Abstract
The inhibition that is exerted mutually among receptor units (ommatidia) of the compound eye of Limulus is less for units widely separated than for those close together. This diminution of inhibition with distance is the resultant of two factors: (1) the threshold of inhibitory action increases with increasing distance between the units involved; and (2) the coefficient of inhibitory action decreases with increasing distance. The discharge of nerve impulses from ommatidia at various distances from one another may be described quantitatively by a set of simultaneous linear equations which express the excitatory effects of the illumination on each ommatidium and the inhibitory interactions between each ommatidium and its neighbors. The values of the thresholds and coefficients of inhibitory action, which appear as parameters in these equations, must be determined empirically: their dependence on distance is somewhat irregular and cannot yet be expressed in an exact general law. Nevertheless the diminution of inhibitory influences with distance is sufficiently uniform that patterns of neural response generated by various patterns of illumination on the receptor mosaic can be predicted qualitatively. Such predictions have been verified experimentally for two simple patterns of illumination: an abrupt step in intensity, and a simple gradient between two levels of intensity (the so-called Mach pattern). In each case, transitions in the pattern of illumination are accentuated in the corresponding pattern of neural response.
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Selected References
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- BARLOW H. B., FITZHUGH R., KUFFLER S. W. Change of organization in the receptive fields of the cat's retina during dark adaptation. J Physiol. 1957 Aug 6;137(3):338–354. doi: 10.1113/jphysiol.1957.sp005817. [DOI] [PMC free article] [PubMed] [Google Scholar]
- HARTLINE H. K., RATLIFF F. Inhibitory interaction of receptor units in the eye of Limulus. J Gen Physiol. 1957 Jan 20;40(3):357–376. doi: 10.1085/jgp.40.3.357. [DOI] [PMC free article] [PubMed] [Google Scholar]
- HARTLINE H. K., RATLIFF F. Spatial summation of inhibitory influences in the eye of Limulus, and the mutual interaction of receptor units. J Gen Physiol. 1958 May 20;41(5):1049–1066. doi: 10.1085/jgp.41.5.1049. [DOI] [PMC free article] [PubMed] [Google Scholar]
- HARTLINE H. K., WAGNER H. G., RATLIFF F. Inhibition in the eye of Limulus. J Gen Physiol. 1956 May 20;39(5):651–673. doi: 10.1085/jgp.39.5.651. [DOI] [PMC free article] [PubMed] [Google Scholar]
- MILLER W. H. Morphology of the ommatidia of the compound eye of Limulus. J Biophys Biochem Cytol. 1957 May 25;3(3):421–428. doi: 10.1083/jcb.3.3.421. [DOI] [PMC free article] [PubMed] [Google Scholar]
- RATLIFF F., MILLER W. H., HARTLINE H. K. Neural interaction in the eye and the integration of receptor activity. Ann N Y Acad Sci. 1959 Nov 12;74(2):210–222. doi: 10.1111/j.1749-6632.1958.tb39546.x. [DOI] [PubMed] [Google Scholar]