Schizophrenia and the mirror system: an essay

Area of Science:

• Neuroscience
• Evolutionary Biology
• Psychiatry

Background:

• The mirror system, observed in macaques and humans for grasping, is hypothesized to be foundational for the evolution of the language-ready human brain.
• Understanding the link between motor control (hand movements) and speech production is crucial for neurological and psychiatric research.

Purpose of the Study:

• To explore the relationship between the mirror system, hand movements, and speech evolution.
• To investigate the mechanisms underlying action attribution deficits in schizophrenia, specifically in relation to self-monitoring and agency.

Main Methods:

• Analysis of mirror system data in macaque and human grasping.
• Theoretical discussion on the link between manual actions, speech, and self-attribution.
• Examination of the proposed pathway for verbal hallucinations in schizophrenia.

Main Results:

• The mirror system hypothesis provides a basis for understanding language evolution.
• A distinction is made between self-monitoring and attribution of agency in action generation.
• Verbal hallucinations in schizophrenia may arise from a failure to record the creation of an utterance, leading to its misattribution.

Conclusions:

• The mirror system plays a role in the evolution of language.
• Schizophrenia may involve a breakdown in the attribution of self-generated actions, both manual and verbal.
• A novel theory suggests verbal hallucinations result from a failure in internal monitoring and subsequent confabulation of agency.