Effect of complete stimulus predictability on P3 and N2 components: an electroencephalographic study

Area of Science:

• Cognitive Neuroscience
• Auditory Perception
• Event-Related Potentials

Background:

• Human experience involves both predictable and unpredictable events.
• Self-initiated actions can influence perceptual processing.
• The P3 and N2 event-related potentials reflect cognitive processing.

Purpose of the Study:

• To investigate how self-initiated auditory stimuli modulate P3 and N2 components in an oddball paradigm.
• To explore the role of predictability and self-initiation in sensory processing.
• To test the hypothesis that predictive forward models explain these modulations.

Main Methods:

• Utilized an oddball paradigm with auditory stimuli.
• Manipulated the self-initiation and predictability of stimulus presentation.
• Measured P3 and N2 components of event-related potentials.

Main Results:

• Fully self-determined stimulus sequences led to attenuated P3 and N2 components compared to computer-controlled sequences.
• Self-initiating stimulus onset, without knowing the stimulus type, increased both P3 and N2 components.
• These findings suggest a differential impact of action-outcome predictability on neural responses.

Conclusions:

• Predictive forward models provide a unifying explanation for the observed modulation of P3 and N2.
• Anticipated stimuli contingent on self-initiated actions lead to attenuated neural responses.
• Incongruity between expected and actual sensory consequences enhances neural responses, supporting predictive coding frameworks.