Failure of continuous light to inhibit compression of retinotectal projection in goldfish

Meyer, Ronald L.; Scott, Margaret Y.

doi:10.1016/0006-8993(77)90243-8

Cited by 8 publications

(3 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Gaze & Sharma (1970) were the first to describe reorganization of the retinotectal projection following removal of the caudal tectum in goldfish which proves that, whatever mechanisms normally guide specific fibres to appropriate termination sites, these are not based on any unique invariant selective affinity. One of their observations, that the full retinotopic projection is reconstituted in a 'compressed' fashion on the remaining tectal fragment, has been confirmed in many similar studies (Yoon, 1971(Yoon, , 1972a(Yoon, , b, 1975(Yoon, , 1976Meyer & Scott, 1977; Marotte, Wye-Dvorak & Mark, 1977;Cook, 1979; Wye-Dvorak, Marotte & Mark, 1979). However they also reported that in cases where the optic nerve was not undergoing regeneration a subpopulation of fibres which would normally terminate in the caudal tectum came to form a 'duplicate' ordered projection superimposed on the normal projection to the remaining rostal tectum.…”

Section: Introductionmentioning

confidence: 74%

“…group either duplicate projections, or partially compressed, partially duplicated projections, were found. Thus, ifthe numerous studies which have failed to find duplication (Yoon, 1971(Yoon, , 1972a(Yoon, , b, 1975(Yoon, , 1976Meyer & Scott, 1977;Marotte et al 1977;Cook, 1979;Wye-Dvorak et al 1979) had involved removal of less than half the caudal tectum, then duplicate responses are not to have been expected, even when the nerve was intact. Alternatively the possibility exists that in some cases of non-compression the occurrence of duplicate responses may have been overlooked, or, under certain conditions Glastonbury & Straznicky, 1978), duplicate projections may have been unrecordable.…”

Section: Mechanisms Underlying Compression and Duplicationmentioning

confidence: 99%

“…We had to take into account a number of other extraneous factors which have been shown recently to affect the occurrence of compression and might therefore also have accounted for discrepancies in the appearance of duplication. Thus we compared fish kept in constant and diurnal lighting conditions since it has been reported that continuous illumination can prevent compression and other manifestations of plasticity (Yoon, 1975;Beazley & Humphrey, 1980;Marotte et al 1981) although others have failed to replicate the effect (Arora & Grinnell, 1976;Marotte et al 1977;Meyer, 1977;Meyer & Scott, 1977;Scott, 1977). Furthermore, Wye-Dvorak et al (1979) have shown that compression (or duplication of fields) seldom occurs in fish operated in autumn although there are occasionally exceptions among large and small fish kept in constant light (Marotte et al 1981).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Some determinants of optic terminal localization and retinotopic polarity within fibre populations in the tectum of goldfish.

Horder¹,

Martin²

1982

The Journal of Physiology

View full text Add to dashboard Cite

SUMMARY1. The reorganization of the retinotectal projection which results after partial ablation of tectal tissue was examined in goldfish using electrophysiological methods.2. Regardless of the size of a unilateral ablation of caudal tectum, an orderly and virtually complete, 'compressed', visual projection re-formed on the remaining tectum after crushing the optic nerve and allowing it to regenerate.3. If the optic nerve was left intact after ablations of caudal tectum, compressed projections were only found when the ablations were small. Large caudal ablations involving half or more of the dorsal tectum resulted in the cut fibres transposing onto the remaining tectum and forming an overlaid, 'duplicate', projection on the remaining intact projection.4. In approximately one third of cases the duplicate projection lay in a reversed polarity along the rostrocaudal axis of the tectum. In the remaining cases the polarity of the duplicate projection was normal.5. Transposed projections of reversed rostrocaudal polarity could be consistently obtained by ablating temporal retina and caudal tectum, leaving an intact strip of fibres terminals along the caudal edge of the tectal remnant.6. Compression and duplication occurred in the same way if fish were maintained in constant light.7. After ablations of lateral tectum, leaving the optic nerve intact, compression and some disorderly duplications were found.8. Reversed projections could be induced across the mediolateral axis of dorsal tectum by denervating the medial tectum and ablating a strip of lateral tectum.9. Projections of normal polarity were found after the optic nerve was allowed to regenerate into tecta which had previously supported reversed polarity projections.

show abstract

Section: Introductionmentioning

confidence: 74%

Section: Mechanisms Underlying Compression and Duplicationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Some determinants of optic terminal localization and retinotopic polarity within fibre populations in the tectum of goldfish.

Horder¹,

Martin²

1982

The Journal of Physiology

View full text Add to dashboard Cite

show abstract

Pattern of development of ascending and descending fibers in embryonic spinal cord of chick: I. Role of position information

Nornes

Hart

Carry

1980

J of Comparative Neurology

View full text Add to dashboard Cite

Previous studies on the rigid time and position pattern of embryonic spinal cord development are extended to include the pattern of growth of axonal processes. This study was designed to analyze the position of axons in the marginal zone as they course (fasciculate) in the ascending and descending direction from a single spinal segment. Injections of 3H-proline were made into L1 or T6 of chick embryos of stages 21--29 (3.5--6 days of incubation). The location of radioactive label in the marginal zone was analyzed autoradiographically to show the location of labeled axons originating from the injected segment. In the early stages of development (stage 21), the labeled descending axons were located in the most ventromedial aspect of the marginal zone. The labeled ascending axons were located more laterally and to the perimeter of this zone. In stages 27--29, the labeled axons near the site of injection were located in the inner two-thirds of the marginal zone, and in the progressively more rostral levels the label shifted laterally and to the perimeter in a laminar pattern. It was concluded that the labeled ascending axons from an individual spinal segment layer upon the axons which originate from the more rostral segments. How this rigid time and position pattern of axonal growth can impart a topographic order into fiber tracts of the spinal cord was discussed.

show abstract

The effects of eliminating impulse activity on the development of the retinotectal projection in salamanders

Harris

1980

J of Comparative Neurology

124

View full text Add to dashboard Cite

The California newt Taricha torosa manufactures tetrodotoxin, a blocker of voltage-sensitive sodium channels and therefore of action potentials.The newt's own nervous system is insensitive to this toxin. Grafting an embryonic eye to the newt from a tetrodotoxin-sensitive species, the Mexican axolotl, blocks action potentials in the retinal ganglion cells of the transplanted eye. Neuroanatomical and electrophysical techniques demonstrate that while such ganglion cells are incapable of firing impulses, they develop normally, grow axons to the host tectum, terminate in the appropriate neuropil layers, form synapses, and project to the tectum retinotopically. Furthermore, they develop these apparently normal projections even in competition with electrically active axons from a host eye.

show abstract

Failure of continuous light to inhibit compression of retinotectal projection in goldfish

Cited by 8 publications

References 6 publications

Some determinants of optic terminal localization and retinotopic polarity within fibre populations in the tectum of goldfish.

Some determinants of optic terminal localization and retinotopic polarity within fibre populations in the tectum of goldfish.

Pattern of development of ascending and descending fibers in embryonic spinal cord of chick: I. Role of position information

The effects of eliminating impulse activity on the development of the retinotectal projection in salamanders

Contact Info

Product

Resources

About