Fig 1. Adaptation paradigm.

A, Tuning curve of one site and five proper frequencies that selected around the charactristic frequency. B, Two sequences that were utilized for investigating the adaptation effect. Seq.1 is control sequence that the selected frequencies were presented with equal probability in four intensities. Each frequency-level combination presented in 30 trials. Seq.2 is adapting sequence. In this prototype from selected frequencies, the middle one (f3) was chosen as an adapter frequency and the others were assumed neighboring frequencies. This adapter (middle frequency in level 60 dB) was presented randomly between the selected frequencies in four intensities, with the probability of 80% of all. The rectangular shows the basic of these two sequences in one specific intensity.