4.7 Typically, the database of known faces used by an automatic face recognition system includes just one image of each person's face. For each approach discussed in this chapter-feature based and holistic-briefly discuss whether having in the database additional images of each face would probably improve, degrade, or have no effect on the accuracy of the system. Palmeri, T. J., & Gauthier, I. (2004). Visual object understanding. Nature Reviews Neuroscience, 5, 291-303. A review of two major research themes: object identification (how a decision is made about an object's unique identity) and object categorization (how a decision is made about an object's kind or category). on der Heydt, R. (2004). Image parsing mechanisms of the visual cortex. In L. M. Chalupa & J. S. Werner (Eds.), The visual neurosciences (Vol. 2, pp. 1139-1150). Cambridge, MA: MIT Press. A brief review of the neural basis of perceptual organization. +