D&D sums it up pretty simply:
Intelligence determines how well your character learns and reasons.
Wisdom describes a character’s willpower, common sense, perception, and intuition. While Intelligence represents one’s ability to analyze information, Wisdom represents being in tune with and aware of one’s surroundings.
In that sense, a farmer could be poor in intelligence while rich in wisdom while a mad scientist could be brilliant in intelligence while suffering in wisdom. Taking "ability damage" for intelligence has them become simpler while a lack of wisdom has them approach madness.
Hm, I am no expert but my basic understanding of intelligence is related to problem solving. So you'd have to set a task/goal/problem first and judge intelligence based on how well the person can solve the problem or achieve what he/she wants to achieve. And yeah, depending on what tasks we're talking about, we can talk of different sorts of intelligence.
What's your opinion on intelligence? What is it for you?
In my opinion, intelligence isn't about knowledge and data.
It's about:
1. how fast you can understand new information you received
2. how well can you understand new information you received
3. how well can you integrate this information to your thought system
4. how are you able to use this information in the future
5. being able to separate trash information and valuable information
That is a good question. And a difficult one, as well! For even among those in science and psychology who seek to describe "intelligence," they arrive at many different conclusions—some of which contradict others.
There is for example, those who believe that there are many "kinds" of intelligence...an emotional intelligence, intra-personal intelligence, logical-mathematical intelligence. But how silly it is that there should be so many different kinds of intelligences such as these! Do we really call the dim-witted (yet proficient) socialite an "intelligent person?" I think not.
If I had to give a definition of intelligence, it would be: "the capacity of a person to consistently form accurate perceptions of those things he or she experiences, as well as the ability to make astute discriminations."
You have given a good definition as well. And at first, I thought it perfect! But after thinking about your criterion for a moment, I found myself disagreeing with your fourth criteria.
Perhaps this video explains in part why I have reservation about that one particular way that you define intelligence. I have other reasons for disagreeing with that single statement which you have made, but I believe that actually seeing a person who is intelligent, and yet unable to use his intelligence constructively, should suffice to explain why I feel as I do about that.