Females preferred the Solver song in all stimulus sets
The third Bayesian model (Fig. 3 ) confirmed a general preference
for Solver songs and showed that in each stimulus set, Solver song was
preferred over Non-Solver song. Aggregate preference for Solver song was
0.608 (95% confidence intervals: 0.592, 0.625). Aggregate preference
for Non-Solver song was 0.392 (95% confidence intervals: 0.374, 0.408).
In the stimulus set that was furthest apart in preference, Solver song
had an estimated preference of 0.682 (95% confidence intervals: 0.669,
0.695) while Non-Solver song had an estimated preference of 0.318 (95%
confidence intervals: 0.305, 0.331). In the stimulus set that was
closest in preference, Solver song had an estimated preference of 0.523
(95% confidence intervals: 0.551, 0.535), while Non-Solver song had an
estimated preference of 0.477 (95% confidence intervals: 0.564, 0.489).
Even in the closest stimulus set, 95% confidence intervals did not
overlap (thus making it a 5% or less chance that the Non-Solver song
was preferred over the Solver song). We can therefore say that Solver
song was preferred in all stimulus pairs and that population preference
for Solver song (see Fig. 2 ) was not driven by one or two
particularly attractive Solver songs, but by a consistent pattern in
preference across all six stimulus sets.
These patterns remained consistent when the 6thstimulus set was dropped (Solver preference by stimulus set: 0.597, 95%
credible interval: 0.583, 0.613; Non-Solver preference by stimulus set:
0.403, 95% credible interval: 0.387, 0.417).