HOW MANY LIGHT ADAPTATION MECHANISMS ARE THERE - AUTHORS RESPONSE

The generally positive response to our target article indicates that m ost of the commentators accept our contention that light adaptation co nsists of multiple and possibly redundant mechanisms. The commentaries fall into three general categories. The first deals with putative mec hanisms that we chose not to emphasize. The second is a more extended discussion of the role of calcium in adaptation. Finally, additional a spects of cGMP involvement in adaptation are considered. We discuss ea ch of these points in turn.