Spatial vision research during the 1970s was dominated by the spatial frequency channel paradigm of Campbell and Robson (1968). This article summarizes some research and current views on spatial frequency channels. By channels, we mean an array of medium bandwidth mechanisms, similar to the simple cells that are commonly found in the visual system. The viewpoint presented here provides a useful...

cause natural flush of the urethra; fourthly, climatic effect retards the progress of the disease. In India, particularly in Bengal, the statistical data are incomplete and therefore misleading. On the strength of the. so-called available statistics, no scientific inference about the percentage of stricture urethra cases can be correctly ascertained, which, in my opinion, should neither be exag...

My colleagues could have conferred no greater honour on me than to ask me to deliver this year's Campbell Memorial Oration. Little did I think when, as a first-year hospital student, I was allocated to Robert Campbell as surgical dresser, that I should be standing here tonight as Campbell orator. My only wish is that I could have been more worthy to follow in the footsteps of those distinguishe...

is published in full as a supplement to this number of the Journal. At the conclusion of the Oration, Dr. John Rankin proposed a vote of thanks to Dr. Campbell. He said previous orators had all known Robert Campbell, but this was the first time one who had not enjoyed his friendship had made his contribution. Robert Campbell was a scholar, and it was that happy blend of the scholarly and the sc...

the term paradigm has become a central issue in philosophy of science. increasing attention to paradigm in public administration, as a branch of social science, is also highlighted. this paper attempts to analysis seven paradigms in public administration research and to study ontological, epistemological, methodological, rhetorical and axiological assumptions of the each paradigm. finally, we b...