Brain imaging in catatonia: current findings and a pathophysiologic model.

Area of Science:

• Neuroscience
• Psychiatry
• Neurology

Background:

• Catatonia was initially described as a psychomotor disease with motor, affective, and behavioral symptoms.
• Historically, catatonia was viewed as a motor symptom of schizophrenia, leading research to focus on basal ganglia.
• Inconsistent findings in basal ganglia research prompted a reevaluation of catatonia's underlying mechanisms.

Purpose of the Study:

• To investigate the neural underpinnings of catatonia beyond traditional schizophrenia-related models.
• To explore the role of specific brain regions and neurotransmitter systems in catatonia.
• To re-examine catatonia as a potential model for understanding general psychomotor and brain function.

Main Methods:

• Review of historical perspectives on catatonia.
• Analysis of recent brain imaging studies, particularly those using functional neuroimaging techniques.
• Exploration of neurochemical interactions, specifically gamma-aminobutyric acid (GABA)-ergic and glutamatergic transmission.

Main Results:

• Recent studies identify significant alterations in a right-hemispheric neural network, including the medial and lateral orbitofrontal and posterior parietal cortex.
• Evidence suggests abnormal modulation of this network by altered functional interactions between GABAergic and glutamatergic neurotransmission.
• These findings offer a potential explanation for the complex interplay of motor, emotional, and behavioral symptoms in catatonia.

Conclusions:

• Catatonia research has shifted focus to specific neural networks and neurochemical pathways.
• The identified right-hemispheric network and neurotransmitter interactions are crucial for understanding catatonia's diverse symptoms.
• Catatonia may serve as a valuable model for investigating broader aspects of psychomotor and brain function.