Watson, Andrew James;
(2020)
Cognition in first-episode psychosis: Characterisation, reserve and relationship to functioning.
Doctoral thesis (Ph.D), UCL (University College London).
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Abstract
Schizophrenia is marked by deficits in cognition and social functioning that present early in the course of illness. A relationship between neurocognitive impairment (e.g. memory and processing speed), and social functioning is reported in the literature, with poorer neurocognition associated with worse social outcomes. There is emerging evidence for the existence of neurocognitive subtypes with different cognitive trajectories, hypothesised to reflect separate etiological processes and risk factors for clinical and social outcomes. Despite neurocognition being considered one of the best predictors of social outcomes, there is still a large amount of variance in outcomes left unexplained. In addition to neurocognitive deficits, processes required for successful social interactions, collectively known as ‘social cognition’ i.e. theory of mind, attribution bias, social perception and emotion perception, have been shown to be impaired in those with established schizophrenia. There is some evidence that social cognition mediates the relationship between neurocognition and functional outcomes. Studying individuals with a first-episode psychosis (FEP) allows the examination of the fundamental features of schizophrenia, without the confounding effects of prolonged medication, hospitalisation and social isolation. Using two clinical-trial FEP groups, the studies presented in this thesis examined: the existence and magnitude of global and domain-specific neuro- and social cognitive impairment; the existence of neurocognitive-trajectory based subtypes and their brain volumetric and inflammatory profiles; the relationship between neurocognition and social functioning; and whether social cognition mediates the relationship between neurocognition and social functioning. Three IQ-trajectory based subtypes that were stable over time and distinguished by biological underpinnings were found. Social cognition deficits were present early in the course of illness and significantly overlapped with neurocognitive impairments, but it could not be concluded that social cognition mediates the relationship between neurocognition and social functioning. The results of the studies enabled recommendations for remedial strategies to improve social functioning and quality of life of individuals early in the course of illness.
| Type: | Thesis (Doctoral) |
|---|---|
| Qualification: | Ph.D |
| Title: | Cognition in first-episode psychosis: Characterisation, reserve and relationship to functioning |
| Event: | UCL (University College London) |
| Open access status: | An open access version is available from UCL Discovery |
| Language: | English |
| Additional information: | Copyright © The Author 2020. Original content in this thesis is licensed under the terms of the Creative Commons Attribution 4.0 International (CC BY 4.0) Licence (https://creativecommons.org/licenses/by/4.0/). Any third-party copyright material present remains the property of its respective owner(s) and is licensed under its existing terms. Access may initially be restricted at the author’s request. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > UCL Queen Square Institute of Neurology |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10095684 |
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