Differences in functional connectivity density among subtypes of schizophrenic auditory hallucination.

Area of Science:

• Neuroscience
• Psychiatry
• Brain Imaging

Background:

• Schizophrenia is characterized by auditory hallucinations (AH).
• Understanding the neural basis of AH subtypes is crucial for targeted treatments.
• Previous research has not fully differentiated brain function in distinct AH types.

Purpose of the Study:

• To investigate distinct brain function alterations in drug-naïve first-episode schizophrenia patients with different auditory hallucination subtypes.
• To compare brain functional connectivity patterns between patients with constant commanding and commenting auditory verbal hallucinations (CCCAVH) and nonverbal auditory hallucinations (NVAH).

Main Methods:

• Recruited three groups: 20 schizophrenia patients with CCCAVH, 15 with NVAH, and 20 healthy controls.
• Utilized global functional connectivity density (gFCD) analysis.
• Employed one-way analysis of covariance with statistical significance set at P < 0.05, applying family-wise error correction.

Main Results:

• CCCAVH group showed increased gFCD in Broca's area, superior temporal gyri, hippocampus, insula, and anterior cingulate; decreased gFCD in left temporoparietal junction.
• NVAH group exhibited increased gFCD in superior temporal gyri and default mode network (DMN); decreased gFCD in executive control network.
• Distinct functional brain patterns were identified between CCCAVH and NVAH subtypes.

Conclusions:

• Findings support the "inner speech" hypothesis for CCCAVH.
• NVAH is associated with superior temporal gyrus and DMN hyperactivity and prefrontal hypoactivity.
• Distinct neural mechanisms underlie different types of auditory hallucinations in schizophrenia.