23 results on '"Mason, Liam"'
Search Results
2. A randomized controlled trial to compare the effects of time-restricted eating versus Mediterranean diet on symptoms and quality of life in bipolar disorder
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Johnson, Sheri L., Murray, Greg, Kriegsfeld, Lance J., Manoogian, Emily N.C., Mason, Liam, Allen, J. D., Berk, Michael, Panda, Satchidanda, Rajgopal, Nandini A., Gibson, Jake C., Joyner, Keanan J., Villanueva, Robert, and Michalak, Erin E.
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- 2024
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3. Misperceiving Momentum: Computational Mechanisms of Biased Striatal Reward Prediction Errors in Bipolar Disorder
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Moningka, Hestia and Mason, Liam
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- 2024
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4. Self-esteem depends on beliefs about the rate of change of social approval
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Low, Alexis An Yee, Hopper, William John Telesfor, Angelescu, Ilinca, Mason, Liam, Will, Geert-Jan, and Moutoussis, Michael
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- 2022
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5. Measurement invariance of the Patient Health Questionnaire (PHQ-9) and Generalized Anxiety Disorder scale (GAD-7) across four European countries during the COVID-19 pandemic
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Shevlin, Mark, Butter, Sarah, McBride, Orla, Murphy, Jamie, Gibson-Miller, Jilly, Hartman, Todd K., Levita, Liat, Mason, Liam, Martinez, Anton P., McKay, Ryan, Stocks, Thomas VA, Bennett, Kate M, Hyland, Philip, Vallieres, Frédérique, Valiente, Carmen, Vazquez, Carmelo, Contreras, Alba, Peinado, Vanesa, Trucharte, Almudena, Bertamini, Marco, Panzeri, Anna, Bruno, Giovanni, Granziol, Umberto, Mignemi, Giuseppe, Spoto, Andrea, Vidotto, Giulio, and Bentall, Richard P.
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- 2022
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6. Networks underpinning emotion: A systematic review and synthesis of functional and effective connectivity
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Underwood, Raphael, Tolmeijer, Eva, Wibroe, Johannes, Peters, Emmanuelle, and Mason, Liam
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- 2021
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7. Delay discounting and under-valuing of recent information predict poorer adherence to social distancing measures during the COVID-19 pandemic
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Lloyd, Alex, McKay, Ryan, Hartman, Todd K., Vincent, Benjamin T., Murphy, Jamie, Gibson-Miller, Jilly, Levita, Liat, Bennett, Kate, McBride, Orla, Martinez, Anton P., Stocks, Thomas V. A., Vallières, Frédérique, Hyland, Philip, Karatzias, Thanos, Butter, Sarah, Shevlin, Mark, Bentall, Richard P., and Mason, Liam
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- 2021
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8. You read my mind: fMRI markers of threatening appraisals in people with persistent psychotic experiences
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Underwood, Raphael, Mason, Liam, O’Daly, Owen, Dalton, Jeffrey, Simmons, Andrew, Barker, Gareth J., Peters, Emmanuelle, and Kumari, Veena
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- 2021
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9. Psychological characteristics associated with COVID-19 vaccine hesitancy and resistance in Ireland and the United Kingdom
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Murphy, Jamie, Vallières, Frédérique, Bentall, Richard P., Shevlin, Mark, McBride, Orla, Hartman, Todd K., McKay, Ryan, Bennett, Kate, Mason, Liam, Gibson-Miller, Jilly, Levita, Liat, Martinez, Anton P., Stocks, Thomas V. A., Karatzias, Thanos, and Hyland, Philip
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- 2021
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10. An 18‐month follow‐up of the Covid‐19 psychology research consortium study panel: Survey design and fieldwork procedures for Wave 6.
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McBride, Orla, Butter, Sarah, Martinez, Anton P., Shevlin, Mark, Murphy, Jamie, Hartman, Todd K., McKay, Ryan, Hyland, Philip, Bennett, Kate M., Stocks, Thomas V. A., Gibson‐Miller, Jilly, Levita, Liat, Mason, Liam, and Bentall, Richard P.
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PSYCHOLOGICAL research ,CONSORTIA ,MENTAL illness ,INCOME ,POLITICAL attitudes - Abstract
Objectives: Established in March 2020, the C19PRC Study monitors the psychological and socio‐economic impact of the pandemic in the UK and other countries. This paper describes the protocol for Wave 6 (August–September 2021). Methods: The survey assessed: COVID‐19 related experiences; experiences of common mental health disorders; psychological characteristics; and social and political attitudes. Adult participants from any previous wave (N = 3170) were re‐invited, and sample replenishment procedures helped manage attrition. Weights were calculated using a survey raking algorithm to ensure the on‐going original panel (from baseline) was nationally representative in terms of gender, age, and household income, amongst other factors. Results: 1643 adults were re‐interviewed at Wave 6 (51.8% retention rate). Non‐participation was higher younger adults, those born outside UK, and adults living in cities. Of the adults recruited at baseline, 54.3% (N = 1100) participated in Wave 6. New respondent (N = 415) entered the panel at this wave, resulting in cross‐sectional sample for Wave 6 of 2058 adults. The raking procedure re‐balanced the longitudinal panel to within 1.3% of population estimates for selected socio‐demographic characteristics. Conclusions: This paper outlines the growing strength of the publicly available C19PRC Study data for COVID‐19‐related interdisciplinary research. [ABSTRACT FROM AUTHOR]
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- 2023
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11. Predicting resilience during the COVID-19 Pandemic in the United Kingdom: Cross-sectional and longitudinal results.
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Bennett, Kate M., Panzeri, Anna, Derrer-Merk, Elfriede, Butter, Sarah, Hartman, Todd K., Mason, Liam, McBride, Orla, Murphy, Jamie, Shevlin, Mark, Gibson-Miller, Jilly, Levita, Liat, Martinez, Anton P., McKay, Ryan, Lloyd, Alex, Stocks, Thomas V. A., Bottesi, Gioa, Vidotto, Giulo, Bentall, Richard P., and Bertamini, Marco
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COVID-19 pandemic ,PSYCHOLOGICAL research ,PSYCHOLOGICAL factors ,ECOLOGICAL resilience ,PSYCHOLOGICAL resilience ,DISASTER resilience - Abstract
Although the COVID-19 pandemic has impacted the psychological wellbeing of some people, there is evidence that many have been much less affected. The Ecological Model of Resilience (EMR) may explain why some individuals are not resilient whilst others are. In this study we test the EMR in a comparison of UK survey data collected from the COVID-19 Psychological Research Consortium (C19PRC) longitudinal study of a representative sample of the United Kingdom (UK) adult population and data from an Italian arm of the study. We first compare data from the third wave of the UK arm of the study, collected in July/August 2020, with data from an equivalent sample and stage of the pandemic in Italy in July 2020. Next, using UK longitudinal data collected from C19PRC Waves 1, 3 and 5, collected between March 2020 and April 2021 we identify the proportion of people who were resilient. Finally, we examine which factors, drawn from the EMR, predict resilient and non-resilient outcomes. We find that the 72% of the UK sample was resilient, in line with the Italian study. In the cross-sectional logistic regression model, age and self-esteem were significantly associated with resilience whilst death anxiety thoughts, neuroticism, loneliness, and Post Traumatic Stress Disorder (PTSD) symptoms related to COVID-19 were significantly associated with Non-Resilient outcomes. In the longitudinal UK analysis, at Wave 5, 80% of the sample was Resilient. Service use, belonging to wider neighbourhood, self-rated health, self-esteem, openness, and externally generated death anxiety were associated with Resilient outcomes. In contrast, PTSD symptoms and loneliness were associated with Non-Resilient outcomes. The EMR effectively explained the results. There were some variables which are amenable to intervention which could increase resilience in the face of similar future challenges. [ABSTRACT FROM AUTHOR]
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- 2023
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12. Tracking the psychological and socio‐economic impact of the COVID‐19 pandemic in the UK: A methodological report from Wave 5 of the COVID‐19 Psychological Research Consortium (C19PRC) Study.
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McBride, Orla, Butter, Sarah, Murphy, Jamie, Hartman, Todd K., McKay, Ryan, Hyland, Philip, Shevlin, Mark, Bennett, Kate M., Stocks, Thomas V. A., Lloyd, Alex, Gibson‐Miller, Jilly, Levita, Liat, Mason, Liam, Martinez, Anton P., Vallières, Frédérique, Karatzias, Thanos, and Bentall, Richard P.
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COVID-19 pandemic ,PSYCHOLOGICAL research ,PSYCHOLOGICAL factors ,CONSORTIA ,MENTAL health services - Abstract
Objectives: The COVID‐19 Psychological Research Consortium (C19PRC) Study was established in March 2020 to monitor the psychological and socio‐economic impact of the pandemic in the UK and other countries. This paper describes the protocol for Wave 5 (March–April 2021). Methods: The survey assessed: COVID‐19 related experiences; experiences of common mental health disorders; psychological characteristics; and social and political attitudes. Adults who participated in any previous wave (N = 4949) were re‐invited to participate. Weights were calculated using a survey raking algorithm to ensure the longitudinal panel was nationally representative in terms of gender, age, and household income, amongst other factors. Results: Overall, 2520 adults participated. A total of 2377 adults who participated in the previous survey wave (November–December 2020) were re‐interviewed at Wave 5 (61.5% retention rate). Attrition between these two waves was predicted by younger age, lower household income, children living in the household, and treatment for mental health difficulties. Of the adults recruited into the C19PRC study at baseline, 57.4% (N = 1162) participated in Wave 5. The raking procedure re‐balanced the longitudinal panel to within 1.5% of population estimates for selected socio‐demographic characteristics. Conclusion: This paper outlines the growing strength of the publicly available C19PRC Study data for COVID‐19‐related interdisciplinary research. [ABSTRACT FROM AUTHOR]
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- 2022
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13. Decision-making and trait impulsivity in bipolar disorder are associated with reduced prefrontal regulation of striatal reward valuation
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Mason, Liam, O’Sullivan, Noreen, Montaldi, Daniela, Bentall, Richard P., and El-Deredy, Wael
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- 2014
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14. Testing both affordability-availability and psychological-coping mechanisms underlying changes in alcohol use during the COVID-19 pandemic.
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McBride, Orla, Bunting, Eimhear, Harkin, Oisín, Butter, Sarah, Shevlin, Mark, Murphy, Jamie, Mason, Liam, Hartman, Todd K., McKay, Ryan, Hyland, Philip, Levita, Liat, Bennett, Kate M., Stocks, Thomas V. A., Gibson-Miller, Jilly, Martinez, Anton P., Vallières, Frédérique, and Bentall, Richard P.
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BEVERAGES ,COVID-19 pandemic ,ALCOHOL drinking ,ALCOHOL ,POST-traumatic stress ,STRUCTURAL equation modeling ,DISPOSABLE income - Abstract
Two theoretical perspectives have been proffered to explain changes in alcohol use during the pandemic: the 'affordability-availability' mechanism (i.e., drinking decreases due to changes in physical availability and/or reduced disposable income) and the 'psychological-coping' mechanism (i.e., drinking increases as adults attempt to cope with pandemic-related distress). We tested these alternative perspectives via longitudinal analyses of the COVID-19 Psychological Consortium (C19PRC) Study data (spanning three timepoints during March to July 2020). Respondents provided data on psychological measures (e.g., anxiety, depression, posttraumatic stress, paranoia, extraversion, neuroticism, death anxiety, COVID-19 anxiety, intolerance of uncertainty, resilience), changes in socio-economic circumstances (e.g., income loss, reduced working hours), drinking motives, solitary drinking, and 'at-risk' drinking (assessed using a modified version of the AUDIT-C). Structural equation modelling was used to determine (i) whether 'at-risk' drinking during the pandemic differed from that recalled before the pandemic, (ii) dimensions of drinking motives and the psychosocial correlates of these dimensions, (iii) if increased alcohol consumption was predicted by drinking motives, solitary drinking, and socio-economic changes. The proportion of adults who recalled engaging in 'at-risk' drinking decreased significantly from 35.9% pre-pandemic to 32.0% during the pandemic. Drinking to cope was uniquely predicted by experiences of anxiety and/or depression and low resilience levels. Income loss or reduced working hours were not associated with coping, social enhancement, or conformity drinking motives, nor changes in drinking during lockdown. In the earliest stage of the pandemic, psychological-coping mechanisms may have been a stronger driver to changes in adults' alcohol use than 'affordability-availability' alone. [ABSTRACT FROM AUTHOR]
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- 2022
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15. Design, content, and fieldwork procedures of the COVID‐19 Psychological Research Consortium (C19PRC) Study – Wave 4.
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McBride, Orla, Butter, Sarah, Murphy, Jamie, Shevlin, Mark, Hartman, Todd K., Bennett, Kate M., Stocks, Thomas V. A., Lloyd, Alex, McKay, Ryan, Gibson‐Miller, Jilly, Levita, Liat, Mason, Liam, Martinez, Anton P., Hyland, Philip, Vallières, Frédérique, Karatzias, Thanos, Valiente, Carmen, Vazquez, Carmelo, and Bentall, Richard P.
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PSYCHOLOGICAL research ,MENTAL illness ,COVID-19 ,POST-traumatic stress ,COVID-19 pandemic - Abstract
Objectives: This paper outlines fieldwork procedures for Wave 4 of the COVID‐19 Psychological Research Consortium (C19PRC) Study in the UK during November–December 2020. Methods: Respondents provided data on socio‐political attitudes, beliefs, and behaviours, and mental health disorders (anxiety, depression, and posttraumatic stress). In Phase 1, adults (N = 2878) were reinvited to participate. At Phase 2, new recruitment: (i) replenished the longitudinal strand to account for attrition; and (ii) oversampled from the devolved UK nations to facilitate robust between‐country analyses for core study outcomes. Weights were calculated using a survey raking algorithm to ensure the longitudinal panel was representative of the baseline sample characteristics. Results: In Phase 1, 1796 adults were successfully recontacted and provided full interviews at Wave 4 (62.4% retention rate). In Phase 2, 292 new respondents were recruited to replenish the panel, as well as 1779 adults from Wales, Scotland, and Northern Ireland, who were representative of the socio‐political composition of the adult populations in these nations. The raking procedure successfully re‐balanced the longitudinal panel to within 1% of population estimates for selected socio‐demographic characteristics. Conclusion: The C19PRC Study offers a unique opportunity to facilitate and stimulate interdisciplinary research addressing important public health questions relating to the COVID‐19 pandemic. [ABSTRACT FROM AUTHOR]
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- 2022
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16. Detecting and describing stability and change in COVID-19 vaccine receptibility in the United Kingdom and Ireland.
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Hyland, Philip, Vallières, Frédérique, Hartman, Todd K., McKay, Ryan, Butter, Sarah, Bentall, Richard P., McBride, Orla, Shevlin, Mark, Bennett, Kate, Mason, Liam, Gibson-Miller, Jilly, Levita, Liat, Martinez, Anton P., Stocks, Thomas V. A., Karatzias, Thanos, and Murphy, Jamie
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COVID-19 vaccines ,COVID-19 ,VACCINE effectiveness ,VACCINATION ,PANEL analysis - Abstract
COVID-19 continues to pose a threat to global public health. Multiple safe and effective vaccines against COVID-19 are available with one-third of the global population now vaccinated. Achieving a sufficient level of vaccine coverage to suppress COVID-19 requires, in part, sufficient acceptance among the public. However, relatively high rates of hesitance and resistance to COVID-19 vaccination persists, threating public health efforts to achieve vaccine-induced population protection. In this study, we examined longitudinal changes in COVID-19 vaccine acceptance, hesitance, and resistance in two nations (the United Kingdom and the Republic of Ireland) during the first nine months of the pandemic, and identified individual and psychological factors associated with consistent non-acceptance of COVID-19 vaccination. Using nationally representative, longitudinal data from the United Kingdom (UK; N = 2025) and Ireland (N = 1041), we found that (1) COVID-19 vaccine acceptance declined in the UK and remained unchanged in Ireland following the emergence of approved vaccines; (2) multiple subgroups existed reflecting people who were consistently willing to be vaccinated ('Accepters': 68% in the UK and 61% in Ireland), consistently unwilling to be vaccinated ('Deniers': 12% in the UK and 16% in Ireland), and who fluctuated over time ('Moveable Middle': 20% in the UK and 23% in Ireland); and (3) the 'deniers' and 'moveable middle' were distinguishable from the 'accepters' on a range of individual (e.g., younger, low income, living alone) and psychological (e.g., distrust of scientists and doctors, conspiracy mindedness) factors. The use of two high-income, Western European nations limits the generalizability of these findings. Nevertheless, understanding how receptibility to COVID-19 vaccination changes as the pandemic unfolds, and the factors that distinguish and characterise those that are hesitant and resistant to vaccination is helpful for public health efforts to achieve vaccine-induced population protection against COVID-19. [ABSTRACT FROM AUTHOR]
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- 2021
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17. Context, design and conduct of the longitudinal COVID‐19 psychological research consortium study–wave 3.
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McBride, Orla, Butter, Sarah, Murphy, Jamie, Shevlin, Mark, Hartman, Todd K., Hyland, Philip, McKay, Ryan, Bennett, Kate M., Gibson‐Miller, Jilly, Levita, Liat, Mason, Liam, Martinez, Anton P., Stocks, Thomas VA, Vallières, Frédérique, Karatzias, Thanos, Valiente, Carmen, Vazquez, Carmelo, and Bentall, Richard P.
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COVID-19 ,PSYCHOLOGICAL research ,COVID-19 pandemic ,GENDER ,POLITICAL attitudes - Abstract
Objectives: The COVID‐19 Psychological Research Consortium (C19PRC) Study aims to assess the impact of the COVID‐19 pandemic in the adult population in multiple countries. This paper describes the third wave of the UK survey (the 'parent' strand of the Consortium) during July‐August 2020. Methods: Adults (N = 2025) who participated in the baseline and/or first follow‐up surveys were reinvited to participate in this survey, which assessed: (1) COVID‐19 related knowledge, attitudes, and behaviours; (2) the occurrence of common mental disorders; as well as the role of (3) psychological factors and (4) social and political attitudes, in influencing the public's response to the pandemic. Weights were calculated using a survey raking algorithm to ensure that the cross‐sectional sample is nationally representative in terms of gender, age, and household income, and representative of the baseline sample characteristics for household composition, ethnicity, urbanicity and born/raised in UK. Results: 1166 adults (57.6% of baseline participants) provided full interviews at Wave 3. The raking procedure successfully re‐balanced the cross‐sectional sample to within 1% of population estimates across selected socio‐demographic characteristics. Conclusion: This paper demonstrates the strength of the C19PRC Study data to facilitate and stimulate interdisciplinary research addressing important public health questions relating to the COVID‐19 pandemic. [ABSTRACT FROM AUTHOR]
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- 2021
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18. Monitoring the psychological, social, and economic impact of the COVID‐19 pandemic in the population: Context, design and conduct of the longitudinal COVID‐19 psychological research consortium (C19PRC) study.
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McBride, Orla, Murphy, Jamie, Shevlin, Mark, Gibson‐Miller, Jilly, Hartman, Todd K., Hyland, Philip, Levita, Liat, Mason, Liam, Martinez, Anton P., McKay, Ryan, Stocks, Thomas VA, Bennett, Kate M., Vallières, Frédérique, Karatzias, Thanos, Valiente, Carmen, Vazquez, Carmelo, and Bentall, Richard P.
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ECONOMIC impact of disease ,COVID-19 ,COVID-19 pandemic ,PSYCHOLOGICAL research ,POLITICAL attitudes ,POLITICAL psychology - Abstract
Objectives: The C19PRC study aims to assess the impact of the COVID‐19 pandemic in the adult population of the UK, Republic of Ireland, and Spain. This paper describes the conduct of the first two waves of the UK survey (the "parent" strand of the Consortium) during March–April 2020. Methods: A longitudinal, internet panel survey was designed to assess: (1) COVID‐19 related knowledge, attitudes, and behaviors; (2) the occurrence of common mental health disorders as well as the role of (3) psychological factors and (4) social and political attitudes, in influencing the public's response to the pandemic. Quota sampling (age, sex, and household income) was used to recruit a nationally representative sample of adults. Results: Two thousand and twenty five adults were recruited at baseline, and 1406 were followed‐up one‐month later (69.4% retention rate). The baseline sample was representative of the UK population in relation to economic activity, ethnicity, and household composition. Attrition was predicted by key socio‐demographic characteristics, and an inverse probability weighting procedure was employed to ensure the follow‐up sample was representative of the baseline sample. Conclusion: The C19PRC study data has strong generalizability to facilitate and stimulate interdisciplinary research on important public health questions relating to the COVID‐19 pandemic. [ABSTRACT FROM AUTHOR]
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- 2021
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19. Pandemic buying: Testing a psychological model of over-purchasing and panic buying using data from the United Kingdom and the Republic of Ireland during the early phase of the COVID-19 pandemic.
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Bentall, Richard P., Lloyd, Alex, Bennett, Kate, McKay, Ryan, Mason, Liam, Murphy, Jamie, McBride, Orla, Hartman, Todd K., Gibson-Miller, Jilly, Levita, Liat, Martinez, Anton P., Stocks, Thomas V. A., Butter, Sarah, Vallières, Frédérique, Hyland, Philip, Karatzias, Thanos, and Shevlin, Mark
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CONSUMER behavior ,PSYCHOLOGICAL tests ,COVID-19 pandemic ,PANDEMICS ,PSYCHOLOGICAL factors ,PSYCHOLOGICAL distress - Abstract
The over-purchasing and hoarding of necessities is a common response to crises, especially in developed economies where there is normally an expectation of plentiful supply. This behaviour was observed internationally during the early stages of the Covid-19 pandemic. In the absence of actual scarcity, this behaviour can be described as 'panic buying' and can lead to temporary shortages. However, there have been few psychological studies of this phenomenon. Here we propose a psychological model of over-purchasing informed by animal foraging theory and make predictions about variables that predict over-purchasing by either exacerbating or mitigating the anticipation of future scarcity. These variables include additional scarcity cues (e.g. loss of income), distress (e.g. depression), psychological factors that draw attention to these cues (e.g. neuroticism) or to reassuring messages (eg. analytical reasoning) or which facilitate over-purchasing (e.g. income). We tested our model in parallel nationally representative internet surveys of the adult general population conducted in the United Kingdom (UK: N = 2025) and the Republic of Ireland (RoI: N = 1041) 52 and 31 days after the first confirmed cases of COVID-19 were detected in the UK and RoI, respectively. About three quarters of participants reported minimal over-purchasing. There was more over-purchasing in RoI vs UK and in urban vs rural areas. When over-purchasing occurred, in both countries it was observed across a wide range of product categories and was accounted for by a single latent factor. It was positively predicted by household income, the presence of children at home, psychological distress (depression, death anxiety), threat sensitivity (right wing authoritarianism) and mistrust of others (paranoia). Analytic reasoning ability had an inhibitory effect. Predictor variables accounted for 36% and 34% of the variance in over-purchasing in the UK and RoI respectively. With some caveats, the data supported our model and points to strategies to mitigate over-purchasing in future crises. [ABSTRACT FROM AUTHOR]
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- 2021
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20. Under the Hood: Using Computational Psychiatry to Make Psychological Therapies More Mechanism-Focused.
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Nair, Akshay, Rutledge, Robb B., and Mason, Liam
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PSYCHIATRY ,NEURAL circuitry ,PSYCHIATRIC treatment ,MENTAL illness ,COGNITIVE therapy ,IMPLICIT attitudes - Abstract
Psychological therapies, such as CBT, are an important part of the treatment of a range of psychiatric disorders such as depression and anxiety. There is a growing desire to understand the mechanisms by which such therapies effect change so as to improve treatment outcomes. Here we argue that adopting a computational framework may be one such approach. Computational psychiatry aims to provide a theoretical framework for moving between higher-level psychological states (like emotions, decisions and beliefs) to neural circuits, by modeling these constructs mathematically. These models are explicit hypotheses that contain quantifiable variables and parameters derived from each individual's behavior. This approach has two advantages. Firstly, some of the variables described by these models appears to reflect the neural activity of specific brain regions. Secondly, the parameters estimated by these models may offer a unique description of a patient's symptoms which can be used to both tailor therapy and track its effect. In doing so this approach may offer some additional granularity in understanding how psychological therapies, such as CBT, are working. Although this field shows significant promise, we also highlight several of the key hurdles that must first be overcome before clinical translation of computational insights can be realized. [ABSTRACT FROM AUTHOR]
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- 2020
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21. Cognitive Behavioral Therapy Normalizes Functional Connectivity for Social Threat in Psychosis.
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Mason, Liam, Peters, Emmanuelle R., Dima, Danai, Williams, Steven C., and Kumari, Veena
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BRAIN anatomy ,ANALYSIS of variance ,COGNITIVE therapy ,MAGNETIC resonance imaging ,MULTIVARIATE analysis ,PARANOIA ,PSYCHOLOGICAL tests ,PSYCHOSES ,RESEARCH funding ,T-test (Statistics) - Published
- 2016
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22. Better Than I Thought: Positive Evaluation Bias in Hypomania.
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Mason, Liam, O'Sullivan, Noreen, Bentall, Richard P., and El-Deredy, Wael
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MANIA , *AFFECTIVE disorders , *HYPOMANIA , *PSYCHOSES , *DRUG therapy , *HEALTH outcome assessment - Abstract
Background: Mania is characterised by increased impulsivity and risk-taking, and psychological accounts argue that these features may be due to hypersensitivity to reward. The neurobiological mechanisms remain poorly understood. Here we examine reinforcement learning and sensitivity to both reward and punishment outcomes in hypomania-prone individuals not receiving pharmacotherapy. Method: We recorded EEG from 45 healthy individuals split into three groups by low, intermediate and high self-reported hypomanic traits. Participants played a computerised card game in which they learned the reward contingencies of three cues. Neural responses to monetary gain and loss were measured using the feedback-related negativity (FRN), a component implicated in motivational outcome evaluation and reinforcement learning. Results: As predicted, rewards elicited a smaller FRN in the hypomania-prone group relative to the low hypomania group, indicative of greater reward responsiveness. The hypomania-prone group also showed smaller FRN to losses, indicating diminished response to negative feedback. Conclusion: Our findings indicate that proneness to hypomania is associated with both reward hypersensitivity and discounting of punishment. This positive evaluation bias may be driven by aberrant reinforcement learning signals, which fail to update future expectations. This provides a possible neural mechanism explaining risk-taking and impaired reinforcement learning in BD. Further research will be needed to explore the potential value of the FRN as a biological vulnerability marker for mania and pathological risk-taking. [ABSTRACT FROM AUTHOR]
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- 2012
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23. REWARD PROCESSING IN CHILDREN WITH PSYCHOTIC-LIKE EXPERIENCES.
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Harju-Seppänen, Jasmine, Mason, Liam, Bramon, Elvira, and Bell, Vaughan
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CONFERENCES & conventions ,PSYCHOSES ,REWARD (Psychology) ,CHILDREN - Abstract
Background: Individuals with psychosis display an attenuated response to reward. However, it has not yet been established whether individuals with psychotic-like experiences (PLEs) also exhibit alterations in reward anticipation. Methods: The present study examined whether non-distressing and distressing PLEs were associated with functional activity in the nucleus accumbens during reward anticipation. The sample consisted of 10313 children from the ABCD study aged 9–10 who had participated in the Monetary Incentive Delay task. PLEs were measured using the Prodromal Questionnaire Brief Child version and functional activity was measured using regional fMRI summary statistics for reward anticipation activation (data release 2.0, contrast of expected large reward versus neutral expectation). Linear mixed-effects models were used to investigate the relationship between reward anticipation and PLEs (distressing and non-distressing), whilst controlling for gender, household income, ethnicity, BMI and affective symptoms. The analyses were weighted by the average standard error of the mean activation in the accumbens. Separate linear mixed-effects models were conducted for the right and left hemisphere. Results: 6169 (59.8%) of the children did not report any PLEs, compared to 2270 (22.0%) with non-distressing PLEs and 1874 (18.2%) with distressing PLEs. We ran a regression to examine the association between reward anticipation and PLEs (distressing or non-distressing) and found that nondistressing PLEs were related to reduced reward anticipation in the right nucleus accumbens (P = 0.009). However, there was no significant association between reward anticipation and PLEs when adjusting for potential confounders. Discussion: In the present study of 9–10 year olds, reward anticipation was not associated with PLEs. As previous research has found reductions in reward anticipation in individuals with schizophrenia, further follow-up studies of the ABCD cohort are needed to explore whether these associations emerge during adolescence. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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- View/download PDF
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