mental 4dScientific Background. The Covid-19 crisis has brought the mental health needs of the population into greater awareness. In particular, the effects of lockdown on employment,Evaluation of 4D's. 18 terms. zephanb17. Preview. Schizophrenia - Research. 42 terms. travismosscoleman. Preview. Terms in this set (9) 4 D's. deviance, distress, dysfunction,