期刊
IEEE TRANSACTIONS ON NEURAL SYSTEMS AND REHABILITATION ENGINEERING
卷 29, 期 -, 页码 2445-2455出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TNSRE.2021.3128878
关键词
Retina; Rabbits; Mice; Visualization; Correlation; Bars; Prosthetics; Artificial vision; retinal implant; retinal prosthesis; electrical stimulation; direction-selective RGC
资金
- Korea Institute of Science and Technology (KIST) [2E31251]
- National Research Foundation of Korea (NRF) - Ministry of Science and ICT [2020R1C1C1006065, 2021M3F3A2A01037366]
- VA Boston Healthcare System
- National Eye Institute [R01EY023651]
- National Institute of Neurological Disorders and Stroke [R01NS110575]
- National Research Foundation of Korea [2021M3F3A2A01037366, 2020R1C1C1006065] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The study characterized the electrically-evoked network-mediated responses of ON-OFF direction-selective (DS) RGCs in rabbit and mouse retinas for the first time. Different species showed strong negative correlations between spike counts of electric responses and direction selective indices, with some distinct differences between DS cells. Proper animal model selection is crucial in prosthetic researches as species-dependent retinal circuits may result in different electric response features.
To restore the sight of individuals blinded by outer retinal degeneration, numerous retinal prostheses have been developed. However, the performance of those implants is still hampered by some factors including the lack of comprehensive understanding of the electrically-evoked responses arising in various retinal ganglion cell (RGC) types. In this study, we characterized the electrically-evoked network-mediated responses (hereafter referred to as electric responses) of ON-OFF direction-selective (DS) RGCs in rabbit and mouse retinas for the first time. Interestingly, both species in common demonstrated strong negative correlations between spike counts of electric responses and direction selective indices (DSIs), suggesting electric stimulation activates inhibitory presynaptic neurons that suppress null direction responses for high direction tuning in their light responses. The DS cells of the two species showed several differences including different numbers of bursts. Also, spiking patterns were more heterogeneous across DS RGCs of rabbits than those of mice. The electric response magnitudes of rabbit DS cells showed positive and negative correlations with ON and OFF light response magnitudes to preferred direction motion, respectively. But the mouse DS cells showed positive correlations in both comparisons. Our Fano Factor (FF) and spike time tiling coefficient (STTC) analyses revealed that spiking consistencies across repeats were reduced in late electric responses in both species. Moreover, the response consistencies of DS RGCs were lower than those of non-DS RGCs. Our results indicate the species-dependent retinal circuits may result in different electric response features and therefore suggest a proper animal model may be crucial in prosthetic researches.
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