A stroke damaged regions of a patient's cerebrum and cerebellum.
After the stroke, the patient has difficulty speaking.
Why is it difficult to use this patient to find out which brain region controls speech?
More than one region was damaged, so the effect cannot be linked to one region.
The cerebellum controls speech, so the damage to the cerebrum can be ignored.
Speech is controlled by the medulla, so this patient gives no useful evidence.
Speech is an unconscious activity, so it is not controlled by any brain region.
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.