Fig. 12.
Order selectivity of the entire population of X neurons recorded in ts cut birds. Paired comparisons of mean RS show greater responses to tsBOS and tutor song than to reverse (A) and reverse order (B) versions of these songs. C, Paired comparisons show greater RS to tsBOS than to syllable reverse tsBOS. InA–C, error bars indicate SEM, andasterisks mark significant differences between song pairs. D, The mean RS of each X neuron to tsBOS is plotted against its mean RS to reverse tsBOS. The diagonal line indicates where cells would lie if their responses to the two stimuli were equal. Black circles indicate those cells whose responses to the stimulus on the abscissawere significantly greater than its responses to theordinate stimulus (p < 0.05, unpaired t test). E, The mean RS of each X neuron to tutor song is plotted against its mean RS to reverse tutor song. Conventions are as in D.