What is the relationship between brain mass and intelligence?
Brain mass in absolute terms does not denote intelligence, it is more useful to look at in relation to the body size.
What is the Encephalisation quotient?
Is brain mass divided by body mass (percentage of the brain to the body) This is useful as a guide to the likelihood of intelligence.
Where is the Cerebral cortex? How is this different in humans compared to other animals?
The cerebral cortex is the outer most layer of the brain and contains many of our higher order abilities such as thinking and language. Ours is different to other animals as it is really well developed.
What are they ways we can understand the relationship between brain and behaviour?
One way to understand the relationship between the brain and behaviour is to study it when it is damaged either accidentally or deliberately.
Why are accidents and disease a limited approach to understanding the function of brain areas?
It is not done under controlled circumstances and therefor is it difficult to draw strong conclusions between damage and behaviour change. Particular in the instance of widespread multi-region damage.
Define invasive investigation
Psychosurgery, involving ablation or the removal or brain tissue, or inserting electrodes into a particular area of the brain. PET scan; involving the use of radioactive chemicals which are injected intravenously. The radioactive materials called radio-tracers then bind to different molecules in the brain such as glucose or water. The it is able to provide similar types of information to fMRI. DBS (Deep Brain Stimulation) involves the insertion of electrodes into the brain. This technique has been used to treat different disorders such as Parkinson's disease.