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The effects of rTMS over orbitofrontal cortex on cognitive functions in first-episode schizophrenia
Qiang Hu1,2, Xiong Jiao1, YanLi Ding1
1Shanghai Mental Health Center, https://ror.org/05bd2wa15Shanghai Jiaotong University School of Medicine, Neuromodulation Center, Shanghai Engineering Research Center of Intelligent Psychological Evaluation and Intervention, Shanghai Key Laboratory of Psychotic Disorders, Shanghai 200030, PR China.
Background:
Cognitive impairment in first-episode schizophrenia (FES) is a major contributor to functional decline, but antipsychotics provide limited cognitive improvement, and few repetitive transcranial magnetic stimulation (rTMS) studies have targeted the orbitofrontal cortex (OFC). This study investigated whether right OFC rTMS enhances specific cognitive functions in FES and its relationship with symptom reduction.
Methods:
Ninety drug-naive FES patients were enrolled, with 48 receiving active right OFC rTMS and 42 sham stimulation for 20 sessions over 8 weeks, while all patients took olanzapine (10-20 mg/day). Cognitive function was assessed using the Chinese version of the MATRICS Consensus Cognitive Battery (MCCB) at baseline and week 4, and psychotic symptoms were rated with the Positive and Negative Syndrome Scale (PANSS).
Results:
Repeated-measures analysis of variance (RMANOVA) demonstrated a significant Time×Group interaction for visuospatial memory (assessed via the Brief Visuospatial Memory Test-Revised, BVMT; F = 5.079, df = 1, 83, p = 0.027, η2 = 0.058). Post hoc tests revealed significant BVMT improvement in the active group (p < 0.001) but not in the sham group (p = 0.312). In the active group, improvements in BVMT and Neuropsychological Assessment Battery (NAB) scores were significantly correlated with lower PANSS total scores after Bonferroni correction.
Conclusions:
These findings indicate that right OFC rTMS improves specific cognitive functions in FES, with cognitive benefits associated with symptom alleviation, supporting the right OFC as a promising target for cognitive intervention in FES.
