Lecture 10: February 8th2013Multi dimensional scaling solution for a series of tests: Fluid intelligenceThis is a multi dimensional scaling found from a factor analysisyou take a whole bunch of numbers you put them into a correlation calculator and it pumps out many different types of correlations… in the center group those are more or less correlated with each other and they are more correlated with what is near the box…this summarizes in the general sense of what we have been talking about. It is important to remember what it represents…it represents factor analysis from these tests, a whole bunch of correlations. The ones with the W come from the Wechsler scale. There is the positive matrix and these things are centered around the positive matrix (you can see/or think about it as a 3D map)what people often say is consistent with our view of intelligence, the peak of the manifold (mountain) represents something that is important and it is thought to represent general intelligence…. It is not clear however what general intelligence is. Obviously if you do a factor analysis and you choose a single factor that counts for most of the variability, and most of the correlations will be in the middle of the circle. So anytime you have a whole bunch of things that are correlated with one another, what people generally decide, it is centered on g…it is the most objective, peak of the manifold. G may or may not exist. But one of the arguments that are usually made is just because these positively correlated things have a structure, it is obvious that there will be one factor that will account for the most of the variation.
The central component of the main factor measures g and of course this means that something that is abstract, he has made it more concrete. One of the main arguments of intelligence testing, is the notion that what has happened is that they made something real from something that is not real. Everybody who would do a factor analysis, is where the peak of the manifold depends on how many tests there are, there needs to be an equal amount of tests all around it…. Remember this is what Thurstone did…it always depends on the test that you chose. Rearification it is not a right wing thought to rearify something that people chose the things to put g wherever you atre. In general they try to choose an equal amount of tests…but remember that when we are talking about g, we are not talking about raven matrices, or mental tests, we are talking about a correlational construct. Short-term memory is a skill, a thing that is something that exists in your brain (like a piggy bank that if you put too much money it will pop). It is not though…it is not a thing…it is an organizing principle for a number of empirical phenomena, the most original one is the 7-2 factor, Gr…to know that it is not a real thing and that it is a theoretical construct, short term memory does not exist in theory, it is more working memory, it is a way of