PMID: 3320282Nov 1, 1987Paper

Retinal W-cell input to the upper superficial gray layer of the cat's superior colliculus: a conduction-velocity analysis

Journal of Neurophysiology
D M Berson

Abstract

1. I have used several methods to estimate the conduction velocities of retinal afferents innervating the upper 50-100 micron of the stratum griseum superficiale (the upper SGS). The measurements were based on a unitary extracellular potential unique to this sublamina, which was first described by McIlwain (28). He termed it the juxtazonal potential (JZP), and showed that it results when a single spike invades the terminal arbor of a single retinal afferent to the upper SGS, triggering synchronous excitatory postsynaptic potentials in postsynaptic collicular cells. 2. Individual unitary JZPs were evoked at fixed latencies by weak shocks to the optic disk, chiasm, or tract. When the same JZP could be evoked in isolation from two stimulus sites, the conduction velocity of the axon triggering the JZP was estimated by dividing the conduction time between the stimulating electrodes (i.e., the "latency difference") into the distance separating these electrodes. This "latency-difference method" lacked general utility, however, since the same JZP could only rarely be evoked in isolation from two stimulus sites. 3. This limitation was circumvented by means of a collision method. When a stimulus that evoked a JZP in isolation was precede...Continue Reading

Citations

Aug 29, 1998·The Journal of Comparative Neurology·D M BersonE V Famiglietti
Jun 19, 2014·Journal of Neural Engineering·James W FransenMaureen A McCall
Jan 1, 1995·Visual Neuroscience·M H Rowe, L A Palmer
Oct 1, 1989·The Journal of Comparative Neurology·D M Dacey

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