Discrimination of Simultaneous Melodies
This study examined first-, third-, and fifth-graders' ( n = 73) ability to hear two simultaneous melodies. Two familiar melodies and one unfamiliar melody were used as the stimuli. The pairs of simultaneous melodies were presented in different register and timbre combinations. The children were asked to press specially labeled keys on a computer keyboard to indicate which song(s) they heard. Responses were recorded by a computer. The older children identified two simultaneous melodies faster and more accurately than the younger ones did. While 70% of the first graders reported hearing two melodies and identified them with 75 % accuracy, more than 95% of the fifth graders reported hearing two melodies and identified them with 97%) accuracy. Children who were able to correctly identify two simultaneous melodies identified the melody in the upper register first significantly more often than the one in the lower register. However, when the melodies were played with contrasting timbres (trumpet and piano), they tended to identify the trumpet melody before they identified the piano melody regardless of register. Children who were only able to identify one melody tended to focus on the upper melody when the timbre was the same in both registers, but when the melodies were played with contrasting timbres, they attended to the trumpet melody regardless of register.