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001-es BibID:	BIBFORM020539
Első szerző:	Eckhorn, Reinhard
Cím:	Visual resolution with retinal implants estimated from recordings in cat visual cortex / Reinhard Eckhorn, Marcus Wilms, Thomas Schanze, Marcus Eger, Lutz Hesse, Ulf T. Eysel, Zoltán F. Kisvárday, Eberhart Zrenner, Florian Gekeler, Helmut Schwahn, Keisuke Shinoda, Helmut Sachs, Peter Walter
Dátum:	2006
ISSN:	0042-6989
Megjegyzések:	We investigated cortical responses to electrical stimulation of the retina using epi- and sub-retinal electrodes of 20-100 microm diameter. Temporal and spatial resolutions were assessed by recordings from the visual cortex with arrays of microelectrodes and optical imaging. The estimated resolutions were approximately 40 ms and approximately 1 degrees of visual angle. This temporal resolution of 25 frames per second and spatial resolution of about 0.8 cm at about 1m and correspondingly 8 cm at 10 m distance seems sufficient for useful object recognition and visuo-motor behavior in many in- and out-door situations of daily life.
Tárgyszavak:	Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban külföldön készült közlemény
Megjelenés:	Vision Research. - 46 : 17 (2006), p. 2675-2690. -
További szerzők:	Wilms, Marcus Schanze, Thomas Eger, Marcus Hesse, Lutz Eysel, Ulf T. Kisvárday Zoltán (1957-) (biológus, neurobiológus) Zrenner, Eberhart Gekeler, Florian Schwahn, Helmut Shinoda, Keisuke Sachs, Helmut Walter, Peter
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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001-es BibID:	BIBFORM033340
Első szerző:	Walter, Peter
Cím:	Cortical activation via an implanted wireless retinal prosthesis / Peter Walter, Zoltán F. Kisvárday, Michael Görtz, Nils Alteheld, Gernot Rossler, Thomas Stieglitz, Ulf T. Eysel
Dátum:	2005
ISSN:	0146-0404
Megjegyzések:	PURPOSE: To demonstrate local cortical activations in the primary visual cortex of the cat as a result of retinal electrical stimulation by means of a completely wireless-controlled, implantable retinal prosthesis in a series of acute experiments. METHODS: The transfer of energy to drive the device and signals to activate any combination of 25 retinal electrodes was achieved completely wirelessly by an external transmitter positioned in front of the eye. Individually configured electrical stimuli were applied via any combination of 25 electrodes, on sending the necessary pulse parameters to the implant. Placement of the implant onto the retinal surface was achieved after lensectomy and vitrectomy in the cat. Fixation was performed with a retinal tack. Cortical activation patterns were recorded by means of optical imaging of intrinsic signals. RESULTS: Implantation and fixation were successfully performed in three cats. Wireless activation of the implant by radiofrequency was demonstrated by recording of stimulus artifacts from the sclera. Local activation of the visual cortex measured by optical imaging of intrinsic signals revealed a shift of cortical response that was well correlated with a change in the position of the activated retinal electrodes. CONCLUSIONS: The results demonstrate the retinotopic activation of the visual cortex using a completely wireless, remote-controlled retinal implant.
Tárgyszavak:	Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban külföldön készült közlemény
Megjelenés:	Investigative Ophthalmology & Visual Science. - 46 : 5 (2005), p. 1780-1785. -
További szerzők:	Kisvárday Zoltán (1957-) (biológus, neurobiológus) Görtz, Michael Alteheld, Nils Rossler, Gernot Stieglitz, Thomas Eysel, Ulf T.
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