Abnormal cortical neural synchrony during working memory in schizophrenia

• Published in: Clinical neurophysiology 2018-01, Vol.129 (1), p.210-221
• Main Authors: Kang, Seung Suk, MacDonald, Angus W., Chafee, Matthew V., Im, Chang-Hwan, Bernat, Edward M., Davenport, Nicholas D., Sponheim, Scott R.
• Format: Article
• Language: English
• Subjects: Adult; Brain Waves; Case-Control Studies; Cortical source analysis; Cortical Synchronization; Female; Humans; Magnetoencephalography; Magnetoencephalography (MEG); Male; Memory, Short-Term; Middle Aged; Neural oscillation; Schizophrenia; Schizophrenia - physiopathology; Working memory
• ISSN: 1388-2457; 1872-8952
• DOI: 10.1016/j.clinph.2017.10.024

•In WM encoding, PSZ had deficient prefrontal θ ERS that predicted WM performances.•PSZ had prefrontal and parietal β ERD reductions during prolonged WM maintenance.•In retrieval/manipulation, PSZ had deficient γ ERS in premotor and parietal cortices. To better understand the origins of working memory (WM) impairment in schizophrenia we investigated cortical oscillatory activity in people with schizophrenia (PSZ) while they performed a WM task requiring encoding, maintenance, and retrieval/manipulation processes of spatial information. We examined time–frequency synchronous energy of cortical source signals that were derived from magnetoencephalography (MEG) localized to cortical regions using WM−related hemodynamic responses and individualized structural head-models. Compared to thirteen healthy controls (HC), twelve PSZ showed performance deficits regardless of WM−load or duration. During encoding, PSZ had early theta and delta event-related synchrony (ERS) deficits in prefrontal and visual cortices which worsened with greater memory load and predicted WM performance. During prolonged maintenance of material, PSZ showed deficient beta event-related desynchrony (ERD) in dorsolateral prefrontal, posterior parietal, and visual cortices. In retrieval, PSZ showed reduced delta/theta ERS in the anterior prefrontal and ventral visual cortices and diminished gamma ERS in the premotor and posterior parietal cortices. Although beta/gamma cortical neural oscillatory deficits for maintenance/retrieval are evident during WM, the abnormal prefrontal theta-frequency ERS for encoding is most predictive of poor WM in schizophrenia. Time-frequency-spatial analysis identified process- and frequency-specific neural synchrony abnormalities underlying WM deficits in schizophrenia.