Two singers, both professional tenors of the same technical level, vocally performed a predetermined sequence on the same note in two different listening conditions (one singer for each condition): Electronic Ear Condition 1, having vocal emission set to ideal parameters, and Electronic Ear Condition 2, having vocal emission set to neutral parameters. Measures were carried out through the comparative analysis of the obtained sonograms; this analysis highlighted the difference between the amplitudes of the sinusoidal wavelength, and, in the frequency spectrum, highlighted the increase of the high-quality singing emission parameters according to the neurophysiological patterns proposed by Tomatis®. Our pilot study shows a clear improvement in the richness of harmonics and in the density of the vocal timbre for the singer in the Electronic Ear Condition 1, compared to the singer in the Electronic Ear Condition 2.
