Emotional effect on cognitive control in implicit memory tasks in patients with schizophrenia

Area of Science:

• Neuroscience
• Cognitive Psychology
• Psychiatry

Background:

• Schizophrenia is associated with significant impairments in cognitive and emotional functions.
• Understanding the neural underpinnings of these deficits is crucial for developing effective treatments.

Purpose of the Study:

• To investigate the effect of emotion on cognitive control in patients with schizophrenia during an implicit memory task.
• To compare brain activity using functional MRI (fMRI) between schizophrenia patients and healthy controls using emotionally neutral and unpleasant words.

Main Methods:

• Functional magnetic resonance imaging (fMRI) was employed in 15 patients with schizophrenia and 15 healthy controls.
• Participants performed implicit memory retrieval tasks involving both emotionally neutral and unpleasant words.
• Analysis focused on identifying differences in brain activation patterns between groups and correlating neural activity with clinical symptoms.

Main Results:

• During neutral word retrieval, schizophrenia patients showed increased activation in the precuneus, superior parietal gyrus, and dorsolateral prefrontal cortex (dlPFC) compared to controls.
• With unpleasant words, patients exhibited broader activation, including temporal, fusiform, parietal, occipital, and limbic areas (amygdala, insula), alongside precuneus, superior parietal gyrus, and dlPFC.
• Positive correlation found between dlPFC activity and negative symptom scores (PANSS) in schizophrenia patients during unpleasant word retrieval.

Conclusions:

• Emotion significantly modulates cognitive control network activity in schizophrenia, with distinct neural patterns observed for neutral versus unpleasant stimuli.
• Abnormal activation in regions like the dlPFC during emotional memory retrieval may underlie cognitive and emotional deficits in schizophrenia.
• These findings offer insights into the neural mechanisms of impaired cognitive and emotional processing in schizophrenia.