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. Author manuscript; available in PMC: 2009 Apr 1.
Published in final edited form as: Neurobiol Aging. 2006 Dec 14;29(4):514–523. doi: 10.1016/j.neurobiolaging.2006.11.010

Fig. 6.

Fig. 6

Predictive accuracy as a function of the number of brain regions/clusters included in the classification process. Small number of regions is insufficient, whereas more than 30 regions result in insufficient training of the classifier, as we had 30 samples; this is the well-known “curse of dimensionality” in machine learning, and indicates that more extensive image databases might ultimately improve classification accuracy.