Download PDF by Jonathan Stone: Parallel Processing in the Visual System: The Classification

By Jonathan Stone

ISBN-10: 1468444336

ISBN-13: 9781468444339

ISBN-10: 1468444352

ISBN-13: 9781468444353

In the mid-sixties, John Robson and Christina Enroth-Cugell, with no knowing what they have been doing, trigger a digital revolution within the examine of the visible process. They have been attempting to practice the tools of linear platforms research (which have been already getting used to explain the optics of the attention and the psychophysical functionality of the human visible procedure) to the houses of retinal ganglion cells within the cat. Their notion was once to stimulate the retina with styles of stripes and to examine the best way that the signs from the heart and the adversarial encompass of the respective box of every ganglion cellphone (first defined through Stephen Kuffier) engage to generate the cell's responses. a number of the ganglion cells behaved themselves very well and John and Christina obtained into the behavior (they now say) of calling them I (interesting) cells. despite the fact that. to their annoyance, the vast majority of neurons they recorded had nasty, nonlinear houses that could not be anticipated at the foundation of easy summ4tion of sunshine in the heart and the encompass. those uncoop­ erative ganglion cells, which Enroth-Cugell and Robson in the beginning referred to as D (dull) cells, produced brief bursts of impulses whenever the distribution of sunshine falling at the receptive box used to be replaced, no matter if the full mild flux was once unaltered.

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Extra resources for Parallel Processing in the Visual System: The Classification of Retinal Ganglion Cells and its Impact on the Neurobiology of Vision

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Visual coding by an array of ganglion cells (from Rodieck and Stone, 1965b). The original legend reads: "Response of an off-center unit to different chordal movements of a 1° black disk. The disk moved through 20° (10° each side of the receptive field of the unit) with a velocity of 10° /sec. The responses to different paths are shown in perspective view. For simplicity of illustration the histograms are shown as smooth lines obtained by tracings from the plotted histograms. The arrow points to the histogram obtained after we had set the disk to move horizontally through the center of the receptive field.

A: OFF and ON of the general illumination; no response. B: Burst of activity in response to a small dark moving object (1 degree in diameter). C: Upper trace, sustained response to the same object stopped in the RRF. Lower trace, the sustained response was elicited by the small object stopped in the RRF but was erased by a transient darkening of the general visual field. D: Invariance of the response to movement under changes of illumination. The small object was moved slowly through the RRF shortly after the level of illumination was set.

But also all areas which show a functional connection, by an inhibitory or excitatory effect on a ganglion cell. This may well involve areas which are somewhat remote from a ganglion cell and by themselves do not set up discharges. By either definition, areas of the retina that give rise to McIlwain's periphery effect would be included in a receptive field, so that Y-class ganglion cells could be regarded as having receptive fields of very large size [up to 40 0 radius (McIlwain, 1966)]. " is Hartline's original comment that the extent of a receptive field depends on the stimulus used to plot it.

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Parallel Processing in the Visual System: The Classification of Retinal Ganglion Cells and its Impact on the Neurobiology of Vision by Jonathan Stone

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