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 PI2 = (75-25)/(75+25) =0.5 |
PI of the experiment= (0.6+0.5)/2=0.55 |