Ganglion Cell Response Characteristics From The Area Centralis In The Intact Eye Of The Cat PDF Download
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Author | : Roy Herbert Steinberg |
Publisher | : |
Total Pages | : 52 |
Release | : 1968 |
Genre | : Retinal ganglion cells |
ISBN | : |
Download Ganglion Cell Response Characteristics from the Area Centralis in the Intact Eye of the Cat Book in PDF, ePub and Kindle
Ganglion cell responses were recorded with microelectrodes from the intact eye to focused spots and annuli of light delivered by a dual-beam ophthalmoscope. Only concentrically organized circular receptive fields were analysed. Thresholds for optimal center and surround stimuli were approximately equal, as were the latencies of on-responses from the center and surround. With whole-field stimulation center-dominance was a function of light intensity. Off-responses and center-surround interaction were observed with brief flashes (5 msec, 10 msec). With increases of flash duration the duration of the on-response did not increase by the full increment of the flash until the flashes were 50 to 80 msec. At high-flash intensities the on-response extended into the off-period and the off-response weakened and disappeared; it occurred with both on-excitation and on-inhibition and for the responses of both center and surround. These intensity effects were also studied in an intracellular recording; at high intensities, the rate of repolarization of the postsynaptic potential decreased, and the latency of repolarization was delayed. (Author).
Author | : Roy H. Steinberg |
Publisher | : |
Total Pages | : 45 |
Release | : 1968 |
Genre | : |
ISBN | : |
Download Ganglion Cell Response Characteristics from the Area Centralis in the Intact Eye of the Cat Book in PDF, ePub and Kindle
Ganglion cell responses were recorded with microelectrodes from the intact eye to focused spots and annuli of light delivered by a dual-beam ophthalmoscope. Only concentrically organized circular receptive fields were analysed. Thresholds for optimal center and surround stimuli were approximately equal, as were the latencies of on-responses from the center and surround. With whole-field stimulation center-dominance was a function of light intensity. Off-responses and center-surround interaction were observed with brief flashes (5 msec, 10 msec). With increases of flash duration the duration of the on-response did not increase by the full increment of the flash until the flashes were 50 to 80 msec. At high-flash intensities the on-response extended into the off-period and the off-response weakened and disappeared; it occurred with both on-excitation and on-inhibition and for the responses of both center and surround. These intensity effects were also studied in an intracellular recording; at high intensities, the rate of repolarization of the postsynaptic potential decreased, and the latency of repolarization was delayed. (Author).
Author | : Lawrence Henry Pinto |
Publisher | : |
Total Pages | : 264 |
Release | : 1970 |
Genre | : Cats |
ISBN | : |
Download The Response of the Cat Retinal Ganglion Cell Book in PDF, ePub and Kindle
Author | : Roy Herbert Steinberg |
Publisher | : |
Total Pages | : 52 |
Release | : 1967 |
Genre | : Electroretinography |
ISBN | : |
Download An Analysis of the D.c. Component of the Local Electroretinogram in the Intact Eye of the Cat Book in PDF, ePub and Kindle
The local electroretinogram (LERG) was recorded with microelectrodes from the intact eye in response to focused spots and annuli delivered by a dual-beam ophthalmoscope. The d.c. component was readily isolated from the b-wave on the basis of a lower threshold, smaller summation area, and greater resistance to light adaptation, thereby supporting a hypothesis that separates these components. At high flash intensities the d.c. component increased in duration as its decay was delayed; a slowing in decay rate also occurred and an earlier off-response was revealed. These effects were influenced by flash duration and the level of light adaptation. The late receptor potential was also recorded from the area centralis after clamping the retinal circulation at the optic disk. At moderate levels of light adaptation it was isolated from the c-wave and exhibited a rapid decay-phase. The behavior of the late RP in response to increases in flash intensity and duration paralled the behavior of the d.c. component. (Author).
Author | : |
Publisher | : |
Total Pages | : 1332 |
Release | : 1988 |
Genre | : Medicine |
ISBN | : |
Download Cumulated Index Medicus Book in PDF, ePub and Kindle
Author | : |
Publisher | : |
Total Pages | : 1250 |
Release | : 1968 |
Genre | : Research |
ISBN | : |
Download Government Reports Announcements Book in PDF, ePub and Kindle
Author | : Naval School of Aviation Medicine (U.S.) |
Publisher | : |
Total Pages | : 278 |
Release | : 1967 |
Genre | : |
ISBN | : |
Download Reports Book in PDF, ePub and Kindle
Author | : Vijay Sarthy |
Publisher | : Springer Science & Business Media |
Total Pages | : 290 |
Release | : 2005-12-08 |
Genre | : Medical |
ISBN | : 0306468417 |
Download The Retinal Müller Cell Book in PDF, ePub and Kindle
The human brain contains more than a billion neurons which interconnect to form networks that process, store, and recall sensory information. These neuronal activities are supported by a group of accessory brain cells coll- tively known as neuroglia. Surprisingly, glial cells are ten times more - merous than neurons, and occupy more than half the brain volume (Hydén, 1961). Although long considered a passive, albeit necessary, component of the nervous system, many interesting and unusual functional properties of glial cells are only now being brought to light. As a result, the status of these cellular elements is approaching parity with nerve cells as a subject for experimental study. The term glia (or glue) seems today to be a misnomer in view of the diverse functions attributed to glial cells. Experimental studies in the last three decades have clearly established that the behavior of glial cells is far from passive, and that they are at least as complex as neurons with regard to their membrane properties. In addition, glial cells are of importance in signal processing, cellular metabolism, nervous system development, and the pathophysiology of neurological diseases. The Müller cell of the ver- brate retina provides a splendid example of an accessory cell that exhibits features illustrating every aspect of the complex behavior now associated with glial cells.
Author | : Elisabeth Ann Tobin |
Publisher | : |
Total Pages | : |
Release | : 1976 |
Genre | : Optic nerve |
ISBN | : |
Download Temporal Frequency Characteristics of the Center Response Mechanism of X- and Y-retinal Ganglion Cells of the Cat Book in PDF, ePub and Kindle
Author | : |
Publisher | : |
Total Pages | : 1000 |
Release | : 1968 |
Genre | : Nuclear science abstracts |
ISBN | : |
Download U.S. Government Research and Development Reports Index Book in PDF, ePub and Kindle