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1.

001-es BibID:BIBFORM033348
Első szerző:Beaulieu, Clermont
Cím:Quantitative distribution of GABA-immunopositive and -immunonegative neurons and synapses in the monkey striate cortex (area 17) / C. Beaulieu, Z. Kisvarday, P. Somogyi, M. Cynader, A. Cowey
Dátum:1992
ISSN:1047-3211
Megjegyzések:The number of GABA-immunoreactive [GABA(+)] neurons and synapses was determined in functionally distinct subregions delineated as rich and poor in cytochrome oxidase (CO) in the visual cortex of adult macaque monkeys. The average numerical density (number per unit volume, Nv) of GABA(+) neurons and synapses was not significantly different between the CO-rich and -poor regions. Twenty percent of the total number of cortical neurons and 17% of the synapses were GABA(+). On average, each visual cortical neuron receives 3900 synapses, 660 of them being GABA(+). The latter were distributed on the target cell in a pattern that predicts the site of GABA influences in cortex. The major targets of GABA(+) synapses were dendritic shafts, comprising nearly two-thirds of the postsynaptic elements. About every fourth and every eighth GABA(+) synapse was devoted to dendritic spines and to neuronal somata, respectively. Axon initial segments, although the exclusive targets of GABA(+) cells, comprise less than 0.1% of structures postsynaptic to GABA(+) boutons. From this distribution, we estimate that in each cubic millimeter of striate cortex there were about 20 million GABA(+) synapses on dendritic spines, 47 million on dendritic trunks, 9 million on somata, and fewer than 0.1 million on axon initial segments. The sites of influences of GABA-immunonegative [GABA(-)] synapses were different in that they target mainly dendritic spines and dendritic trunks. About two-thirds of GABA(-) synapses were on dendritic spines, and the remainder were devoted to dendritic trunks. Only a minute fraction innervate somata. We estimate that in 1 mm3 of striate cortex there were about 235 million GABA(-) synapses on spines, 133 million on dendrites, and about 2 million on somata. The proportions of GABA(+) neurons and synapses and their target distribution did not appreciably differ from those of the visual cortex of the cat even though the numerical density of neurons was 2.5 times higher in the monkey.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
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Megjelenés:Cerebral Cortex. - 2 : 4 (1992), p. 295-309. -
További szerzők:Kisvárday Zoltán (1957-) (biológus, neurobiológus) Somogyi Péter Cynader, M. Cowey, Alan
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Intézményi repozitóriumban (DEA) tárolt változat
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2.

001-es BibID:BIBFORM017883
Első szerző:Karube, Fuyuki
Cím:Axon Topography of Layer IV Spiny Cells to Orientation Map in the Cat Primary Visual Cortex (Area 18) / Karube, F., Kisvarday, Z. F.
Dátum:2011
ISSN:1047-3211
Megjegyzések:Our aim was to reveal the relationship between layer IV horizontal connections and the functional architecture of the cat primary visual cortex because these connections play important roles in the first cortical stage of visual signals integration. We investigated bouton distribution of spiny neurons over an orientation preference map using in vivo optical imaging, unit recordings, and single neuron reconstructions. The radial extent of reconstructed axons (14 star pyramidal and 9 spiny stellate cells) was -1.5 mm. In the vicinity of the parent somata (<400 m), boutons occupied chiefly iso-orientations, however, more distally, 7 cells projected preferentially to non-iso-orientations. Boutons of each cell were partitioned into 1-15 distinct clusters based on the mean-shift algorithm, of which 57 clusters preferred iso-orientations and 43 clusters preferred cross-orientations, each showing sharp orientation preference "tuning." However, unlike layer III/V pyramidal cells preferring chiefly iso-orientations, layer IV cells were engaged with broad orientations because each bouton cluster from the same cell could show different orientation preference. These results indicate that the circuitry of layer IV spiny cells is organized differently from that of iso-orientation dominant layer III/V cells and probably processes visual signals in a different manner from that of the superficial and deeper layers.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
egyetemen (Magyarországon) készült közlemény
Egészség- és Környezettudomány
Megjelenés:Cerebral Cortex. - 21 : 6 (2011), p. 1443-1458. -
További szerzők:Kisvárday Zoltán (1957-) (biológus, neurobiológus)
Pályázati támogatás:TÁMOP-4.2.1/B-09/1/KONV-2010-0007
TÁMOP
A gerincvelő felületes hátsó szarvi neuronhálózatok szerveződése és plaszticitása krónikus gyulladásos és neuropátiás fájdalom állapotokban
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Intézményi repozitóriumban (DEA) tárolt változat
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3.

001-es BibID:BIBFORM033345
Első szerző:Kisvárday Zoltán (biológus, neurobiológus)
Cím:Calculating direction maps from intrinsic signals revealed by optical imaging / Zoltán F. Kisvárday, Péter Buzás, Ulf T. Eysel
Dátum:2001
ISSN:1047-3211
Megjegyzések:Previous optical imaging studies used the vector-summation (VS) method for calculating direction and orientation preference maps. However, for direction maps it often resulted in direction vectors which showed a steep angle to that of orientation vectors violating the 'aperture rule'. The present report provides a simple procedure for calculating direction preference maps using the 'electro- physiologist's ear' approach. This approach takes into account the strongest directional response component (vector-maximum, VM) in each pixel of the optical image, reminiscent of how electro- physiologists determine direction preference by audio-monitoring of the firing rate of neurons. The major advantage of this method is that the orthogonal relationship between orientation and direction preference vectors is preserved and that for most image pixels direction preference can be faithfully described by a single vector parameter. Here we used the VM method for calculating direction and the VS method for calculating orientation preference maps and quantified their spatial relationship. The results showed that, typically, an iso-orientation domain contained a pair of patches that preferred opposite directions orthogonal to the orientation. Rate-of-change maps for direction revealed that virtually all direction discontinuity lines linked orientation centres. Close to orientation centres, direction discontinuity lines ran chiefly parallel with iso-orientation lines, whereas more remotely they had either parallel or perpendicular courses.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
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Megjelenés:Cerebral Cortex. - 11 : 7 (2001), p. 636-647. -
További szerzők:Buzás Péter Eysel, Ulf T.
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Intézményi repozitóriumban (DEA) tárolt változat
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4.

001-es BibID:BIBFORM033346
Első szerző:Kisvárday Zoltán (biológus, neurobiológus)
Cím:Orientation-specific relationship between populations of excitatory and inhibitory lateral connections in the visual cortex of the cat / Zoltán F. Kisvárday, Éva Tóth, Martin Rausch, Ulf T. Eysel
Dátum:1997
ISSN:1047-3211
Megjegyzések:The topography of lateral excitatory and lateral inhibitory connections was studied in relation to orientation maps obtained in areas 17 and 18. Small iontophoretic injections of biocytin were delivered to the superficial layers in regions where orientation selectivity had been mapped using electrode recordings of single- and multi-unit activity from various cortical depths. Biocytin revealed extensive patchy axonal projections of up to 3.5 mm in both areas while labelled somata occurred chiefly at the injection site, indicating that the labelling was primarily anterograde. Two types of boutons could be clearly distinguished: (i) putative excitatory boutons either en passant or having a short stalk and (ii) inhibitory boutons which were invariably of the basket-type. Three-dimensional reconstructions of all labelled boutons showed that the excitatory and the inhibitory networks had a distinctively different relationship to orientation maps. The overall distribution of connections showed that 53-59% of excitatory and 46-48% of inhibitory connections were at iso-orientation, +/-30 degrees; oblique-orientation, +/-(30-60) degrees, was shown by 30% of excitatory and 28-39% of inhibitory connections; cross-orientation was shown by 11-17% of excitatory and 15-24% of inhibitory connections. Although excitatory patches occupied mainly iso-orientation locations, interpatch regions representing chiefly non-iso-orientations (oblique + cross orientation) were also innervated. There was considerable overlap between the excitatory and inhibitory network. Nonetheless, inhibitory connections were more common than excitatory connections with non-iso-orientation locations. There was no significant difference between the orientation topography of area 17 and area 18 projections. The results suggest that in general the lateral connectivity system is not orientation specific, but shows a moderate iso-orientation preference for excitation and an even weaker iso-orientation preference for inhibition. The broad orientation spectrum of lateral connections could provide the basis for mechanisms that requiring different orientations, as for example in detecting orientation discontinuities.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
külföldön készült közlemény
Megjelenés:Cerebral Cortex. - 7 : 7 (1997), p. 605-618. -
További szerzők:Tóth Éva Rausch, Martin Eysel, Ulf T.
Internet cím:Intézményi repozitóriumban (DEA) tárolt változat
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5.

001-es BibID:BIBFORM009542
Első szerző:Rochefort, N. L.
Cím:Functional selectivity of interhemispheric connections in cat visual cortex / N. L. Rochefort, P. Buzás, N. Quenech'du, A. Koza, U. T. Eysel, C. Milleret, Z. F. Kisvárday
Dátum:2009
ISSN:1047-3211 (Print)
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:Cerebral Cortex. - 19 : 10 (2009), p. 2451-2465. -
További szerzők:Buzás Péter Quenech'du, N. Koza A. Eysel, Ulf T. Milleret, C. Kisvárday Zoltán (1957-) (biológus, neurobiológus)
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6.

001-es BibID:BIBFORM004125
Első szerző:Stepanyants, Armen
Cím:Local potential connectivity in cat primary visual cortex / Armen Stepanyants, Judith A. Hirsch, Luis M. Martinez, Zoltán F. Kisvárday, Alex S. Ferecskó, Dmitri B. Chklovskii
Dátum:2008
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:Cerebral Cortex. - 18 : 1 (2008), p. 13-28. -
További szerzők:Hirsch, Judith A. Martinez, Luis M. Kisvárday Zoltán (1957-) (biológus, neurobiológus) Ferecskó, Alex S. Chklovskii, Dmitri B.
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