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  • 1
    Electronic Resource
    Electronic Resource
    Wide-field, motion-sensitive neurons and matched filters for optic flow fields (2000)
    Springer
    Biological cybernetics 83 (2000), S. 185-197 
    Details
    ISSN: 1432-0770
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Computer Science , Physics
    Notes: Abstract.  The receptive field organization of a class of visual interneurons in the fly brain (vertical system, or VS neurons) shows a striking similarity to certain self-motion-induced optic flow fields. The present study compares the measured motion sensitivities of the VS neurons (Krapp et al. 1998) to a matched filter model for optic flow fields generated by rotation or translation. The model minimizes the variance of the filter output caused by noise and distance variability between different scenes. To that end, prior knowledge about distance and self-motion statistics is incorporated in the form of a “world model”. We show that a special case of the matched filter model is able to predict the local motion sensitivities observed in some VS neurons. This suggests that their receptive field organization enables the VS neurons to maintain a consistent output when the same type of self-motion occurs in different situations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004220000163
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Multiplicative computation in a visual neuron sensitive to looming (2002)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 420 (2002), S. 320-324 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Multiplicative operations are important in sensory processing, but their biophysical implementation remains largely unknown. We investigated an identified neuron (the lobula giant movement detector, LGMD, of locusts) whose output firing rate in response to looming visual stimuli has been ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature01190
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Estimation of self-motion by optic flow processing in single visual interneurons (1996)
    [s.l.] : Nature Publishing Group
    Nature 384 (1996), S. 463-466 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] For several decades, coherent retinal image-shifts induced during locomotion have been considered a rich source of information about the momentary self-motion7. These retinal image-shifts, known as optic flow fields, can be described as vector fields where each vector indicates the direction and ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/384463a0
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    Paper (German National Licenses)
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