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    On the effective number of tracked trajectories in normal human vision.

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    Publication date
    2007
    Author
    Tripathy, Srimant P.
    Narasimhan, Sathyasri
    Barrett, Brendan T.
    Keyword
    Tracked trajectories
    Human vision
    Threshold paradigm
    Suprathreshold stimuli
    Peer-Reviewed
    Yes
    
    Metadata
    Show full item record
    Abstract
    Z. W. Pylyshyn and R. W. Storm (1988) have shown that human observers can accurately track four to five items at a time. However, when a threshold paradigm is used, observers are unable to track more than a single trajectory accurately (S. P. Tripathy & B. T. Barrett, 2004). This difference between the two studies is examined systematically using substantially suprathreshold stimuli. The stimuli consisted of one (Experiment 1) or more (Experiments 2 and 3) bilinear target trajectories embedded among several linear distractor trajectories. The target trajectories deviated clockwise (CW) or counterclockwise (CCW) (by 19°, 38°, or 76° in Experiments 1 and 2 and by 19°, 38°, or 57° in Experiment 3), and observers reported the direction of deviation. From the percentage of correct responses, the ¿effective¿ number of tracked trajectories was estimated for each experimental condition. The total number of trajectories in the stimulus and the number of deviating trajectories had only a small effect on the effective number of tracked trajectories; the effective number tracked was primarily influenced by the angle of deviation of the targets and ranged from four to five trajectories for a ±76° deviation to only one to two trajectories for a ±19° deviation, regardless of whether the different magnitudes of deviation were blocked (Experiment 2) or interleaved (Experiment 3). Simple hypotheses based on ¿averaging of orientations,¿ ¿preallocation of resources,¿ or pop-out, crowding, or masking of the target trajectories are unlikely to explain the relationship between the effective number tracked and the angle of deviation of the target trajectories. This study reconciles the difference between the studies cited above in terms of the number of trajectories that can be tracked at a time.
    URI
    http://hdl.handle.net/10454/4009
    Version
    No full-text available in the repository
    Citation
    Tripathy, S.R., Narasimhan, S. and Barrett, B.T. (2007). On the effective number of tracked trajectories in normal human vision. Journal of Vision. Vol. 7, No. 6, pp. 1-18.
    Link to publisher’s version
    http://dx.doi.org/10.1167/7.6.2
    Type
    Article
    Collections
    Life Sciences Publications

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