You will be shown an abstract from a biomedical research paper. Given this abstract, your task is to extract all unique entities of the following types: ["Outcome", "Participant", "Intervention"].

Please return the output as a JSON object of the format: {"Participant" : ["patients with COPD", ...], "Intervention" : ["Atenolol", ...], "Outcome" : ["blood pressure", ...]}. The keys should be entity types and values should be lists of extracted entities belonging to the corresponding type. If you cannot find entities belonging to a specific type, the value should be [].

Only output the JSON object and do not include any additional text.

Abstract:

Duration of untreated negative and positive symptoms of psychosis and cognitive impairment in first episode psychosis . BACKGROUND Duration of untreated psychosis ( DUP ) has been significantly associated with poor clinical and social outcomes in First Episode Psychosis ( FEP ) patients , but an association with cognitive outcomes has not been clearly established . METHOD Seventy-seven consecutively admitted , drug-naïve patients with FEP were assessed at baseline and at 1month and 6months . Underlying dimensions of DUP ( general prodrome and positive , negative and disorganisation symptoms ) were assessed using the Symptom Onset in Schizophrenia ( SOS ) inventory ( Perkins et al. , 2000 ) . To assess the effect of DUP on the neuropsychological status of the patients , a linear mixed-effect model was fitted to each neuropsychological dimension . These models included a dichotomised version of DUP ( short versus long duration ) as a fixed effect , several adjusting variables to account for patient differences , and a random effect to incorporate the longitudinal structure of the data . RESULTS Patients with a short duration of untreated negative symptoms ( DUNS ) or a short duration of untreated positive symptoms ( DUPS ) outperformed patients with a long duration of untreated symptoms on memory tasks and a pre-attentional visual task but not on measures of verbal fluency , attention , reaction time , visual processing and executive functions . CONCLUSIONS This study provides additional support for an early intervention to shorten DUP to facilitate a better outcome in memory and attentional domains of FEP patients .
{"Intervention": ["verbal fluency , attention , reaction time , visual processing and executive functions"], "Outcome": ["poor clinical and social outcomes"], "Participant": ["Seventy-seven", "psychosis", "first episode psychosis"]}