Brain, Vol. 125, No. 8, 1808-1814,
August 2002
© 2002 Guarantors of Brain
Neural correlates of self-reflection
Departments of 1 Clinical Neuropsychology and 2 Magnetic Resonance Imaging, Barrow Neurological Institute, St Josephs Hospital and Medical Center, Phoenix, AZ, USA
Correspondence to: Sterling C. Johnson, PhD, Clinical Neuropsychology, Barrow Neurological Institute, St Josephs Hospital and Medical Center, 222 W. Thomas Road 315, Phoenix, AZ 85013, USA E-mail: s2johns{at}chw.edu
The capacity to reflect on ones sense of self is an important component of self-awareness. In this paper, we investigate some of the neurocognitive processes underlying reflection on the self using functional MRI. Eleven healthy volunteers were scanned with echoplanar imaging using the blood oxygen level-dependent contrast method. The task consisted of aurally delivered statements requiring a yesno decision. In the experimental condition, participants responded to a variety of statements requiring knowledge of and reflection on their own abilities, traits and attitudes (e.g. I forget important things, Im a good friend, I have a quick temper). In the control condition, participants responded to statements requiring a basic level of semantic knowledge (e.g. Ten seconds is more than a minute, You need water to live). The latter condition was intended to control for auditory comprehension, attentional demands, decision-making, the motoric response, and any common retrieval processes. Individual analyses revealed consistent anterior medial prefrontal and posterior cingulate activation for all participants. The overall activity for the group, using a random-effects model, occurred in anterior medial prefrontal cortex (t = 13.0, corrected P = 0.05; x, y, z, 0, 54, 8, respectively) and the posterior cingulate (t = 14.7, P = 0.02; x, y, z, 2, 62, 32, respectively; 967 voxel extent). These data are consistent with lesion studies of impaired awareness, and suggest that the medial prefrontal and posterior cingulate cortex are part of a neural system subserving self-reflective thought.
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