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Publication
Expectancy changes the self-monitoring of voice identity
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Advisor(s)
Abstract(s)
Self-voice attribution can become difficult when voice characteristics are ambiguous,
but functional magnetic resonance imaging (fMRI) investigations of such ambiguity are sparse. We utilized voice-morphing (self-other) to manipulate (un-)certainty
in self-voice attribution in a button-press paradigm. This allowed investigating how
levels of self-voice certainty alter brain activation in brain regions monitoring voice
identity and unexpected changes in voice playback quality. FMRI results confirmed
a self-voice suppression effect in the right anterior superior temporal gyrus (aSTG)
when self-voice attribution was unambiguous. Although the right inferior frontal
gyrus (IFG) was more active during a self-generated compared to a passively heard
voice, the putative role of this region in detecting unexpected self-voice changes
during the action was demonstrated only when hearing the voice of another speaker
and not when attribution was uncertain. Further research on the link between right
aSTG and IFG is required and may establish a threshold monitoring voice identity in
action. The current results have implications for a better understanding of the altered
experience of self-voice feedback in auditory verbal hallucinations.
Description
Keywords
Auditory feedback fMRI Motor-induced suppression Source attribution Voice morphing
Pedagogical Context
Citation
Johnson, J. F., Belyk, M., Schwartze, M., Pinheiro, A. P., & Kotz, S. A. (2021). Expectancy changes the self‐monitoring of voice identity. European Journal of Neuroscience, 53(8), 2681-2695. https://doi.org/10.1111/ejn.15162