A Canonical Correlation Approach Towards Identifying Latent Neurofeedback Responses in Patients with Schizophrenia

Area of Science:

• Neuroscience
• Cognitive Psychology
• Psychiatry

Background:

• Schizophrenia is linked to frontal gamma dysregulation and cognitive impairments.
• Frontal gamma coherence (gcoh) is a key indicator of brain activity relevant to cognitive function.
• Working memory (WM) deficits are common in schizophrenia patients.

Purpose of the Study:

• To evaluate a novel neurofeedback (NFB) protocol designed to improve self-regulation of frontal gamma activity.
• To investigate treatment responses to gamma coherence neurofeedback (gcoh-NFB) based on baseline working memory (WM) function.
• To analyze the neurophysiological and cognitive effects of gcoh-NFB in schizophrenia.

Main Methods:

• A double-blind, placebo-controlled randomized clinical trial was conducted.
• Participants received either active gcoh-NFB or placebo-NFB.
• Canonical correlation analysis (CCA) was used to examine neurophysiological and WM responses.

Main Results:

• Active gcoh-NFB modulated baseline gcoh levels, decreasing high gcoh in low-WM participants and increasing low gcoh in high-WM participants.
• Placebo-NFB did not alter gcoh levels.
• All participants receiving active gcoh-NFB showed improved WM compared to the placebo group.
• CCA revealed two significant components: one reflecting positive interactions and another reflecting diverging interactions between NFB and WM responses.

Conclusions:

• Gamma-neurofeedback (NFB) offers a promising therapeutic approach for improving cognitive function in schizophrenia.
• The gcoh-NFB protocol demonstrates adaptable neurophysiological effects, benefiting individuals with varying baseline working memory capacities.
• The findings suggest that gcoh-NFB can normalize frontal gamma activity and enhance working memory in schizophrenia patients.