Both male and female Restinga Antwrens sing. The loudsong (sensu Willis 1967) is a sequence of about four "chop" notes per second. The antwrens bob the tail while singing.
For a representative audio recording with sonogram, see audio
There are no differences in song structure or in syllables between Serra Antwren (Formicivora serrana) and Restinga Antwren (Firme and Raposo 2011), but phrases in the song of Restinga Antwren are faster than those of Serra Antwren (Gonzaga 2001, Firme and Raposo 2011).
The contact call is a sequence of "kee-ip" notes repeated every one to four seconds (Gonzaga and Pacheco 1990). The distress call is a constant repetition of the same harmonic rich fundamental note (Gonzaga 2001). Other types of calls, such as for alarm, foraging, aggression and display, are not yet described.