Brain Advance Access originally published online on March 3, 2004
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Brain, Vol. 127, No. 4, 914-928, 2004
© 2004 Guarantors of Brain
doi: 10.1093/brain/awh108
The impact of extensive medial frontal lobe damage on ‘Theory of Mind’ and cognition
1 Institute of Cognitive Neuroscience, University College London, and 2 Division of Neuroscience and Psychological Medicine, Imperial College London, Charing Cross Hospital, London, UK
Correspondence to: C. Bird, 17 Queen Square, London WC1N 3AR, UK. E-mail: chris.bird@ucl.ac.uk
The ability of humans to predict and explain other people’s behaviour by attributing to them independent mental states, such as desires and beliefs, is considered to be due to our ability to construct a ‘Theory of Mind’. Recently, several neuroimaging studies have implicated the medial frontal lobes as playing a critical role in a dedicated ‘mentalizing’ or ‘Theory of Mind’ network in human brains. Here, we report a patient, G.T., who suffered an exceptionally rare form of stroke—bilateral anterior cerebral artery infarction, without rupture or the complications associated with anterior communicating artery aneurysms. Detailed high-resolution neuroanatomical investigations revealed extensive damage to the medial frontal lobes bilaterally, including regions identified to be critical for ‘Theory of Mind’ by functional neuroimaging of healthy human subjects. For the first time in such a patient, we carried out a thorough assessment of her cognitive profile including, critically, an experimental investigation of her performance on a range of tests of ‘Theory of Mind’. G.T. had a dysexecutive syndrome characterized by impairments in planning and memory, as well as a tendency to confabulate. Importantly, however, she did not have any significant impairment on tasks probing her ability to construct a ‘Theory of Mind’, demonstrating that the extensive medial frontal regions destroyed by her stroke are not necessary for this function. These findings have important implications for the functional anatomy of ‘Theory of Mind’, as well as our understanding of medial frontal function. Possible reasons for the discrepancies between our results and neuroimaging studies are discussed. We conclude that our findings urge caution against using functional imaging as the sole method of establishing cognitive neuroanatomy.
Key Words: Theory of Mind; mentalizing; medial frontal; anterior cingulate; anterior cerebral artery
Abbreviations: ACA= anterior cerebral artery; BA = Brodmann area; BADS = Behavioural Test of the Dysexecutive Syndrome; fMRI = functional MRI; IQ = intelligence quotient; NART-R = National Adult Reading Test—Revised; ToM = Theory of Mind; WAIS-R = Wechsler Adult Intelligence Scale—Revised.
Received June 13, 2003. Revised November 4, 2003. Accepted December 14, 2003.
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