IQ exists.It is like physical power.
What are you measuring? What power, where is it, what is it depending on, how much of that concept is given by nature, how much is developed, and what are the consequences of having some IQ score in your personal achievements?
and say that IQ tests only measure your ability to complete IQ tests. ie they measure nothing significant.
I said the same thing in some previous posts.
The best operational definition of IQ is that is the thing IQ instruments are measuring. The end.
It's a sh1tty and pretty empty concept. Based solely on comparison beetween people your age in your culture. that number is giving just your position in your age group in your country, where instrument was previously standardized.
If they were measuring intelligence why does IQ get recalibrated every decade or so.
I know that, learned that in studies.
Look above. there are few explanations for that, but for me it's one more proof not to take it to seriously.
Southern, to me it looks like you are putting the equal sign between brightness and IQ. They are different. One is an amateur concept, we all feel that some people are smart, but what will the instrument say can be problematic because it includes knowledge we got through education, so person who maybe ( not measurable still) has better given abilities will score less than somebody educated and maybe not so fast in processing inf.
How much is persons IQ depending on early development circumstances, how much on biological traits?
It's a thin ice, nobody can give you solid answer still.
GIVE UP IQ!
I also agree with Southern that IQ is a valid concept, while remaining agnostic about IQ testing methods.
Without being at least a little bit familiar with the instruments, you don't have basis for supporting the concept of IQ.Again, the score is showing your position within your age gruop in your country. That' s it.
There are many theories of intelligence, what is it made of, it's all more or less bla, bla.
We all have our implicit theories of what it is, so don't hold on just to the official story.
We can all share here our ideas about what it is, but it doesn't have anything to do with IQ from scientific standpoint, as it is conceptualized and used now.