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Titolo:
Calculating direction maps from intrinsic signals revealed by optical imaging
Autore:
Kisvarday, ZF; Buzas, P; Eysel, UT;
Indirizzi:
Ruhr Univ Bochum, Inst Physiol, Abt Neurophysiol, D-44801 Bochum, Germany Ruhr Univ Bochum Bochum Germany D-44801 physiol, D-44801 Bochum, Germany
Titolo Testata:
CEREBRAL CORTEX
fascicolo: 7, volume: 11, anno: 2001,
pagine: 636 - 647
SICI:
1047-3211(200107)11:7<636:CDMFIS>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
CAT VISUAL-CORTEX; ISO-ORIENTATION DOMAINS; STRIATE CORTEX; FUNCTIONAL ARCHITECTURE; CORTICAL-CELLS; COMPLEX CELLS; ORGANIZATION; SELECTIVITY; CONNECTIONS; AREA-18;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
33
Recensione:
Indirizzi per estratti:
Indirizzo: Kisvarday, ZF Ruhr Univ Bochum, Inst Physiol, Abt Neurophysiol, Univ Str 150, D-44801 Bochum, Germany Ruhr Univ Bochum Univ Str 150 Bochum Germany D-44801 ermany
Citazione:
Z.F. Kisvarday et al., "Calculating direction maps from intrinsic signals revealed by optical imaging", CEREB CORT, 11(7), 2001, pp. 636-647

Abstract

Previous optical imaging studies used the vector-summation (VS) method forcalculating 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 mapsusing the 'electrophysiologist's ear' approach. This approach takes into account the strongest directional response component (vector-maximum, VM) ineach pixel of the optical image, reminiscent of how electrophysiologists 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 he faithfully described bya 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 directionrevealed that virtually all direction discontinuity lines linked orientation centres. Close to orientation centres, direction discontinuity lines ranchiefly parallel with iso-orientation lines, whereas more remotely they had either parallel or perpendicular courses.

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Documento generato il 23/01/20 alle ore 06:20:51