Poster E87, Monday, March 26, 2:30-4:30 pm, Exhibit Hall C
Similar motor-related sensory attenuation for tones and voices
Ana Pinheiro1, Michael Schwartze2, Sonja A. Kotz2; 1Voice, Affect and Speech Laboratory, Faculty of Psychology, University of Lisbon, Lisbon, Portugal, 2Basic and Applied NeuroDynamics Laboratory, Faculty of Psychology and Neuroscience, Department of Neuropsychology and Psychopharmacology, Maastricht University, Maastricht, The Netherlands
Perceiving one’s own voice relies on the capacity to predict the sensory consequences of self-generated vocalizations. Suppression of sensory cortical responses to self-generated stimuli is reflected in the suppression of the N1 event-related potential (ERP) to self- compared to externally-generated stimuli. However, the study of sensory suppression to self-voice stimuli is methodologically challenged by motor artifacts concomitant to voice perception and differences in self-voice perception due to bone conduction. Button press paradigms overcome these issues but most have focused on computer-modulated stimuli. Hence, it remains to be shown whether motor-related sensory attenuation occurs similarly for natural stimuli such as voices. Following a within-subjects design, nineteen college students were tested in an auditory task consisting of self-triggered and externally triggered tones or self-voices. Participants displayed a significant N1 attenuation effect in response to both self-triggered tones and self-triggered voices (F(4, 72)=7.286, p<.001). Sensory attenuation was similar for both stimulus types (p>.05). Together, these findings suggest that self-initiated auditory sensations are attenuated irrespective of the specific physical features of the stimulus. This allows tagging of sensations as self-produced to avoid confusion with sensations of the external environment.
Topic Area: PERCEPTION & ACTION: Audition