Papers by Philippa Garety
Psychological Medicine, 2012
Background. Psychological models of psychosis were examined using Experience Sampling Methods (ES... more Background. Psychological models of psychosis were examined using Experience Sampling Methods (ESM) to explore relationships between dimensions and appraisals of key symptoms and affect.
Behaviour Research and Therapy, 2006
Background: this study explored the longitudinal course of the relationship between delusions and... more Background: this study explored the longitudinal course of the relationship between delusions and different aspects of cognitive functioning.
Schizophrenia Research, 1996
The original 40-item PDI was designed to measure delusional ideation in the normal population, us... more The original 40-item PDI was designed to measure delusional ideation in the normal population, using the PSE as a template. The multidimensionality of delusions was incorporated by including measures of distress, preoccupation and conviction. Good psychometric properties were reported on a sample of
Psychological Medicine, 2007
Background. Cognitive models of the positive symptoms of psychosis specify the cognitive, social ... more Background. Cognitive models of the positive symptoms of psychosis specify the cognitive, social and emotional processes hypothesized to contribute to their occurrence and persistence, and propose that vulnerable individuals make characteristic appraisals that result in specific positive symptoms.
Quarterly Journal of Experimental Psychology Section A-human Experimental Psychology, 2000
One account of generalized anxiety disorder (GAD) is that it results from hypervigilance, manifes... more One account of generalized anxiety disorder (GAD) is that it results from hypervigilance, manifest as excessive scanning of the external environment and preferential attention to threat. However, for individuals with GAD, there has been no direct study of scanning, and evidence for preferential attention to threat has only been found for threat-words. We therefore devised a new measure of hypervigilance. Visual scan paths were recorded of individuals with GAD (N = 12) and people without a psychiatric illness (N = 12) viewing complex pictures that varied in threat content. People with persecutory beliefs (N = 11) also participated in the study to test the hypothesis that anxiety, via such hypervigilant cognitive processes, may contribute to the maintenance of delusions. Compared with the control group, the anxious individuals were not found either to scan excessively for or to look at threat. The anxiety group was therefore not hypervigilant for external threat, which is inconsistent with the hypervigilance model. As a consequence, the hypothesis that anxiety maintains delusions was not tested. However, additional support was found for the hypothesis that people with delusions form rapid judgements on the basis of less data-gathering than control groups who are either anxious or have no psychiatric illness.
High expressed emotion in carers predicts relapse in psychosis, but it is not known why this is s... more High expressed emotion in carers predicts relapse in psychosis, but it is not known why this is so. In our cognitive model of psychosis, we postulated that the effect is mediated through affective changes. To investigate the relationships between carer expressed emotion, patients' symptoms and carer characteristics during a recent relapse of psychosis. A total of 86 patients and carers were investigated in a cross-sectional design. Patients whose carers showed high expressed emotion had significantly higher levels of anxiety and depression, but not more psychotic symptoms or lower self-esteem. Linear regression showed that carers'critical comments predicted anxiety in patients. Critical comments were related to low carer self-esteem and avoidant coping strategies. Low carer self-esteem was also related to carer depression, stress and carer 'burden', and to low patient self-esteem. Our hypothesis was partially supported. Carer criticism was associated with patient anxiety, low carer self-esteem and poor carer coping strategies. Family interventions should focus on improving these after a relapse of symptoms of psychosis.
Schizophrenia Research, 2003
Lack of judgement and insight and stereotyped thinking were positively related to instrumental ro... more Lack of judgement and insight and stereotyped thinking were positively related to instrumental role factors (r=0.37, r=0.41, respectively; p-< 0.05) and to affiliative role factors (r=0.49, r=0.50, respectively; p-0.01). This study suggests moderately strong positive links between certain cognitive symptoms and poorer social functioning. Thus, cognitive functioning should be addressed in social rehabilitation programs. Also, improving cognitive functioning by medication is likely to improve social skills.
The Australian and New Zealand journal of psychiatry, 2014
The psychological flexibility model has been hypothesized as a transdiagnostic, process-oriented ... more The psychological flexibility model has been hypothesized as a transdiagnostic, process-oriented approach to understanding various clinical disorders and problems, including chronic pain, anxiety, and substance misuse. In this study we investigated the model's applicability to the experience of hearing distressing voices. Fifty people experiencing persisting auditory hallucinations were administered the Kentucky Inventory of Mindfulness Skills, Acceptance and Action Questionnaire, Beliefs about Voices Questionnaire-Revised, Thought Control Questionnaire, and the Beck Anxiety and Depression Inventories. We predicted that psychological flexibility, mindful action, and nonjudgemental acceptance would be negatively associated with distress, disability, and behavioural responses to voice hearing and would have additional explanatory power when included with appraisals of voices and thought-control strategies (as predicted by cognitive models of auditory hallucinations). The results s...
Journal of behavior therapy and experimental psychiatry, Jan 24, 2015
Delusional beliefs with persecutory content are common in psychosis, but difficult to treat. Inte... more Delusional beliefs with persecutory content are common in psychosis, but difficult to treat. Interventions targeting hypothesised causal and maintaining factors have been proposed as a way of improving therapy. The current study is a feasibility randomised controlled trial of the 'Thinking Well (TW)' intervention: This novel approach combines the recently developed Maudsley Review Training Programme (MRTP), with additional, focussed cognitive-behavioural therapy sessions. 31 participants with distressing persecutory delusions and schizophrenia spectrum disorders were randomised to TW or to treatment as usual in a 2:1 ratio. Participants completed outcome assessments at 0 (baseline), 1 (post-MRTP), 6 (post-TW) and 8 (follow-up) weeks. Key outcomes included belief flexibility, paranoia, and delusional conviction and distress. Participants allocated to TW completed the MRTP package and four CBT sessions with a clinical psychologist. Recruitment proved feasible. Participants rep...
Schizophrenia research, 2008
Epidemiological studies have found that individuals who live in urban areas are at increased risk... more Epidemiological studies have found that individuals who live in urban areas are at increased risk of developing psychosis. However it is unknown whether exposure to urban environments exacerbates psychotic symptoms in people who have a diagnosed psychotic disorder. The aim of the study was to examine the psychological and clinical effects of exposure to one specific deprived urban environment on individuals with persecutory delusions. It was predicted that the urban environment would affect emotional and reasoning processes highlighted in a cognitive model of persecutory delusions and would increase paranoia. Thirty patients with persecutory delusions were randomised to exposure to a deprived urban environment or to a brief mindfulness relaxation task. After exposure, assessments of symptoms, reasoning, and affective processes were taken. Thirty matched non-clinical participants also completed the study measures to enable interpretation of the test scores. In individuals with persec...
Behavioural and cognitive psychotherapy, 2015
Substantial epidemiological research has shown that psychotic experiences are more common in dens... more Substantial epidemiological research has shown that psychotic experiences are more common in densely populated areas. Many patients with persecutory delusions find it difficult to enter busy social urban settings. The stress and anxiety caused by being outside lead many patients to remain in-doors. We therefore developed a brief CBT intervention, based upon a formulation of the way urban environments cause stress and anxiety, to help patients with paranoid thoughts to feel less distressed when outside in busy streets. The aim was to pilot the new intervention for feasibility and acceptability and gather preliminary outcome data. Fifteen patients with persecutory delusions in the context of a schizophrenia diagnosis took part. All patients first went outside to test their reactions, received the intervention, and then went outside again. The intervention was considered useful by the patients. There was evidence that going outside after the intervention led to less paranoid responses ...
Canadian journal of psychiatry. Revue canadienne de psychiatrie, 2014
Aggressive behaviour in psychosis is not uncommon. Community provision for people with psychosis ... more Aggressive behaviour in psychosis is not uncommon. Community provision for people with psychosis has left informal caregivers to take on a greater role in their care. However, few studies have explored links between patient-initiated violence in mental health caregiving relationships and caregiver functioning. Our study investigated caregiver reports of aggressive acts committed by their relative with psychosis and their links to caregiver appraisals of the caregiving relationship and caregiver outcomes. Caregivers of patients with a recent relapse of psychosis, recruited to a psychological therapy trial, completed the audiotaped Camberwell Family Interview at baseline. This semi-structured interview includes questions on the quality of the relationship between caregiver and patient, and patient history of violence. Seventy-two transcripts of interviews were assessed for reports of patient-initiated violence. One-half of the caregiver sample (52.9%) reported an incident of patient-i...
Behaviour Research and Therapy, 2015
Despite its demonstrated clinical and economic effectiveness, access to Cognitive Behavioural The... more Despite its demonstrated clinical and economic effectiveness, access to Cognitive Behavioural Therapy for psychosis (CBTp) in routine practice remains low. The UK National Health Service (NHS England) Improving Access to Psychological Therapies for people with Severe Mental Illness (IAPT-SMI) initiative aims to address this problem. We report 14-month outcomes for our psychosis demonstration site. Primary and secondary care and self-referrals were screened to check the suitability of the service for the person. Psychotic symptoms, distress, service use, functioning and satisfaction were measured before and after therapy, by trained assessors. User-defined wellbeing and goal-attainment were rated sessionally.
The Journal of Nervous and Mental Disease, 2014
High expressed emotion (EE) is a robust predictor of elevated rates of relapse and readmission in... more High expressed emotion (EE) is a robust predictor of elevated rates of relapse and readmission in schizophrenia. However, far less is known about how high EE leads to poorer patient outcomes. This study was designed to examine links between high EE (criticism), affect, and multidimensional aspects of positive symptoms in patients with psychosis. Thirty-eight individuals with nonaffective psychosis were randomly exposed to proxy high-EE or neutral speech samples and completed self-report measures of affect and psychosis symptoms. Patients reported significant increases in anxiety, anger, and distress after exposure to the proxy high-EE speech sample as well as increases in their appraisals of psychosis symptoms: voice controllability, delusional preoccupation, and conviction. These findings offer further evidence of the potential deleterious impact of a negative interpersonal environment on patient symptoms in psychosis.
A series of small, mainly uncontrolled, studies have suggested that techniques adapted from cogni... more A series of small, mainly uncontrolled, studies have suggested that techniques adapted from cognitive-behavioural therapy (CBT) for depression can improve outcome in psychosis, but no large randomised controlled trial of intensive treatment for medication-resistant symptoms of psychosis has previously been published. Sixty participants who each had at least one positive and distressing symptom of psychosis that was medication-resistant were randomly allocated between a CBT and standard care condition (n = 28) and a standard care only control condition (n = 32). Therapy was individualised, and lasted for nine months. Multiple assessments of outcome were used. Over nine months, improvement was significant only in the treatment group, who showed a 25% reduction on the BPRS. No other clinical, symptomatic or functioning measure changed significantly. Participants had a low drop-out rate from therapy (11%), and expressed high levels of satisfaction with treatment (80%). Fifty per cent of the CBT group were treatment responders (one person became worse), compared with 31% of the control group (three people became worse and another committed suicide). CBT for psychosis can improve overall symptomatology. The findings provide evidence that even a refractory group of clients with a long history of psychosis can engage in talking about psychotic symptoms and their meaning, and this can improve outcome.
Schizophrenia Research, 2006
Psychiatry Research, 2014
Understanding how people with delusions arrive at false conclusions is central to the refinement ... more Understanding how people with delusions arrive at false conclusions is central to the refinement of cognitive behavioural interventions. Making hasty decisions based on limited data (&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;#39;jumping to conclusions&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;#39;, JTC) is one potential causal mechanism, but reasoning errors may also result from other processes. In this study, we investigated the correlates of reasoning errors under differing task conditions in 204 participants with schizophrenia spectrum psychosis who completed three probabilistic reasoning tasks. Psychotic symptoms, affect, and IQ were also evaluated. We found that hasty decision makers were more likely to draw false conclusions, but only 37% of their reasoning errors were consistent with the limited data they had gathered. The remainder directly contradicted all the presented evidence. Reasoning errors showed task-dependent associations with IQ, affect, and psychotic symptoms. We conclude that limited data-gathering contributes to false conclusions but is not the only mechanism involved. Delusions may also be maintained by a tendency to disregard evidence. Low IQ and emotional biases may contribute to reasoning errors in more complex situations. Cognitive strategies to reduce reasoning errors should therefore extend beyond encouragement to gather more data, and incorporate interventions focused directly on these difficulties.
Schizophrenia bulletin, Jan 20, 2014
For many patients with persecutory delusions, leaving home and going into crowded streets is a ke... more For many patients with persecutory delusions, leaving home and going into crowded streets is a key clinical problem. In this study we aimed to inform treatment development by determining the psychological mechanisms whereby busy urban environments increase paranoia. In a randomized design with prespecified mediation analysis, we compared the effects on patients of going outside into a busy social environment with staying inside. Fifty-nine patients with current persecutory delusions, in the context of nonaffective psychosis, reporting fears when going outside were assessed on factors from a cognitive model of paranoia. They were then randomized either to enter a busy local shopping street or to complete a neutral task indoors. They were then reassessed on the measures. Compared with staying inside, the street exposure condition resulted in significant increases in paranoia, voices, anxiety, negative beliefs about the self, and negative beliefs about others. There was also a decrease...
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Papers by Philippa Garety