Scientists compare PET scans taken while volunteers read words with scans taken while the same volunteers look at meaningless letter shapes. The brightness of both displays is the same.
Why is this comparison more useful than comparing reading with closing the eyes?
it prevents all brain regions from using glucose during the comparison task
it helps separate activity associated with reading from activity associated with seeing
it helps separate activity associated with reading from activity associated with breathing
it prevents all brain regions from taking up tracer during the comparison task
43 exam-style questions on Edexcel GCSE Biology 2.3 The nervous system and brain, covering 2.3.1 Structures and functions of the brain, 2.3.2 Imaging brain function with scanning, 2.3.3 Limitations in treating nervous system damage, 2.3.4 Neurones and impulse transmission, and 2.3.5 Structure and function of a reflex arc. Each one has a worked solution and a mark scheme showing where the marks go.