Deep Brain Stimulation-Induced Transient Effects in the Habenula

Area of Science:

• Neuroscience
• Psychiatry
• Neurosurgery

Background:

• The habenula, part of the epithalamus, is linked to psychiatric disorders such as mood disorders and schizophrenia.
• Understanding the habenula's function is crucial for developing novel therapeutic strategies for these conditions.

Purpose of the Study:

• To investigate the transient effects of deep brain stimulation (DBS) targeting the habenula.
• To explore the relationship between stimulation parameters and observed effects.
• To assess potential somatosensory mapping within the habenula.

Main Methods:

• Four patients (two with bipolar disorder, two with schizophrenia) underwent DBS surgery.
• Transient electrical stimulation was applied to eight DBS contacts per patient.
• Stimulation parameters included varying voltage (0-10V), pulse width (60 μs), and frequencies (60, 135 Hz).

Main Results:

• Out of 385 active trials, 221 elicited stimulation-induced effects.
• Common transient effects included numbness, heart rate changes, and pain.
• Numbness, heart rate changes, pain, and involuntary movements increased with higher stimulation voltage.
• Contralateral stimulation induced numbness in all body parts except the scalp.

Conclusions:

• Deep brain stimulation of the habenula can induce transient sensory and autonomic effects.
• Stimulus-response mapping suggests a potential somatosensory organization within the human habenula.
• These findings provide insights into habenular function and its role in psychiatric conditions.