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. 2019 Dec 26;117(2):1191–1200. doi: 10.1073/pnas.1916453117

Fig. 2.

Fig. 2.

Frequency discrimination with equal amplitudes. (A) Performance on the frequency discrimination task when stimulus amplitudes were equal, averaged across all electrodes (n = 1 each from monkeys A and B for the 20-Hz standard; n = 5 from monkeys A and B for both the 50-Hz and 200-Hz standard; n = 8 from monkeys A, B, and C for the 100-Hz standard). Different colors denote different stimulus amplitudes. Error bars show the SEM across electrodes. The animals achieved high performance for frequencies below 200 Hz. (B) Just noticeable difference (JND) as a function of standard frequency. JNDs at each amplitude were averaged for each electrode. (C) Weber fractions as a function of standard frequency. Error bars in B and C denote the SEM across all electrodes tested at each standard.