Table 1.

Systematic search strategy.

Database	Search Syntax	Number of Retrieved Documents	Date of Search
PubMed	(EEG OR electroencephalography OR qEEG OR “quantitative EEG” OR “EEG microstate” OR “dipole source localization” OR sLORETA OR LORETA OR eLORETA OR ERP OR “event-related potential” OR “spectral analysis” OR “frequency domain analysis” OR “spectral band” OR “neural oscillations” OR “spectral power” OR “event-related” OR “evoked potential” OR “evoked-response”) AND (psychosis OR schizophrenia OR schizoaffective OR “first-episode psychosis” OR FEP OR “Ultra-High Risk” OR UHR OR Clinical High Risk OR CHR) AND (neurocognit* OR cognit* OR memory OR “verbal learning” OR “verbal memory” OR “visual learning” OR “visual memory” OR “visual-spatial learning” OR “visual-spatial memory” OR “working memory” OR attention OR vigilance OR “processing speed” OR “speed of processing” OR reasoning OR “problem solving” OR “Verbal executive function” OR “Cognitive flexibility” OR “Executive function*” OR Insight OR “Cognitive Perseveration” OR “Decision-making” OR Planning OR “Executive control” OR metacognit* OR Perseveration OR “error awareness” OR “error control” OR “error monitoring”)	1733	2 November 2021
Scopus	(EEG OR electroencephalography OR qEEG OR “quantitative EEG” OR “EEG microstate” OR “dipole source localization” OR sLORETA OR LORETA OR eLORETA OR ERP OR “event-related potential” OR “spectral analysis” OR “frequency domain analysis” OR “spectral band” OR “neural oscillations” OR “spectral power” OR “event-related” OR “evoked potential” OR “evoked-response”) AND (psychosis OR schizophrenia OR schizoaffective OR “first-episode psychosis” OR FEP OR “Ultra-High Risk” OR UHR OR Clinical High Risk OR CHR) AND (neurocognit* OR cognit* OR memory OR “verbal learning” OR “verbal memory” OR “visual learning” OR “visual memory” OR “visual-spatial learning” OR “visual-spatial memory” OR “working memory” OR attention OR vigilance OR “processing speed” OR “speed of processing” OR reasoning OR “problem solving” OR “Verbal executive function” OR “Cognitive flexibility” OR “Executive function*” OR Insight OR “Cognitive Perseveration” OR “Decision-making” OR Planning OR “Executive control” OR metacognit* OR Perseveration OR “error awareness” OR “error control” OR “error monitoring”)	460	2 November 2021
PsychINFO	(EEG OR electroencephalography OR qEEG OR “quantitative EEG” OR “EEG microstate” OR “dipole source localization” OR sLORETA OR LORETA OR eLORETA OR ERP OR “event-related potential” OR “spectral analysis” OR “frequency domain analysis” OR “spectral band” OR “neural oscillations” OR “spectral power” OR “event-related” OR “evoked potential” OR “evoked-response”) AND (psychosis OR schizophrenia OR schizoaffective OR “first-episode psychosis” OR FEP OR “Ultra-High Risk” OR UHR OR Clinical High Risk OR CHR) AND (neurocognit* OR cognit* OR memory OR “verbal learning” OR “verbal memory” OR “visual learning” OR “visual memory” OR “visual-spatial learning” OR “visual-spatial memory” OR “working memory” OR attention OR vigilance OR “processing speed” OR “speed of processing” OR reasoning OR “problem solving” OR “Verbal executive function” OR “Cognitive flexibility” OR “Executive function*” OR Insight OR “Cognitive Perseveration” OR “Decision-making” OR Planning OR “Executive control” OR metacognit* OR Perseveration OR “error awareness” OR “error control” OR "error monitoring”)	1357	2 November 2021