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. 2021 Apr;53(8):2681-2695.
doi: 10.1111/ejn.15162. Epub 2021 Mar 26.

Expectancy changes the self-monitoring of voice identity

Joseph F Johnson  1 , Michel Belyk  2 , Michael Schwartze  1 , Ana P Pinheiro  3 , Sonja A Kotz  1   4
Affiliations

Expectancy changes the self-monitoring of voice identity

Joseph F Johnson et al. Eur J Neurosci. 2021 Apr.

Abstract

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.

Keywords: auditory feedback; fMRI; motor-induced suppression; source attribution; voice morphing.

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Figures

FIGURE 1
FIGURE 1
Psychometric Voice Attribution Task (VAT): Active = button‐press condition; Passive = hearing conditions, * = affected by individual motor response‐time variability; Response = two‐alternate forcedchoice (“The voice sounded more like me.” or “The voice sounded more like someone else.”)
FIGURE 2
FIGURE 2
fMRI Voice Perception Task (VPT): Active = button‐press condition; Passive = hearing conditions, * = affected by individual motor response‐time variability
FIGURE 3
FIGURE 3
fMRI Regions of Interest: Blue: right inferior frontal gyrus; MNI coordinates x 58, y 2, z −10; determined from ALE neuroimaging meta‐analysis (Johnson et al., 2019). Red: right anterior superior temporal gyrus; MNI coordinates x 46, y 10, z 4; determined in our sample from fMRI temporal voice area localizer task
FIGURE 4
FIGURE 4
fMRI Voice Perception Task (VPT) LMM Results: Linear mixed model analysis on ROIs in A) right anterior superior temporal gyrus (aSTG) and B) right inferior frontal gyrus (IFG). Active: button‐press condition, passive: hearing condition, SV: self‐voice, UV: uncertain‐voice, OV: other‐voice. Hypothesis‐driven analysis in right aSTG confirmed motor induced suppression (for contrast active > passive) for only SV as compared to UV or OV (t(119) = −2.7, p = .021)
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