I don't consider these to be significant changes to the structure of the brain, so it shouldn't affect natural intelligence, any more than creating or deleting files on your computer would affect its processor speed.
Check out the
Horn-Cattell theory of cognitive abilities. Although "processing speed" and "decision/reaction time/speed" are important in your comment, I think that "fluid intelligence" is more important than you are giving credit for. (Fluid intelligence relates to "metacognition" or "executive" processes that control the strategies and tactics used in intelligent behavior." ~Quote from link, above.) Fluid intelligence is influenced by more than the physical infrastructure of the nervous system - it is also influenced by the efficiency of the patterns of neural firing within an individual brain.
Next check out
Steinberg's triarchic theory. I think that overall intelligence
can be improved by taking a more deliberate approach to influencing the "componential" aspect of this theory. Using your computer analogy, a machine's processor speed is essentially constant, but software efficiency is important, too. Though files don't affect processor speed, they can affect efficiency. Just as you can replace inefficient software on a computer, would you agree it's possible to increase an adult's mental efficiency through the right kind of training, thereby increasing their intelligence?
Howard Gardner's theory of multiple intelligence divides intelligence into several categories: These can be thought of as "pathways to learning" or "axes of measurement" that you might find on a more complete IQ test.
- Verbal/Linguistic
- Logical/Mathematical
- Visual/Spatial
- Musical/Rhythmic
- Bodily/Kinesthetic
- Interpersonal
- Intrapersonal
- Naturalist
- Existential
This list can be further sub-divided, or even restructured for the sake of argument so that you have things like football intelligence, or even Rubik's Cube intelligence.
As an example, figuring out how to solve the 3x3 would show a very high spatial and logical intelligence... but how many people
figured out how to solve a 3x3
by themselves? I suspect that the vast majority of people who can solve the cube learned from a book, a friend, or from youtube as I did. Regardless of how they learned, there are several people on this forum like you who can solve a 3x3 very quickly. I think this indicates high visual-spatial, logical-mathematical, and bodily-kinesthetic intelligences. Although I am still struggling toward sub-30, my skills are enough to impress non-cubers... to solve a cube in around 10 seconds must require a much higher level of dexterity, visual attention, pattern recognition, and memory. Oh, and I hope that this forum, youtube, practice and other kinds of training, will help me increase my cube intelligence.
Keep in mind that I think of intelligence as essentially a combination of learning speed, and of how well you can think (solve problems) given your knowledge.
If I gave examples of how you could increase learning speed and problem solving abilities, would you agree it is possible to increase your intelligence?