Ganglion Cell Response Characteristics from the Area Centralis in the Intact Eye of the Cat

Ganglion Cell Response Characteristics from the Area Centralis in the Intact Eye of the Cat

Author: Roy Herbert Steinberg

Publisher:

Published: 1968

Total Pages: 52

ISBN-13:

DOWNLOAD EBOOK

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).


Book Synopsis Ganglion Cell Response Characteristics from the Area Centralis in the Intact Eye of the Cat by : Roy Herbert Steinberg

Download or read book Ganglion Cell Response Characteristics from the Area Centralis in the Intact Eye of the Cat written by Roy Herbert Steinberg and published by . This book was released on 1968 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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).

An Analysis of the D.c. Component of the Local Electroretinogram in the Intact Eye of the Cat

An Analysis of the D.c. Component of the Local Electroretinogram in the Intact Eye of the Cat

Author: Roy Herbert Steinberg

Publisher:

Published: 1967

Total Pages: 52

ISBN-13:

DOWNLOAD EBOOK

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).


Book Synopsis An Analysis of the D.c. Component of the Local Electroretinogram in the Intact Eye of the Cat by : Roy Herbert Steinberg

Download or read book An Analysis of the D.c. Component of the Local Electroretinogram in the Intact Eye of the Cat written by Roy Herbert Steinberg and published by . This book was released on 1967 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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).

Reports

Reports

Author: Naval School of Aviation Medicine (U.S.)

Publisher:

Published: 1967

Total Pages: 278

ISBN-13:

DOWNLOAD EBOOK


Book Synopsis Reports by : Naval School of Aviation Medicine (U.S.)

Download or read book Reports written by Naval School of Aviation Medicine (U.S.) and published by . This book was released on 1967 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Cumulated Index Medicus

Cumulated Index Medicus

Author:

Publisher:

Published: 1988

Total Pages: 1332

ISBN-13:

DOWNLOAD EBOOK


Book Synopsis Cumulated Index Medicus by :

Download or read book Cumulated Index Medicus written by and published by . This book was released on 1988 with total page 1332 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Principles of Sensory Physiology

Principles of Sensory Physiology

Author: Henry Tamar

Publisher: Charles C. Thomas Publisher

Published: 1972

Total Pages: 416

ISBN-13:

DOWNLOAD EBOOK


Book Synopsis Principles of Sensory Physiology by : Henry Tamar

Download or read book Principles of Sensory Physiology written by Henry Tamar and published by Charles C. Thomas Publisher. This book was released on 1972 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Bibliography of Scientific and Industrial Reports

Bibliography of Scientific and Industrial Reports

Author:

Publisher:

Published: 1968

Total Pages: 1012

ISBN-13:

DOWNLOAD EBOOK


Book Synopsis Bibliography of Scientific and Industrial Reports by :

Download or read book Bibliography of Scientific and Industrial Reports written by and published by . This book was released on 1968 with total page 1012 pages. Available in PDF, EPUB and Kindle. Book excerpt:

U.S. Government Research and Development Reports Index

U.S. Government Research and Development Reports Index

Author:

Publisher:

Published: 1968

Total Pages: 486

ISBN-13:

DOWNLOAD EBOOK


Book Synopsis U.S. Government Research and Development Reports Index by :

Download or read book U.S. Government Research and Development Reports Index written by and published by . This book was released on 1968 with total page 486 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Xth I.S.C.E.R.G. Symposium

Xth I.S.C.E.R.G. Symposium

Author: J.T. Pearlman

Publisher: Springer Science & Business Media

Published: 2012-12-06

Total Pages: 401

ISBN-13: 9401026971

DOWNLOAD EBOOK

Two groups of volunteers having no eye disease were examined electro-oculo graphically twice at ten minute intervals. One group smoked in the break, one didn't. In the non-smoking group there are a number of significant correlations between the tested parameters in the dark-period and in the light-period, which could not be found to the same degree in the smoking group. The fact that there were differences between the two groups-even though not interpretable systematicaIly-suggests, that smoking influences physiological processes in the EOG. In the second period of the test, a parallelism in the course of EOG and EEG was observed, the EEG-changes, however, are interpreted more psychologically than pharmacologicaIly. REFERENCES HAASE, E. & MUELLER, W. Meßbare Beeinflussung des EOG durch Zigarettenrauchen1 Klin. Mbl. Augenhk. Bd. 158:677 (1971). HAGER, H. Thrombangiitis obliterans und Auge. Klin. Mbl. Augenhk. Bd. 114:238 (1949). HAUSER, H., SCHWARZE, B.E., ROTH, G. & BICKFORD, R.G. Electroencephalographic changes related to smoking. EEG clin. Neurophysiol. Vol. 10:576P (1958). HEIMBÖCK. Wien. klin. Wschr. Bd. 73:529 (1961). HOLLWICH, F., JÜNEMANN, G. & DAMASKE, E. Auge. In: Nikotin. Edited by Schievelbein. H. Georg Thieme Verlag, Stuttgart (1968). HOMER, L.D. & KOLDER, H. Mathematical model of oscillations in human corneo-retinal potential. Pflügers Arch. ges. Physiol. 287 :197 (1966). KOLDER H. Spontane und experimentelle Änderungen des Bestandpotentials des menschlichen Auges. P{lügerrs Arch. ges. Physiol. 268:258 (1959). KOLDER, H.E. & HOCHGESAND, P. Empirical Model of Electro-Oculogram. Doc. Ophtha!. (1972) in press.


Book Synopsis Xth I.S.C.E.R.G. Symposium by : J.T. Pearlman

Download or read book Xth I.S.C.E.R.G. Symposium written by J.T. Pearlman and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 401 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two groups of volunteers having no eye disease were examined electro-oculo graphically twice at ten minute intervals. One group smoked in the break, one didn't. In the non-smoking group there are a number of significant correlations between the tested parameters in the dark-period and in the light-period, which could not be found to the same degree in the smoking group. The fact that there were differences between the two groups-even though not interpretable systematicaIly-suggests, that smoking influences physiological processes in the EOG. In the second period of the test, a parallelism in the course of EOG and EEG was observed, the EEG-changes, however, are interpreted more psychologically than pharmacologicaIly. REFERENCES HAASE, E. & MUELLER, W. Meßbare Beeinflussung des EOG durch Zigarettenrauchen1 Klin. Mbl. Augenhk. Bd. 158:677 (1971). HAGER, H. Thrombangiitis obliterans und Auge. Klin. Mbl. Augenhk. Bd. 114:238 (1949). HAUSER, H., SCHWARZE, B.E., ROTH, G. & BICKFORD, R.G. Electroencephalographic changes related to smoking. EEG clin. Neurophysiol. Vol. 10:576P (1958). HEIMBÖCK. Wien. klin. Wschr. Bd. 73:529 (1961). HOLLWICH, F., JÜNEMANN, G. & DAMASKE, E. Auge. In: Nikotin. Edited by Schievelbein. H. Georg Thieme Verlag, Stuttgart (1968). HOMER, L.D. & KOLDER, H. Mathematical model of oscillations in human corneo-retinal potential. Pflügers Arch. ges. Physiol. 287 :197 (1966). KOLDER H. Spontane und experimentelle Änderungen des Bestandpotentials des menschlichen Auges. P{lügerrs Arch. ges. Physiol. 268:258 (1959). KOLDER, H.E. & HOCHGESAND, P. Empirical Model of Electro-Oculogram. Doc. Ophtha!. (1972) in press.

The Retinal Müller Cell

The Retinal Müller Cell

Author: Vijay Sarthy

Publisher: Springer Science & Business Media

Published: 2005-12-08

Total Pages: 290

ISBN-13: 0306468417

DOWNLOAD EBOOK

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.


Book Synopsis The Retinal Müller Cell by : Vijay Sarthy

Download or read book The Retinal Müller Cell written by Vijay Sarthy and published by Springer Science & Business Media. This book was released on 2005-12-08 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Government Reports Announcements

Government Reports Announcements

Author:

Publisher:

Published: 1968

Total Pages: 1250

ISBN-13:

DOWNLOAD EBOOK


Book Synopsis Government Reports Announcements by :

Download or read book Government Reports Announcements written by and published by . This book was released on 1968 with total page 1250 pages. Available in PDF, EPUB and Kindle. Book excerpt: