Gender expansive listeners utilize a non-binary, multidimensional conception of gender to inform voice gender perception.

Few studies on voice perception have attempted to address the complexity of gender perception of ambiguous voices. The current study investigated how perception of gender varies with the complexity of the listener's own gender conception and identity. We explicitly recruited participants of all genders, including those who are gender expansive (i.e. transgender and/or non-binary), and directed them to rate ambiguous synthetic voices on three independent scales of masculine, feminine, and "other" (and to select one or multiple categorical labels for them). Gender expansive listeners were more likely to use the entire expanse of the rating scales and showed systematic categorization of gender-neutral voices as non-binary. We propose this is due to repeated use of reflective processes that challenge pre-existing gender categories and the incorporation of this decision-making process into their reflexive system. Because voice gender influences speech perception, the perceptual experience of gender expansive listeners may influence perceptual flexibility in speech.