Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
. 1980;37(2):77-92.
doi: 10.1007/BF00364247.

Spatial characteristics of movement detection mechanisms in human vision. I. Achromatic vision

Spatial characteristics of movement detection mechanisms in human vision. I. Achromatic vision

J L Barbur et al. Biol Cybern. 1980.

Abstract

Threshold illumination levels, It, for visual detection of white light targets, moving across spatially structured background fields, have been measured and it is shown that, for a given background illumination level, It depends upon the spatial characteristics of the background field structure. Thus, with the background composed of a square-waveform grating of fundamental spatial frequency f cycles/deg, It is maximum for an intermediate value of f, and falls as f increases or decreases from this value. The relationship between It and f characterizes the interaction between movement detection and the background grating, and is designated the IMG function. The parametric properties of the IMG functions are described and it is established that the mechanisms which give rise to these functions are sensitive to the movement, but not the spatial structure of the target. They correspond, therefore, to the movement-sensitive Y-type mechanisms, observed in electrophysiological studies of cat and primate visual pathways. The spatial distribution of sensitivity associated with the IMG functions has been computed by 2-D transform methods, the computation yielding circularly symmetric, centre-surround antagonistic "receptive field" distributions.

PubMed Disclaimer

Similar articles

Cited by

References

    1. Vision Res. 1971 Mar;11(3):261-73 - PubMed
    1. J Neurophysiol. 1971 Sep;34(5):920-36 - PubMed
    1. Nature. 1976 Apr 15;260(5552):604-6 - PubMed
    1. Vision Res. 1971 Jan;11(1):57-81 - PubMed
    1. J Physiol. 1968 Mar;195(1):215-43 - PubMed

LinkOut - more resources