Dr. Nicoll explains that all our mind centres can be described as functions that have much in common by having their own ‘centre of gravity’, but at the same time, each has its own peculiar characteristics and its own kind of intelligence.
We find when we observe ourselves that we have four separate mind centres that we can recognise in ourselves. We have an intellectual centre that directs our intellectual or thinking functions. An emotional centre that controls our emotions and feelings. A moving centre that controls all external body movements such as walking, writing and speaking. And an instinctive centre that includes all the metabolic activity of the body such as breathing, digestion and blood circulation.
(Read more on this from the book itself. An electronic version of this book is available from the link on the right.)