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This is a remarkable time to study the vertebrate retina, either as a model for the brain or to understand the first steps in vison. We have known about the diversity of retinal neurons and glia for more than one hundred years, and we are now extending these findings and making new discoveries about retinal cell types by analyzing gene expression in single cells. We have made significant progress toward our ultimate goals of describing the neural circuits in the retinas at the level of connections between identified populations of neurons and understanding neuronal and glial cell function at the molecular level. We have also made great strides toward understanding retinal development and the...
Photons are sensed by retinal photoreceptors whose matrix-like distribution underlies the transformation of illumination patterns of the visual scene into photoreceptor activity patterns in a visuotopic fashion. Activity of neighboring photoreceptors then are compared by secondary bipolar cells to decipher information regarding luminosity- and color-contrast. Bipolar cells achieve this by comparing signals received directly from their center receptive field with those come from spatially offset surrounding receptive field areas mediated by inhibitory, sign-inverting horizontal cells. This information is ultimately sent to retinal ganglion cells, the output neurons of the retina. In addition ...
In August 2000 a Festschrift was held at the Marine Biological Laboratory, Woods Hole, Massachusetts to celebrate the career of Professor John E. Dowling on the occasion of his 65th birthday. Containing contributions from more than 50 of John's colleagues, representing a Who's Who of the vision research community, this work not only provides a memento of the occasion, but will hopefully serve as a basic reference for future researchers in retinal biology. The volume is divided somewhat arbitrarily into seven areas of retinal research containing chapters that present in some cases a broad overview of a particular topic, and in others an account of current research and studies in progress. These chapters exemplify the richness, diversity, and excitement of contemporary retinal research. They also remind us of how much more needs to be done before we understand fully the interrelationship between retinal neurons, the complex interactions between neurons and glial cells, and the mechanisms that govern retinal development. A final chapter contributed by John Dowling provides an overview of past accomplishments, and offers some future perspectives on retinal research in the 21st century.
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