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Figure 1. Monopolar recordings from basal forebrain showing 
gradients of amplitude. The schematics represent horizontal 
sections through the cerebrum of the cat's brain; the location of 
each electrode is indicated by a numbered point. The notation 
"G-G"' indicates the recording between two reference electrodes. 
Electrode "G" was placed on the ipsilateral scalp and "G"' on the 
contralateral scalp. For abbreviations, see text. Time, 1 sec. 
262 
