The average represented text lengthas function test text of lengthfor nine testers in Experiment 1. For ideal perception this should be an identity . The experiments show that averages of answers is very close to this prediction and may be correctly described by a linear regression , with γ values different for each tester but in all cases close to 1. For each tester we present the value of the linear regression coefficient γ and the coefficient of determination . The quality of the linear fits for was excellent (). On the other hand, the values of γ varied considerably between the testers, which indicates that the errors in answers were quite individual.