Neuroanatomical correlates of cognitive self-appraisal in neurodegenerative disease

Abstract

Self-appraisal is a critical cognitive function, which helps us to choose tasks based on an accurate assessment of our abilities. The neural mechanisms of self-appraisal are incompletely understood, although a growing body of literature suggests that several frontal and subcortical regions are important for self-related processing. Anosognosia, or lack of awareness of one's deficits, is common in neurodegenerative dementias, offering an important window onto the brain systems involved in self-appraisal. We examined the neuroanatomical basis of self-appraisal in a mixed group of 39 individuals, including 35 with cognitive impairment due to one of several probable neurodegenerative diseases, using voxel-based morphometry and an objective, neuropsychologically-based measure of self-appraisal accuracy. Self-appraisal accuracy was correlated with tissue content in the right ventromedial prefrontal cortex (vmPFC). We hypothesize that emotional/physiological processing carried out by vmPFC is an important factor mediating self-appraisal accuracy in dementia.

Copyright 2009 Elsevier Inc. All rights reserved.

Figures

Fig. 1

Bell curve picture used to help patients estimate their performance.

Fig. 2

Histogram of self-appraisal ratings in each of the major diagnostic groups and across the entire group of participants.

Fig. 3

Cognitive performance, in terms of percentile vs. discrepancy between cognitive performance and self-appraisal.

Fig. 4

Regions where gray matter content is correlated with self-appraisal accuracy (independent of actual performance).