highly significantP<0.01
General costs Both humans and monkeys showed highly significant general costs in terms of ER, as previously defined (humans: 2.7%, F(1, 7) = 18.7, P<0.01; M1: 4.7%, F(1, 81) = 46,7, P<0.0001; M2: 2.9%, F(1, 39) = 46.7, P<0.0001; Figure 6 ).