Hatsopoulos, Nicholas G. and Gabbiani, Fabrizio and Laurent, Gilles (1995) Elementary computation of object approach by wide-field visual neuron. Science, 270 (5238). pp. 1000-1003. ISSN 0036-8075. http://resolver.caltech.edu/CaltechAUTHORS:20130816-103145499
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An essential function of the brain is to detect threats, such as those posed by objects or predators on a collision course. A wide-field, movement-sensitive visual neuron in the brain of the locust was studied by presenting simulated approaching, receding, and translating objects. The neuron's responses could be described simply by multiplying the velocity of the image edge (dθ/dt) with an exponential function of the size of the object's image on the retina (e−αθ). Because this product peaks before the image reaches its maximum size during approach, this neuron can anticipate collision. The neuron's activity peaks approximately when the approaching object reaches a certain angular size. Because this neuron receives distinct inputs about image size and velocity, the dendritic tree of a single neuron may function as a biophysical device that can carry out a multiplication of two independent input signals.
|Additional Information:||30 June 1995 ; accepted 6 September 1995. We gratefully acknowledge C. Koch (NSF Center for Neuromorphic Systems Engineering) for use of the Hewlett-Packard workstation and D. van Essen for use of the photocell. We thank A. Braun for computer assistance and E. Schuman, C. Koch, and an anonymous referee for comments on the manuscript. Supported by NSF grant IBN-9412426 (F.G.) and an Office of Naval Research grant and NSF-Presidential Faculty Fellowship Award to G.L.|
|Group:||Koch Laboratory, KLAB|
|Official Citation:||Elementary Computation of Object Approach by a Wide-Field Visual Neuron Nicholas Hatsopoulos, Fabrizio Gabbiani and Gilles Laurent Science , New Series, Vol. 270, No. 5238 (Nov. 10, 1995), pp. 1000-1003|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||KLAB Import|
|Deposited On:||11 Mar 2010 06:07|
|Last Modified:||20 Nov 2015 18:44|
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