... the tow of these is largely a reciprocal one. An understanding of biological processes can begin to explain how the functioning of the brain and nervous system, can lead to specific behaviours. Technology is now so advanced that it allows for the brain to be scanned, using Positron Emission Tomography (PET), a non-invasive imaging technique, while the participant undergoes certain tasks, such as clenching a fist or recalling memories. The region of brain involved can be seen to be active on the scan. This area of biology can make a valuable contribution to our understanding of certain behaviours, as it allows comparisons to be made between different participants. It is possible for large amounts of data to be gathered so that links can be made between the task in question and brain activity. PET can also look at malfunction in the brain - for example, low activity in a region ...

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