Working memory in schizotypal personality disorder: fMRI activation and deactivation differences

Area of Science:

• Neuroscience
• Psychiatry
• Cognitive Psychology

Background:

• Schizotypal personality disorder (SPD) is a schizophrenia spectrum disorder with shared cognitive and biological characteristics.
• Working memory deficits are hypothesized to be a shared feature between SPD and schizophrenia.
• This study investigates working memory in SPD using functional magnetic resonance imaging (fMRI).

Purpose of the Study:

• To compare working memory performance between individuals with SPD and healthy controls (HC).
• To investigate neural activation patterns during a working memory task in SPD using fMRI.
• To identify differences in task-induced activation and deactivation between groups.

Main Methods:

• A block-design fMRI study involving 15 antipsychotic-naïve SPD subjects and 16 HC subjects.
• Participants performed a 2-back visual working memory task and a 0-back continuous performance task.
• Whole-brain analyses compared activation for 0-back vs. rest and 2-back vs. 0-back contrasts.

Main Results:

• No significant differences in task performance were observed between SPD and HC groups.
• SPD showed decreased activation in the left postcentral gyrus during the 0-back task.
• During the 2-back task, HC exhibited greater activation in several brain regions, while SPD showed decreased activation and task-induced deactivation in these areas.

Conclusions:

• Individuals with SPD can achieve working memory performance comparable to HC.
• Functional neural activation patterns differ significantly between SPD and HC during working memory tasks.
• Differential recruitment of neural resources in SPD may underlie their ability to match HC performance.