My voice or yours? An electrophysiological study

Area of Science:

• Neuroscience
• Auditory Perception
• Cognitive Neuroscience

Background:

• The ability to recognize one's own voice is crucial for social interaction and self-awareness.
• Electrophysiological methods offer insights into the rapid neural processes of auditory discrimination.

Purpose of the Study:

• To investigate the electrophysiological neural processes involved in discriminating one's own voice from unfamiliar voices.
• To identify specific event-related potential (ERP) components associated with own voice recognition.

Main Methods:

• Healthy participants (n=17) underwent electrophysiological recordings.
• Passive oddball paradigm using vowel /a/ sounds: own voice vs. two unknown voices.
• Analysis of event-related potentials, including mismatch negativity (MMN) and P3a components.

Main Results:

• Mismatch negativity (MMN) showed similar latency and amplitude for own and unfamiliar voices.
• P3a component amplitude was significantly smaller for own voice discrimination compared to unknown voices.
• An early pre-MMN response, linked to left inferior frontal cortex, was observed for own voice discrimination.

Conclusions:

• The P3a component plays a key role in distinguishing one's own voice from others.
• An early neural response originating from the left inferior frontal cortex contributes to own voice discrimination.
• Electrophysiological markers, including MMN and P3a, reveal distinct neural signatures for self-voice recognition.