Sequence shared by members of the neighbourhood (microdialect).

Spectrograms (FFT length, 256; frame, 100%; Hanning window) of song parts produced by an individual (ind a), his adjacent neighbour (ind b) and his distant neighbour (ind c) whose songs had been broadcast during the playback experiment, all including the same shared sequence (*). Syllables composing the shared sequence are labelled with numbers 1 to 7, and the other syllables with numbers 8 to 18.