Amygdala Function, Blood Flow, and Functional Connectivity in Nonclinical Schizotypy

Area of Science:

• Neuroscience
• Psychiatry
• Brain Imaging

Background:

• Schizotypy is a risk marker for schizophrenia spectrum disorders.
• Amygdala dysfunction is implicated in schizophrenia.
• Subclinical schizotypy may correlate with amygdala alterations in healthy populations.

Purpose of the Study:

• To investigate amygdala function and structure in healthy individuals with varying levels of schizotypy.
• To identify potential neurobiological markers associated with schizotypy traits.

Main Methods:

• Sixty-three healthy subjects were divided into high and low schizotypy groups.
• Multimodal neuroimaging included fMRI during emotional face recognition, arterial spin labeling for rCBF, resting-state fMRI for FC, and structural MRI.
• Schizotypy was assessed using the Oxford-Liverpool Inventory of Feelings and Experiences.

Main Results:

• Higher schizotypy was associated with increased right amygdala activation when viewing fearful faces.
• Individuals with higher schizotypy showed reduced resting-state functional connectivity between the left amygdala and a cerebellar cluster.
• No significant differences were found in resting-state amygdala regional cerebral blood flow or volume between groups.

Conclusions:

• Schizotypy influences amygdala function, particularly during emotional processing, independent of baseline structural or blood flow differences.
• Functional alterations in the amygdala related to schizotypy may only become apparent under specific cognitive or emotional challenges.
• These findings highlight the role of amygdala functional dynamics in the expression of subclinical schizotypy.