What is the name of the type of thinking that humans do naturally? What is the weakness of this type of thinking?

Since this is not my area of expertise in psychology, I searched Google under the key words "'thinking types'" to get this:

http://www.google.com/search?client=safari&rls=en&q=%22thinking+types%22&ie=UTF-8&oe=UTF-8

In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search. Also see http://hanlib.sou.edu/searchtools/.