Fig. 6.

Song exposure does not cause weakened responses to learned songs in NCM. A: diagram showing modified recognition-training procedure where the starlings alternated between 1-h training and passive listening blocks. B: mean acquisition curve for the song recognition learned in the training block for 3 starlings. D′ values were calculated over blocks of 100 trials. Data are shown for the 1st 97 blocks—not the entirety of each starling's training. Error bars show SE. C: bar graph showing the z-scores of the firing rates to learned, unfamiliar, and passively heard songs for 26 NCM neurons. *P < 0.05. NS, P > 0.05. Error bars show SE.