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. 2014 Aug 7;(90):50107. doi: 10.3791/50107
MCH paired with shock 3-OCT paired with shock
Flies avoiding MCH (in OCT tube) = 80 Flies preferring MCH (in MCH tube) = 20 PI1- (80-20)/80+20) = 0.6 Flies avoiding OCT (in MCH tube) = 75 Flies preferring OCT (in OCT tube) = 25 PI= (75-25)/(75+25) =0.5
PI of the experiment= (0.6+0.5)/2=0.55