KAO LIANG CHOW 



519 



C2 



VH 



TEMP 



VIS 



Ml R- G 



TEMP 



VIS. 



POS. 

 NEG. 



Fig. 7 

 Graphs of monkey C2 on vertical and horizontal striations 

 discrimination and monkey Ml on red and green discrimi- 

 nation to indicate number of trials of temporal cortical 

 EEG (TEMP) showing a decreased or no decreased ampli- 

 tude, and of visual area tracings (VIS) showing photic 

 driving or no photic driving, i to 5 refers to successive 

 daily sessions of thirty trials each, with the corresponding 

 percentages of correct responses indicated below. Each 

 pair of vertical continuous bars are the fifteen daily posi- 

 tive trials, and each pair of vertical interrupted bars, the 

 fifteen daily negative trials. The first bar of each pair 

 indicates the number of trials of no decreased amplitude 

 EEG (TEMP) or of no photic driving (VIS). The second bar 

 of each pair indicates the number of trials that show 

 decreased amplitude EEG (TEMP) or photic driving 

 (VIS). A few trials are eliminated because of movement 

 artifacts. The connected curves depict systematic EEG 

 changes occurring only in negative trials. POS, positive 

 trials; NEG, negative trials; d, decreased EEG amplitude; 

 P, photic driving. 



