Johanna C Badcock

Johanna C Badcock
University of Western Australia | UWA · School of Psychological Science

PhD Psychology

About

177
Publications
26,079
Reads
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Citations
Introduction
I am an experimental and clinical psychologist. My research harnesses the latest advances in psychological science to gain a better understanding of the mechanisms underpinning psychotic symptoms. My current work focuses on the role of loneliness in mental health. I am also interested in improving the skills and development of trainee psychologists as evidenced-based practitioners.
Additional affiliations
January 2021 - present
Private Business
Position
  • Consultant
January 2020 - present
Global Initiative on Loneliness and Connection
Position
  • Co-founder and Steering Committee Member (Pro Bono)
November 2019 - December 2021
University of Western Australia
Position
  • Professor (Associate)
Description
  • Supervision of higher degree research students. Collaboration on a variety of research projects on mental health and loneliness across the age span.
Education
February 1987 - February 1992
University of Melbourne
Field of study
  • Psychology
February 1985 - February 1987
University of Melbourne
Field of study
  • Clinical Psychology
September 1980 - June 1983
University of Oxford
Field of study
  • Experimental Psychology

Publications

Publications (177)
Article
Accumulating evidence shows that loneliness in psychosis is a major concern for patients, is associated with poorer mental and physical health, and is a significant barrier to recovery. Although psychologists play a major role in treating the cognitive, emotional, and social difficulties of people with psychosis, loneliness is rarely addressed. Thi...
Article
Purpose The purpose of this study was to explore the current practices and training requirements for supporting clients experiencing psychosocial concerns in the audiology setting, from the perspectives of audiology clinicians, managers, and reception staff. Method Convenience sampling was used to recruit audiologists, reception staff, and clinic...
Article
Full-text available
Objectives This systematic review aimed to quantify differences in loneliness levels between autistic and neurotypical samples and investigate the association between loneliness and mental health in autistic individuals. Methods Three meta-analyses were conducted. Studies were methodologically appraised using established tools. Results Overall, 3...
Article
Objective: People who experience distressing voices frequently report negative (e.g. abusive or threatening) voice content and this is a key driver of distress. There has also been recognition that positive (e.g. reassuring, or guiding) voice content contributes to better outcomes. Despite this, voice content has been neglected as a standalone out...
Article
Objective: The purpose of this study was to explore whether self-reported mental wellbeing (anxiety, depression and loneliness) in audiologists has changed over the course of the COVID-19 pandemic and to examine possible factors contributing to audiologists' current state of mental wellbeing.Design: Two cross-sectional surveys were distributed at t...
Article
Objectives: The detection of young people at high risk for psychotic disorders has been somewhat narrowly focused on overt symptom-based markers that reflect mild reality distortion (e.g., psychotic-like experiences), or prodromal syndromes that are proximal to psychosis onset. The concept of schizotypy represents a broader framework for investiga...
Article
Full-text available
Purpose Audiology clinical guidelines recommend the use of mental health screening tools; however, they remain underutilized in clinical practice. As such, psychological concerns are frequently undetected in adults with hearing loss. This study aimed to better understand audiology clinic staff's perspectives (including audiologists, audiometrists,...
Preprint
Age differences in the prevalence of loneliness have been a key focus among researchers, practitioners, and policy makers. However, the degree to which those reflect genuine differences in the experience of loneliness or the way individuals understand and respond to loneliness measures, is yet to be examined. The current study explored the age meas...
Article
Full-text available
Auditory verbal hallucinations, or voice hearing, is increasingly understood as a common experience. Despite this, voice hearers still experience a great deal of stigma, which can have serious negative impacts on the person's experience of their voices, and their recovery. Research has demonstrated that healthcare professionals may be a major sourc...
Article
Objective The aim of the study was to examine the mental well-being of audiologists in the midst of the COVID-19 pandemic. Design A cross-sectional online survey was conducted during the COVID-19 pandemic, between 23 June and 13 August 2020. A self-report survey included screening measures for psychological distress (PHQ-4: anxiety and depression)...
Article
Background Cognitive impairment is a key feature of psychiatric illness, making cognition an important tool for exploring of the genetics of illness risk. It remains unclear which measures should be prioritized in pleiotropy-guided research. Here, we generate profiles of genetic overlap between psychotic and affective disorders and cognitive measur...
Article
Psychological treatments for hallucinations typically target auditory verbal hallucinations (AVH) but neglect the influence of hallucinations in other sensory modalities. This study compared the baseline clinical characteristics and therapeutic outcomes (following brief Coping Strategy Enhancement) of adult clients (N = 100) with multimodal or unim...
Technical Report
Full-text available
Ending Loneliness Together in Australia is the first white paper to highlight the growing problem of loneliness in Australia and its significant impact on the social, health and economic wellbeing of the Australian community.
Article
Full-text available
Introduction the source monitoring account has been widely investigated for hallucinations in schizophrenia. According to this account, hallucinations are inner events that are misattributed to another source. Our paper investigated this account for Alzheimer’s disease. Method we investigated hallucination experiences in participants with Alzheime...
Article
Full-text available
Although anomalous perceptual experiences are common in healthy older adults, they remain poorly characterized. In particular, it is unclear whether the phenomenology of these experiences differs between healthy older and younger adults. The current study examined similarities and differences in the factor structure of the Cardiff Anomalous Percept...
Article
Objective: There is a dearth of longitudinal data on outcomes in prevalent cases of psychotic illness across a range of ages and levels of chronicity. Our aim was to describe changes over time in mental and physical health outcomes, as well as patterns of service utilisation that may have influenced outcomes, in a representative prevalence sample...
Article
Full-text available
Background: The present study reports preliminary results from the multicentre project on the approbation of the Russian language version of the "The Communication Checklist-Self Report" (RL-CC-SR) and its first use in schizophrenia (SZ), aiming to evaluate the contribution of language disturbances in the pathogenesis of this heterogeneous disorde...
Article
Full-text available
Older adults experience hallucinations in a variety of social , physical, and mental health contexts. Not everyone is open about these experiences, as hallucinations are surrounded with stigma. Hence, hallucinatory experiences in older individuals are often under-recognized. They are also commonly misunderstood by service providers, suggesting that...
Article
Background Loneliness is common in people with psychotic disorders and associated with reduced health and well-being. The relationship between loneliness in psychosis and health service use is unclear. This study examined whether loneliness predicts increased health care utilization in this population, independently of sociodemographics, health and...
Article
Full-text available
Background General population data show that cannabis use by younger people has been declining but increasing in older adults and overall, the gap between men and women appears to be narrowing. Despite rates of past-year cannabis use by people with a psychotic disorder being much higher than that of the general population, little has been documente...
Preprint
Full-text available
Background: General population data show cannabis use by younger people is declining but increasing in older adults. Overall, the gap between men and women appears to be narrowing. Little has been documented about sex and age differences in patterns of cannabis use over time by people with a psychotic disorder. We examined rates of past-year cannab...
Article
Determining reliable and clinically significant change is central to evidenced‐based practice, yet rarely used in routine clinical settings. This paper illustrates these methods in the context of an evaluation of Cognitive Behaviour Therapy for distressing auditory hallucinations (‘voices’). We used data from a clinical sample attending Perth Voice...
Book
This practical guide outlines the latest advances in understanding and treating psychotic symptoms and disorders, articulating step-by-step the clinical skills and knowledge required to effectively treat this patient population. A Clinical Introduction to Psychosis takes an evidence-based approach that encourages a wider perspective on clinical pra...
Article
Brief and single‐symptom forms of Cognitive Behaviour Therapy (CBT) for distressing voices may increase access to evidence‐based psychological therapy and transcend diagnostic barriers. The current study evaluated the “C” and “B” in CBT for distressing voices in a transdiagnostic voices clinic. The “B” module (component of therapy) sought to enhanc...
Article
Full-text available
Introduction: We investigated the relationship between visual hallucinations and vividness of visual imagery in patients with Alzheimer's disease (AD). Method: We recruited 28 patients with AD and 30 healthy control participants, matched for age and education. We evaluated proneness towards hallucinations with the Launay–Slade Hallucinations Scale,...
Article
Full-text available
Humans are highly social beings, yet people with social anhedonia experience reduced interest in or reward from social situations. Social anhedonia is a key facet of schizotypal personality, an important symptom of schizophrenia, and increasingly recognized as an important feature in a range of other psychological disorders. However, to date, there...
Article
The FOXP2 gene is hypothesised to be involved in schizophrenia by affecting speech and language development. Associations between common single nucleotide polymorphisms (SNPs) in FOXP2 and language have been inconsistent. We tested five previously associated SNPs for association with language in the Western Australian Family Study of Schizophrenia...
Article
Full-text available
Contour integration is impaired in schizophrenia patients, even at the first episode, but little is known about visual integration abilities prior to illness onset. To examine this issue, we compared undergraduate students high and low in schizotypal personality traits, reflecting putative liability to psychosis, on two psychophysical tasks assessi...
Article
Loneliness is an established risk factor for poor cardiometabolic health. People with psychotic disorders experience high rates of both cardiometabolic disease and loneliness, but how these factors are associated is poorly understood. Thus, using data from the second Australian National Survey of Psychosis we examined whether loneliness is associat...
Article
Full-text available
Objective: To investigate whether recent cannabis use by men and women with psychotic disorders was associated with increased risk of suicide attempt, and to determine associated factors, stratified by sex. Methods: Data from 1065 men and 725 women interviewed in the Australian national survey of psychosis were analysed to model separately, for...
Article
Congenital/early blindness is reportedly protective against schizophrenia. Using a whole-population cohort of 467,945 children born in Western Australia between 1980 and 2001, we examined prevalence of schizophrenia and psychotic illness in individuals with congenital/early blindness. Overall, 1870 children developed schizophrenia (0.4%) while 9120...
Article
Full-text available
Perceptual organization (PO) difficulties have repeatedly been reported in people with schizophrenia, and in healthy individuals with high levels of schizotypy traits, who are at increased risk for schizophrenia. In particular, poor performance on the Embedded Figures Test (EFT) has been interpreted as an atypically strong preference for global ove...
Article
Full-text available
Background A growing body of evidence supports the association between cannabis use and an increased risk of suicidal behaviour in the general population. However, studies that have examined the relationship between cannabis use and suicide in people with a psychotic disorder report divergent findings. Further research is needed to help clarify the...
Article
Full-text available
Background Latent liability for schizophrenia (schizotypy) is expressed in various combinations of cognitive, psychological, and behavioural characteristics evident in the general population. Historical models propose that distinct classes of individuals expressing different forms of schizotypy may represent manifestations of differential levels of...
Article
Full-text available
Elucidating schizotypal traits is important if we are to understand the various manifestations of psychosis spectrum liability and to reliably identify individuals at high risk for psychosis. The present study examined the network structures of (1) 9 schizotypal personality domains and (2) 74 individual schizotypal items, and (3) explored whether n...
Article
Background: Schizotypal traits are expressions of underlying vulnerability to psychotic disorders which have a potential impact on mental health status, neurocognition, quality of life, and daily functioning. To date, little research has examined epidemiologic landscape of schizotypal traits at the cross-national level. Our aim was to study the ex...
Article
Full-text available
Objectives: The Diagnostic Interview for Psychoses (DIP) was developed to enhance the quality of diagnostic assessment of psychotic disorders. The aim of the study was the adaptation of the Russian language version and evaluation of its validity and reliability. Material and methods: Ninety-eight patients with psychotic disorders (89 video recor...
Article
The Schizotypal Personality Questionnaire-Brief (SPQ-B) was developed with the aim of examining variations in healthy trait schizotypy, as well as latent vulnerability to psychotic-spectrum disorders. No previous study has studied the cross-cultural validity of the SPQ-B in a large cross-national sample. The main goal of the present study was to an...
Article
Phenotypic heterogeneity is a major barrier to understanding the genetic architecture underlying schizophrenia. Incorporating endophenotypes is one way to reduce heterogeneity and facilitate more powerful genetic analysis. Candidate endophenotypes require systematic assessment against endophenotype criteria, and a ranking of their potential utility...
Article
Background: Schizotypal traits are considered a phenotypic-indicator of schizotypy, a latent personality organization reflecting a putative liability for psychosis. To date, no previous study has examined the comparability of factorial structures across samples originating from different countries and cultures. The main goal was to evaluate the fa...
Article
Full-text available
Hallucinations, though common in youth and younger adults, are not the preserve of these age groups. Accumulating evidence shows that hallucinatory experiences are also present at surprisingly high rates in healthy older adults in the general community. Furthermore, stigma and misunderstanding of hallucinations, together with ageism, may lead to un...
Article
Cognitive impairment is a core feature of schizophrenia and impacts negatively the functioning of affected individuals. Cognitive decline correlates with aging, and is the primary cause of loss of independence and reduced quality of life. The klotho gene is a key modulator of aging, with expression deficiency resulting in premature aging, while ove...
Article
Deficits in action (verb) fluency have previously been reported in schizophrenia spectrum disorders. The degree to which this reflects difficulties generating verbs in different semantic categories is unknown. Here, action fluency responses of 46 patients with schizophrenia spectrum disorders and 76 healthy controls were classified as action or men...
Article
Background: Despite growing research, it remains unclear if cannabis use is associated with additive cognitive impairment in people with psychotic illness and whether exposure in early adolescence is associated with poorer cognitive performance in adulthood. Methods: This cross-sectional study of a nationally representative sample of 1199 adults...
Article
Background: Despite growing interest in the effects cannabis use has on cognitive function in people with psychotic illness, it still remains unclear whether cannabis use is associated with impaired cognitive function. Methods: Using data from a large nationally representative sample of adults with psychotic illness, we used a speed of processing t...
Article
Full-text available
We used Bayesian cognitive modelling to identify the underlying causes of apparent inhibitory deficits in the stop-signal paradigm. The analysis was applied to stop-signal data reported by Badcock et al. (2002) and Hughes et al. (2012), where schizophrenia patients and control participants made rapid choice responses, but on some trials were signal...
Article
Background Schizophrenia (SZ) is a clinically heterogeneous disorder with multifactorial causes including a significant genetic contribution. Recent, large scale GWAS have described a polygenic risk score (PRS) for SZ which accounts for ~ 7% of variation on the liability scale (Bulik-Sullivan et al, 2015). The aim of this study was to ascertain whe...
Article
Objective: The objective is to summarise recent findings from the 2010 Australian Survey of High Impact Psychosis (SHIP) and examine their implications for future policy and planning to improve mental health, physical health and other circumstances of people with a psychotic disorder. Methods: Survey of High Impact Psychosis collected nationally...
Article
The exome array assays rare-but-recurrent, likely deleterious, exonic variants and represents an intermediary between single nucleotide polymorphism (SNP) arrays and sequencing for genetic association studies. Multiplex families with multiple affected individuals may be enriched for disease-associated variants of this class compared to unrelated po...
Article
Full-text available
Loneliness is common in youth and associated with a significantly increased risk of psychological disorders. Although loneliness is strongly associated with psychosis, its relationship with psychosis proneness is unclear. Our aim in this paper was to test the hypothesis that loneliness and schizotypal traits, conveying risk for schizophrenia spectr...
Article
Radial Frequency (RF) patterns are a useful stimulus for assessing sensitivity to changes in shape. With these patterns it is possible to separate sensitivity to local curvature information from the ability to globally integrate information around the contour. Previous work has demonstrated that young, school-age children are less sensitive to defo...