Somatosensory omissions reveal action-related predictive processing.

Area of Science:

• Neuroscience
• Cognitive Science
• Psychology

Background:

• The link between actions and sensory perception is well-studied.
• Forward models suggest predictions of sensory outcomes from actions.
• Auditory omission responses indicate prediction errors, but cross-modal generalization is unclear.

Purpose of the Study:

• To investigate action-induced somatosensory omission responses using electroencephalography (EEG).
• To determine if prediction error mechanisms generalize from auditory to somatosensory modalities.

Main Methods:

• Human participants performed self-paced button presses.
• Button presses were predictably (88%) or unpredictably (50%) coupled with tactile stimuli.
• EEG recorded neural activity, analyzed via temporal principal component analysis.

Main Results:

• Predictable stimulus omission (88% condition) elicited a distinct neural response (oN1, oN2, oP3).
• The oN1 response indicated sensory sources outside primary cortex.
• Later components (oN2, oP3) suggested modality-unspecific higher-order processing.

Conclusions:

• This study provides direct evidence for somatosensory predictions during action.
• Findings support a partially amodal (cross-sensory) mechanism for generating prediction errors.