{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,29]],"date-time":"2026-04-29T03:53:05Z","timestamp":1777434785854,"version":"3.51.4"},"reference-count":57,"publisher":"Canadian Science Publishing","issue":"6","license":[{"start":{"date-parts":[[2020,11,1]],"date-time":"2020-11-01T00:00:00Z","timestamp":1604188800000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/www.nrcresearchpress.com\/page\/about\/CorporateTextAndDataMining"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["J Psychiatry Neurosci"],"published-print":{"date-parts":[[2020,11]]},"abstract":"<jats:sec><jats:title>Background:<\/jats:title><jats:p> Functional underpinnings of cognitive control deficits in unbiased samples (i.e., all comers) of patients with psychotic spectrum disorders (PSD) remain actively debated. While many studies suggest hypofrontality in the lateral prefrontal cortex (PFC) and greater deficits during proactive relative to reactive control, few have examined the full hemodynamic response. <\/jats:p><\/jats:sec><jats:sec><jats:title>Methods:<\/jats:title><jats:p> Patients with PSD ( n = 154) and healthy controls ( n = 65) performed the AX continuous performance task (AX-CPT) during rapid (460 ms) functional neuroimaging and underwent full clinical characterization. <\/jats:p><\/jats:sec><jats:sec><jats:title>Results:<\/jats:title><jats:p> Behavioural results indicated generalized cognitive deficits (slower and less accurate) across proactive and reactive control conditions in patients with PSD relative to healthy controls. We observed a delayed\/prolonged neural response in the left dorsolateral PFC, the sensorimotor cortex and the superior parietal lobe during proactive control for patients with PSD. These proactive hemodynamic abnormalities were better explained by negative rather than by positive symptoms or by traditional diagnoses according to the Diagnostic and Statistical Manual of Mental Disorders Fourth Edition, Text Revision (DSM-IV-TR), with subsequent simulations unequivocally demonstrating how these abnormalities could be erroneously interpreted as hypoactivation. Conversely, true hypoactivity, unassociated with clinical symptoms or DSM-IV-TR diagnoses, was observed within the ventrolateral PFC during reactive control. <\/jats:p><\/jats:sec><jats:sec><jats:title>Limitations:<\/jats:title><jats:p> In spite of guidance for AX-CPT use in neuroimaging studies, one-third of patients with PSD could not perform the task above chance and were more clinically impaired. <\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion:<\/jats:title><jats:p> Current findings question the utility of the AX-CPT for neuroimaging-based appraisal of cognitive control across the full spectrum of patients with PSD. Previously reported lateral PFC \u201chypoactivity\u201d during proactive control may be more indicative of a delayed\/prolonged neural response, important for rehabilitative purposes. Negative symptoms may better explain certain behavioural and hemodynamic abnormalities in patients with PSD relative to DSM-IV-TR diagnoses. <\/jats:p><\/jats:sec>","DOI":"10.1503\/jpn.190212","type":"journal-article","created":{"date-parts":[[2020,10,30]],"date-time":"2020-10-30T12:35:07Z","timestamp":1604061307000},"page":"430-440","source":"Crossref","is-referenced-by-count":9,"title":["Differing functional mechanisms underlie cognitive control deficits in psychotic spectrum disorders"],"prefix":"10.1139","volume":"45","author":[{"given":"David D.","family":"Stephenson","sequence":"first","affiliation":[{"name":"From the The Mind Research Network\/Lovelace Biomedical and Environmental Research Institute, Albuquerque, NM, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ansam A.","family":"El Shaikh","sequence":"additional","affiliation":[{"name":"From the The Mind Research Network\/Lovelace Biomedical and Environmental Research Institute, Albuquerque, NM, 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