Thalamocortical connectivity during resting state in schizophrenia

Area of Science:

• Neuroscience
• Psychiatry
• Brain Imaging

Background:

• Schizophrenia is associated with disrupted large-scale brain network connectivity.
• Altered thalamocortical connectivity is a potential mechanism for widespread brain dysfunction in schizophrenia, but remains poorly understood.

Purpose of the Study:

• To directly assess differences in thalamocortical functional connectivity between schizophrenia patients and healthy controls using resting-state functional magnetic resonance imaging (fMRI).

Main Methods:

• Analysis of resting-state fMRI data from 22 individuals with schizophrenia and 22 matched healthy controls.
• Direct assessment of functional connectivity between thalamic and cortical regions.

Main Results:

• Schizophrenia patients showed significantly higher overall thalamocortical functional connectivity compared to controls.
• This increase was primarily driven by altered connections between the thalamus and right ventrolateral prefrontal cortex, bilateral secondary motor areas, and sensory cortical areas (superior temporal and lateral occipital).
• Voxelwise analysis indicated group differences in medial and anterior thalamic nuclei, with patients exhibiting increased positive correlations and a lack of negative correlations in sensory cortical connections.

Conclusions:

• Thalamocortical dysfunction, including a lack of inhibitory interactions (negative correlations), contributes to network alterations in schizophrenia.
• These findings underscore the critical functional role of the thalamus in the pathophysiology of schizophrenia.