What is the concept of blindness to a blind person?
Q. I've been wondering about this for some time. I am quite aware that those who are blind see nothing at all, and those who are born blind don't even understand the concept of sight most of the time. However, if someone were to somehow lose their eyes or eyesight (accident, illness, etc.), what would their missing sense of sight detect? Would they "see" just pure black darkness, similar to when people close their eyes? Or would they simply just not be able to identify that sense, such as two people trying to telepathically communicate with each other? Or is there another answer altogether?
Asked by PEG - Fri Aug 28 20:29:26 2009 - - 2 Answers - 0 Comments

A. Interesting question. I think that people that have had vision, and then lose visual apparatus outside of the brain, will "see black". However, there is a different form of blindness called cortical blindness. This is when the part of the brain that receives the visual signal is damaged. Not only can these people not see, but they are unaware they cannot see ie they don't panic and shout "Hey I've gone blind! Help!". They stare out like they are trying to see; they will look towards people talking to them. It is only when you ask them directly if they can see something, they will say "I don't know".
Answered by how's this? - Sat Aug 29 03:40:13 2009

What is the concept of 'threshold' in geomorphological perspective?
Q. What is the concept of 'threshold' in geomorphological perspective? Why is it important? What examples are there?
Asked by y8lll - Thu Jun 12 04:20:58 2008 - - 1 Answers - 0 Comments

A. A geomorphological threshold is a point at which a landform becomes unstable. An intrinsic threshold indicates that changes are possible independently within the system; for example, a surging glacier, while an extrinsic threshold indicates change brought about by change in an external factor; for example, the formation of gullies with the progressive removal of the vegetation cover. However, the changes which initiate discontinuities may be different from those needed to maintain or reverse them; glacial surging again providing an example. The Holocene climate change is a good example. These threshold are important because they indicate a change-either natural or man made-that could have a negative effect on our environment. That signals… [cont.]
Answered by Curiosity - Thu Jun 12 06:30:23 2008

What economist is attributed with the concept of pump priming?
Q. Who came up with the concept and what famous economists' views run contrary to this theory?
Asked by Dick T - Thu Jan 24 20:53:11 2008 - - 1 Answers - 0 Comments

A. The concept of "pump priming" is associated with the theories of John Maynard Keynes. A lot of people have criticized this concept, but the most famous and important is probably Milton Friedman.
Answered by dowcet - Thu Jan 24 22:16:27 2008