A clinical database contains records of people whose finger movements changed after brain damage. In one set of records, damage was confined to one region. In another set, several regions were damaged.
Why would records from the first set be more useful for investigating brain function?
Any change in finger movement can be linked to the one region that was damaged.
The first set contains more people, so its results on finger movement are more reliable.
Damage to one region causes a larger change in finger movement, so it is easier to measure.
Each record shows that the damaged region controls every movement the person makes.
135 exam-style questions on OCR GCSE Biology 3.1 Coordination and control – the nervous system, covering 3.1.1 Structure of the nervous system, 3.1.2 Coordinated response, 3.1.3 The reflex arc, 3.1.4 Structure of the eye, 3.1.5 Defects of the eye, 3.1.6 Structure and function of the brain, 3.1.7 Difficulties of investigating brain function, and 3.1.8 Limitations in treating nervous system damage. Each one has a worked solution and a mark scheme showing where the marks go.