Figure 1:

Schematic illustration of the reunion (greet) paradigm. Behavior is recorded using four channels of a Zoom recorder (F8): movement is recorded from a piezo sensor attached to the perch of a smaller cage (indicated via oscilloscope), and acoustic behavior is recorded using tie clip microphones (indicated via spectrogram). Using MATLAB, we quantified (1) the number of calls (2) the number of movements (3) the temporal correlation of calling (sliding correlation of calling between the two birds), and (4) the temporal correlation of movement (sliding correlation of movement between the two birds).