AI Article Synopsis
- Research on retinal ganglion cells (RGCs) in rabbits and mice shows that their responses to motion direction develop independently of light exposure.
- Early postnatal direction-selective ganglion cells (DSGCs) exhibit lower excitability and slower response times compared to adult DSGCs, but their ability to detect motion direction remains similar.
- The study suggests that the circuitry for coding motion direction in the retina forms regardless of light conditions, as even DSGCs raised in complete darkness demonstrate clear direction selectivity.
Article Abstract
Selective responses of retinal ganglion cells (RGCs) to the direction of motion have been recorded extracellularly from the rabbit and the mouse retina at eye opening. Recently, it has been shown that the development of this circuitry is light independent. Using whole-cell patch clamp recording, we report here that mouse early postnatal direction-selective ganglion cells (DSGCs) showed lower membrane excitability, lower reliability of synaptic transmission and much slower kinetics of light responses compared with adult DSGCs. However, the degree of direction selectivity of early postnatal DSGCs measured by the direction-selective index and the width of the directional tuning curve was almost identical to that of adult DSGCs. The DSGCs exhibited a clear selectivity for the direction of motion at the onset of light sensitivity. Furthermore, the degree of direction selectivity was not affected by rearing in complete darkness from birth to postnatal day 11 or 30. The formation of the retinal neurocircuitry for coding motion direction is completely independent of light.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2669973 | PMC |
| http://dx.doi.org/10.1113/jphysiol.2008.161240 | DOI Listing |
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