In our latest group session, we presented the results of a study focused on preparatory brain activity and how it is altered in individuals with schizophrenia. Using electroencephalography (EEG) analysis, we explored the mechanisms of “corollary discharge,” which allow the brain to predict the sensations produced by our own actions.
The Readiness Potential: The Prelude to Behavior
We discussed the concept of the Readiness Potential, a slow negative brain wave that appears up to two seconds before we perform a movement or start speaking. This mechanism is vital because it helps the brain differentiate between sounds we generate ourselves and those coming from the environment.
Our data shows that while healthy controls exhibit clear brain preparation before emitting speech, this activity is significantly reduced or altered in patients with schizophrenia.
Key Findings from the Session:
- Alteration in the Theta Band: Results indicate that communication between motor and sensory areas (fronto-temporal connectivity) in the Theta frequency is essential for correct sensory prediction. In patients, this synchronization does not occur properly during speech.
- Unexpected “Hyper-alertness”: A surprising finding in our research is that, during passive listening conditions, patients show a peak in brain synchrony much earlier than controls. This could be interpreted as a state of “hyper-alertness” or an excessive anticipation of external stimuli.
- Clinical Implications: We debated how this lack of attunement between the intention to act and sensory perception could underlie symptoms such as auditory hallucinations, where the individual fails to recognize their own internal voice as their own.
Next Steps
These results open new avenues for understanding schizophrenia not just as a disorder of perception, but as an alteration in how the brain anticipates reality. Our next step will be to correlate these “hyper-anticipation” patterns with specific clinical profiles.
You can watch the full technical session here: https://youtu.be/mhrvXNww2v4