Figure 1.

Significant interaction between female (N = 20) auditory temporal resolution (i.e. auditory filter width measured via equivalent rectangular bandwidth, ERB) and the ending portion of the male cowbird song (i.e. the P2, song factor 3, see text for more details) on female CSD duration. As factor 3 increases, the P2 decreases in frequency but increases in Wiener entropy and duration. Each point illustrates a single female response to a stimulus. To illustrate the interaction, we divided females into quartiles based on their ERB values: (a) lowest 25% of ERB values, (b) mid-low ERB values (26–50%), (c) mid-high ERB values (51–75%), and (d) highest ERB values (greater than 76%). However, ERB value was treated as a continuous variable in the statistical model. Note the change in slope from panel (a) to panel (d) females with narrow auditory filters preferred songs with longer duration, higher Wiener entropy and lower average frequency while females with wider auditory filters preferred songs with shorter duration, lower Wiener entropy and higher average frequencies.