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- Title
Effect of temporal predictability on the neural processing of self-triggered auditory stimulation during vocalization.
- Authors
Zhaocong Chen; Xi Chen; Peng Liu; Dongfeng Huang; Hanjun Liu
- Abstract
Background: Sensory consequences of our own actions are perceived differently from the sensory stimuli that are generated externally. The present event-related potential (ERP) study examined the neural responses to self-triggered stimulation relative to externally-triggered stimulation as a function of delays between the motor act and the stimulus onset. While sustaining a vowel phonation, subjects clicked a mouse and heard pitch-shift stimuli (PSS) in voice auditory feedback at delays of either 0 ms (predictable) or 500-1000 ms (unpredictable). The motor effect resulting from the mouse click was corrected in the data analyses. For the externally-triggered condition, PSS were delivered by a computer with a delay of 500-1000 ms after the vocal onset. Results: As compared to unpredictable externally-triggered PSS, P2 responses to predictable self-triggered PSS were significantly suppressed, whereas an enhancement effect for P2 responses was observed when the timing of self-triggered PSS was unpredictable. Conclusions: These findings demonstrate the effect of the temporal predictability of stimulus delivery with respect to the motor act on the neural responses to self-triggered stimulation. Responses to self-triggered stimulation were suppressed or enhanced compared with the externally-triggered stimulation when the timing of stimulus delivery was predictable or unpredictable. Enhancement effect of unpredictable self-triggered stimulation in the present study supports the idea that sensory suppression of self-produced action may be primarily caused by an accurate prediction of stimulus timing, rather than a movement-related non-specific suppression.
- Subjects
EVOKED potentials (Electrophysiology); NEUROLOGY; SENSORY disorders; NEUROLOGICAL disorders; VOICE disorders
- Publication
BMC Neuroscience, 2012, Vol 13, Issue 1, p55
- ISSN
1471-2202
- Publication type
Article
- DOI
10.1186/1471-2202-13-55