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Increased grey matter was found in the brains of taxi drivers compared with controls in two brain regions, the right and left hippocampi. The increased volume was found in the posterior (rear) hippocampus.

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According to Maguire, the role of the hippocampus is to facilitate spatial memory, in the form of navigation. From previous studies (pre-Maguire) it was impossible to know whether differences in brain anatomy are predetermined, or whether the brain is susceptible to plastic changes, in response to environmental stimulation – in this case driving a taxi.

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To investigate whether doing a job that demands navigational experience, and spending more years in that job, affect the volume of the hippocampus.

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compared 16 right-handed male taxi drivers and 50 non-taxi-driving controls, matched for gender, handedness and age range.
DV was hippocampal volume, measured with an MRI scan.

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research methods
-scanning procedure took place in a highly controlled environment, using a carefully selected sample - which eliminated many extraneous variables.
sampling bias
-all male right handed sample which may limit generalisation of the findings, as navigation by females or left handed people may differ.

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Key information for a few of the Core Studies featured on the Psychology OCR AS Level specification. Learn with flashcards, games, and more - for free.