Fig 4. Timing of calls relative to calls from partner and other animals.

A. Call rate in relation to calls from the partner and other animals in the room. There is a transient increase in call rate shortly after calls from the partner, but not after calls from other animals. Shaded areas indicate the standard error of mean. B. Results from a subset of 6 animals (3 pairs) with an array of microphones in the room, showing a similar pattern as in A, confirming the result found with wearable recorders alone. C. Trills versus all other call types combined. The peak is absent for other call types, showing that the temporal relation at this latency mainly involves trill calls. D. Trill call rate in relation to calls from the partner when together in the home cage, the partner is out, or the animal him/herself is out. This shows that responsiveness to the partner’s calls is strongest when the animal him/herself is out. E. Peak in call rate 0.4–0.9 s after calls from the partner in males and females. In the Together condition, males had a significantly higher peak call rate than females.