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PLATE I 



The extent of lesions in animals which learned the double-platform box after 

 operation. The figures are arranged in groups of four, representing the dorsal 

 and lateral aspects of the hemispheres and a horizontal section at the level of the 

 ventricals. The degenerated areas are shown in black. Other areas certainly 

 non-functional are dotted. 



FIGS. 1-6. Injury to one hemisphere only (group 2). 



FIGS. 7-9. Occipital cases (group 3). 



