces additional information about the object’s distance, given by the vertical gaze angle, and its depth, given by contour information. Participants grasped objects presented at different distances (1) at eye-height and (2) 130 mm below eye-height, along their depth axes. In both cases, grip aperture was systematically biased by the object distance along most of the trajectory. The same bias was found whether the objects were seen in isolation or above a ground plane to provide additional depth cues. In two additional experiments, we verified that a consistent bias occurs in a perceptual task. These findings suggest that grasping actions are not immune to biases typically found in perceptual tasks, even when additional cues are available. However, online visual control can counteract these biases when direct vision of both digits and final contact points is available.

    UR - http://www.scopus.com/inward/record.url?scp=85053915967&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=85053915967&partnerID=8YFLogxK

    U2 - 10.1007/s00426-018-1101-9

    DO - 10.1007/s00426-018-1101-9

    M3 - Article

    JO - Psychological Research

    JF - Psychological Research

    SN - 0340-0727

    ER -