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Dores AR, Peixoto M, Fernandes C, Geraldo A, Griffiths MD, Barbosa F. Neurophysiological Correlates of Near-Wins in Gambling: A Systematic Literature Review. J Gambl Stud 2024:10.1007/s10899-024-10327-1. [PMID: 39102018 DOI: 10.1007/s10899-024-10327-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/13/2024] [Indexed: 08/06/2024]
Abstract
Identification of specific patterns of brain activity related to problem gambling may provide a deeper understanding of its underlying mechanisms, highlighting the importance of neurophysiological studies to better understand development and persistence of gambling behavior. The patterns of cognitive functioning have been investigated through electroencephalography (EEG) studies based on the near-win/near-miss (NW) effect. The main goal of the present study was to evaluate the neurophysiological basis of NWs and their modulation by gambling problems through a systematic review of event-related potentials (ERP) studies elicited by feedback events. The review followed the recommendations of the Preferred Reporting Items for Systematic Reviews and Meta-Analysis Protocols (PRISMA). A total of 15 studies were included, 12 comprising non-problem gamblers (NPGs) and three comparing problem gamblers (PGs) with matched controls. For the P300 component, the win outcome elicited a larger amplitude than the other outcomes (NW and loss), followed by the NW outcome, which elicited a larger amplitude than loss in some studies. For feedback-related negativity (FRN), the loss outcome evoked a more negative amplitude in several studies, despite eliciting a similar amplitude to NW outcomes in others. For PGs, the NW outcome evoked a higher amplitude of P300 than loss, while NPGs showed a similar amplitude to both outcomes. The present review gathered information from different sources and provides a consistent view of the different studies. However, studies lack systematic and robust methodologies, leading to inconsistent results and making it difficult to reach any definitive conclusions.
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Affiliation(s)
- Artemisa Rocha Dores
- Laboratório de Reabilitação Psicossocial - Centro de Investigação em Reabilitação (LabRP-CIR), Escola Superior de Saúde, Polytechnic Institute of Porto, Rua Dr. António Bernardino de Almeida, 400, Porto, 4200-072, Portugal.
- Laboratory of Neuropsychophysiology, Faculty of Psychology and Education Sciences, University of Porto, Rua Alfredo Allen, Porto, 4200-135, Portugal.
| | - Miguel Peixoto
- Laboratório de Reabilitação Psicossocial - Centro de Investigação em Reabilitação (LabRP-CIR), Escola Superior de Saúde, Polytechnic Institute of Porto, Rua Dr. António Bernardino de Almeida, 400, Porto, 4200-072, Portugal
- Laboratory of Neuropsychophysiology, Faculty of Psychology and Education Sciences, University of Porto, Rua Alfredo Allen, Porto, 4200-135, Portugal
| | - Carina Fernandes
- Laboratory of Neuropsychophysiology, Faculty of Psychology and Education Sciences, University of Porto, Rua Alfredo Allen, Porto, 4200-135, Portugal
- Faculty of Human and Social Sciences, University Fernando Pessoa, Porto, Portugal
| | - Andreia Geraldo
- Laboratório de Reabilitação Psicossocial - Centro de Investigação em Reabilitação (LabRP-CIR), Escola Superior de Saúde, Polytechnic Institute of Porto, Rua Dr. António Bernardino de Almeida, 400, Porto, 4200-072, Portugal
- Laboratory of Neuropsychophysiology, Faculty of Psychology and Education Sciences, University of Porto, Rua Alfredo Allen, Porto, 4200-135, Portugal
| | - Mark D Griffiths
- International Gaming Research Unit, Psychology Department, Nottingham Trent University, 50 Shakespeare Street, Nottingham, UK
| | - Fernando Barbosa
- Laboratory of Neuropsychophysiology, Faculty of Psychology and Education Sciences, University of Porto, Rua Alfredo Allen, Porto, 4200-135, Portugal
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Mestre-Bach G, Granero R, Fernández-Aranda F, Potenza MN, Jiménez-Murcia S. Roles for Alexithymia, Emotion Dysregulation and Personality Features in Gambling Disorder: A Network Analysis. J Gambl Stud 2023; 39:1207-1223. [PMID: 36434175 DOI: 10.1007/s10899-022-10164-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/29/2022] [Indexed: 11/26/2022]
Abstract
Although there is a growing interest in exploring the specific role of both emotional regulation processes and alexithymia in gambling disorder (GD), evidence remains scarce. In order to delve deeper into the complex interactions between these factors, the present study aimed at exploring a network of the core GD-related features, including GD symptomatology and severity, emotion dysregulation, alexithymia, and personality features. The sample included N = 739 treatment-seeking patients with GD (691 men and 48 women), aged 18-78 years (mean age = 39.2, SD = 13.2). The DSM-5 diagnostic criteria were assessed in, and the South Oaks Gambling Screen, Difficulties in Emotion Regulation Scale (DERS), and Temperament and Character Inventory-Revised were administered to, participants. A network analysis was conducted to reveal inter-relationships between these elements. Three nodes related to emotion dysregulation showed the most critical position in the whole network of the present study: "lack of emotional awareness", "non-acceptance of emotional responses", and "difficulties engaging in goal-directed behaviors". When analyzing emotional dysregulation using the different DERS subscales, two independent clusters were identified. One cluster encompassed alexithymia dimensions ("lack of awareness" and "lack of clarity"), while the other cluster included all other emotion-dysregulation dimensions. Identification of the emotion-dysregulation- and GD-related features with the highest centrality/linkage may be particularly useful for developing valid measurement tools and precise management plans for individuals with GD.
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Affiliation(s)
- Gemma Mestre-Bach
- Universidad Internacional de La Rioja, La Rioja, Spain
- Institute for Culture and Society (ICS), University of Navarra, Pamplona, Spain
| | - Roser Granero
- Departament de Psicobiologia i Metodologia de Les Ciències de La Salut, Universitat Autònoma de Barcelona, Barcelona, Spain
- Ciber Fisiopatología Obesidad y Nutrición (CIBERObn), Instituto de Salud Carlos III, Madrid, Spain
- Psychoneurobiology of Eating and Addictive Behaviors Group, Neurosciences Programme, Bellvitge Biomedical Research Institute (IDIBELL), Barcelona, Spain
| | - Fernando Fernández-Aranda
- Ciber Fisiopatología Obesidad y Nutrición (CIBERObn), Instituto de Salud Carlos III, Madrid, Spain
- Department of Psychiatry, Bellvitge University Hospital-IDIBELL, Barcelona, Spain
- Department of Clinical Sciences, School of Medicine, University of Barcelona, Barcelona, Spain
- Psychoneurobiology of Eating and Addictive Behaviors Group, Neurosciences Programme, Bellvitge Biomedical Research Institute (IDIBELL), Barcelona, Spain
| | - Marc N Potenza
- Department of Psychiatry, Yale University School of Medicine, New Haven, CT, USA.
- Department of Neuroscience, Yale University, New Haven, CT, USA.
- Child Study Center, Yale University School of Medicine, New Haven, CT, USA.
- Connecticut Council on Problem Gambling, Wethersfield, CT, USA.
- Connecticut Mental Health Center, New Haven, CT, USA.
- Wu Tsai Institute, Yale University, New Haven, CT, USA.
| | - Susana Jiménez-Murcia
- Ciber Fisiopatología Obesidad y Nutrición (CIBERObn), Instituto de Salud Carlos III, Madrid, Spain.
- Department of Psychiatry, Bellvitge University Hospital-IDIBELL, Barcelona, Spain.
- Department of Clinical Sciences, School of Medicine, University of Barcelona, Barcelona, Spain.
- Psychoneurobiology of Eating and Addictive Behaviors Group, Neurosciences Programme, Bellvitge Biomedical Research Institute (IDIBELL), Barcelona, Spain.
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Brito CJ, Chagas ALDS, Brito MAD, Müller VT, Noronha ÁS, Coswig V, Teixeira FG, Soto DAS, Miarka B. Mental toughness and physical fitness tests of boxing athletes associated with big five personality factors. REVISTA BRASILEIRA DE CINEANTROPOMETRIA E DESEMPENHO HUMANO 2023. [DOI: 10.1590/1980-0037.2023v25e87135] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
ABSTRACT The present study related to boxing athletes' mental toughness and physical fitness performances with Big Five Factors. For this, the sample was composed of eleven recreational boxers who competed at the state level and were regularly training (technical and tactical) 4 times a week during the evaluation period. The 44-item Big Five Inventory (BFI) measures the Big Five dimensions of Conscientiousness, Agreeableness, Neuroticism, Openness, and Extraversion and the 14-item Sports Mental Toughness Questionnaire (SMTQ) were applied with Strength, Power, and Endurance Tests, Pearson and Spearman's correlations were used to verify the association between BFI, physical and mental tests, respectively, p≤.05. Our results demonstrated that significant and strong correlation between agreeableness factor and sit-ups test, with 40.85±12.36 freq./min (r=.72, p=.02) and, in SMTQ, a strong correlation between Neuroticism and Control [10(9;12) score, r=.76, p≤0.01], Constancy [10(9;12) score, r=.84, p≤0.01] and Total SMQT [37(34;37) score, r=.84, p≤0.01]. In conclusion, these results suggest that Neuroticism factors are associated with mental toughness, while the agreeableness factor is related to muscular endurance capability. Mental toughness and endurance results are associated with boxers' personalities whose drive motivates them relentlessly towards success and promotes thriving in boxing training environments or during championships.
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Dudfield FWH, Malouff JM, Meynadier J. The Association between the Five-factor Model of Personality and Problem Gambling: a Meta-analysis. J Gambl Stud 2022; 39:669-687. [PMID: 35604521 PMCID: PMC10175427 DOI: 10.1007/s10899-022-10119-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2021] [Revised: 03/18/2022] [Accepted: 03/20/2022] [Indexed: 01/08/2023]
Abstract
AbstractThis meta-analysis examined the associations between five-factor personality model traits and problem gambling. To be eligible for inclusion in the meta-analysis, studies had to provide effect size data that quantified the magnitude of the association between all five personality traits and problem gambling. Studies also had to use psychometrically sound measures. The meta-analysis included 20 separate samples from 19 studies and 32,222 total participants. The results showed that problem gambling was significantly correlated with the five-factor model of personality. The strongest personality correlate of problem gambling was neuroticism r = .31, p = < 0.001, 95% CI [0.17, 0.44], followed by conscientiousness r = − .28, p = < 0.001, 95% CI [-0.38,-0.17] ), agreeableness r = − .22, p = < 0.001, 95% CI [-0.34, − 0.10], openness r = − .17, p = < 0.001, 95% CI [-0.22,-0.12], and extraversion r = − .11, p = .024, 95% CI [-0.20,-0.01]. These results suggest problem gamblers tend to share a common personality profile – one that could provide clues as to the most effective ways to prevent and to treat problem gambling.
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Affiliation(s)
| | - John M Malouff
- University of New England Psychology, Armidale, NSW 2351, Australia.
| | - Jai Meynadier
- University of New England Psychology, Armidale, NSW 2351, Australia
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Phenotype of Gambling Disorder Patients with Lotteries as a Preferred Form of Gambling. Int J Ment Health Addict 2022. [DOI: 10.1007/s11469-022-00793-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022] Open
Abstract
Abstract
Lottery gambling can become an addictive behavior which can significantly interfere with daily functioning. The objectives of this work were to estimate the prevalence of lottery gambling, to assess the profile related to this gambling type in a large clinical sample of patients who met criteria for gambling disorder (GD), and to compare this profile with the other two non-strategic forms of gambling (slot-machines and bingo). Sample included n = 3,531 patients consecutively attended for treatment-seeking due to gambling-related problems. All the participants met criteria for GD and were into the range of 18 to 85 years old. Sociodemographic variables, GD severity, psychopathological state, and personality traits were assessed. Statistical comparisons between the groups defined by the patients’ gambling preference (lotteries versus other gambling activities) were conducted, with chi-square test and analysis of variance. The prevalence of lotteries as the only gambling activity was 2.5%, 8.9% for lottery gambling as primary activity with other secondary gambling types, and 20.6% for lotteries as primary or secondary gambling activity. Lottery gambling and bingo gambling were more prevalent among women (bingo included the highest percentage of women). Compared to slot machine gambling, lotteries and bingo grouped older patients and those with later age of onset of the gambling-related problems. Bingo gambling showed the highest psychological distress and the most dysfunctional personality traits. This study shows the high frequency of lottery gambling among treatment-seeking for GD patients, and it provides empirical evidence about the profile associated with this gambling activity compared to other non-strategic gambling forms. The likelihood of lottery gambling is higher for women, patients married or living with a stable partner, and those within higher social position indexes.
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Spychala KM, Gizer IR, Davis CN, Dash GF, Piasecki TM, Slutske WS. Predicting disordered gambling across adolescence and young adulthood from polygenic contributions to Big 5 personality traits in a UK birth cohort. Addiction 2022; 117:690-700. [PMID: 34342067 PMCID: PMC8810893 DOI: 10.1111/add.15648] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/03/2020] [Accepted: 07/14/2021] [Indexed: 11/28/2022]
Abstract
BACKGROUND AND AIMS Previous research has demonstrated phenotypical associations between disordered gambling (DG) and Big 5 personality traits, and a twin study suggested that shared genetic influences accounted for a substantial portion of this relation. The present study examined associations between DG and polygenic scores (PSs) for Big 5 traits to measure the shared genetic underpinnings of Big 5 personality traits and DG. DESIGN Zero-inflated negative binomial regression models estimated associations between Big 5 PSs and past-year and life-time assessments of DG in a longitudinally assessed population-based birth cohort. SETTING United Kingdom. PARTICIPANTS A total of 4729 unrelated children of European ancestry from the Avon Longitudinal Study of Parents and Children (ALSPAC) with both phenotypical and genetic data. MEASUREMENTS Phenotypical outcomes included past-year assessment of DG using the problem gambling severity index (PGSI) and life-time assessment of DSM-IV pathological gambling symptoms (DPG) across the ages of 17, 20 and 24 years. Polygenic scores were derived for the Big 5 personality traits of agreeableness, extraversion, conscientiousness, openness and neuroticism using summary statistics from genome-wide association studies (GWAS). FINDINGS PSs for agreeableness [β= - 0.25, standard error (SE) = 0.054, P = 3.031e-6, ΔR2 = 0.008] and neuroticism (β=0.14, SE = 0.046, P = 0.0017, ΔR2 = 0.002) significantly predicted PGSI scores over and above included covariates (i.e. sex and first five ancestral principal components). PSs for agreeableness (β= - 0.20, SE = 0.056, P = 0.00036, ΔR2 = 0.003) and neuroticism, when interactions with age were taken into account (β = 0.29, SE = 0.090, P = 0.002, ΔR2 = 0.004), also predicted DPG scores. CONCLUSIONS Polygenic contributions to low agreeableness and high neuroticism appear to predict two measures of disordered gambling (problem gambling severity index and life-time assessment of DSM-IV pathological gambling symptoms). Polygenic scores for neuroticism interact with age to suggest that the positive association becomes stronger from adolescence through young adulthood.
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Affiliation(s)
- Kellyn M Spychala
- Department of Psychological Sciences, University of Missouri, Columbia, MO, USA
| | - Ian R Gizer
- Department of Psychological Sciences, University of Missouri, Columbia, MO, USA
| | - Christal N Davis
- Department of Psychological Sciences, University of Missouri, Columbia, MO, USA
| | - Genevieve F Dash
- Department of Psychological Sciences, University of Missouri, Columbia, MO, USA
| | - Thomas M Piasecki
- Department of Psychological Sciences, University of Missouri, Columbia, MO, USA
| | - Wendy S Slutske
- Department of Psychological Sciences, University of Missouri, Columbia, MO, USA
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Tessier S, Romo L, Zerhouni O. Impact of Advertising Campaigns Among Online Gamblers: The Role Perceptions of Social Support and Personality Traits. Front Psychiatry 2021; 12:599988. [PMID: 34764890 PMCID: PMC8576387 DOI: 10.3389/fpsyt.2021.599988] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/28/2020] [Accepted: 09/07/2021] [Indexed: 11/16/2022] Open
Abstract
Background: Few studies on problematic gamblers have focused on how environment and personality interact in gambling behavior. The aim of this research is to investigate how social support, dimensions of personality, and advertising campaigns are associated with gambling among problematic or moderate-risk gamblers and recreational gamblers and associated with online gambling (i.e., sport and poker). Methods: One hundred nine participants (45% problematic or moderate-risk gamblers) answered an online survey including social support, five factor models of personality, typology of gamblers, and several sociodemographic variables. Results: We found that problematic and moderate-risk gamblers were significantly more sensitive to gambling advertisements compared to light players. Social support was significantly lower among online gamblers compared to offline gamblers, but no association was found between social support and type of gamblers. Problematic and moderate-risk gamblers presented lower levels of extraversion compared with recreational gamblers. Notably, when the onset of gambling is before 18 years old, participants had more chances to recall more gambling advertisements as adults. Conclusion: We propose that future longitudinal research should focus on characteristics of online gamers particularly regarding social support to understand this low level of adequacy compared to offline gamblers.
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Affiliation(s)
- Samantha Tessier
- Département de Psychologie, Clinique Psychanalyse Développement, Nanterre, France
| | - Lucia Romo
- Département de Psychologie, Clinique Psychanalyse Développement, Nanterre, France
- AP-HP (Paris Hospital), Occupational Health Unit, Poincaré University Hospital, Garches, France
| | - Oulmann Zerhouni
- Département de Psychologie, Laboratoire Parisien de Psychologie Sociale, Nanterre, France
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von der Heiden JM, Egloff B. Associations of the Big Five and locus of control with problem gambling in a large Australian sample. PLoS One 2021; 16:e0253046. [PMID: 34125840 PMCID: PMC8202919 DOI: 10.1371/journal.pone.0253046] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2020] [Accepted: 05/27/2021] [Indexed: 11/19/2022] Open
Abstract
Gambling may range from being a recreational leisure activity to a behavioral addiction. A rising number of gamblers experience adverse consequences from gambling, termed problem gambling, which may become a challenge for the individual and society. With the present research, we aimed to investigate the correlates of problem gambling. We used a large sample of more than 12,500 individuals (46% male, Mage = 48, SDage = 18) from the Household, Income, and Labour Dynamics in Australia (HILDA) Survey and analyzed sociodemographic and personality variables (Big Five, locus of control) as well as the extent of problem gambling. Findings showed that male sex and a lower level of education were related to problem gambling, but personality traits were predictive of problem gambling over and above sociodemographic variables. Specifically, a low level of emotional stability, an external locus of control, and, to a lesser extent, a low level of conscientiousness and a high level of extraversion were predictive of problem gambling, whereas openness and agreeableness were not. These results remained constant across various robustness analyses. Our findings reveal the importance of including personality traits when explaining gambling behavior.
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Affiliation(s)
| | - Boris Egloff
- Department of Psychology, Johannes Gutenberg University Mainz, Mainz, Germany
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Strømme R, Børstad KH, Rø AE, Erevik EK, Sagoe D, Chegeni R, Aune Mentzoni R, Kaur P, Pallesen S. The Relationship Between Gambling Problems and the Five-Factor Model of Personality: A Systematic Review and Meta-Analysis. Front Psychiatry 2021; 12:740235. [PMID: 34712156 PMCID: PMC8545825 DOI: 10.3389/fpsyt.2021.740235] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/12/2021] [Accepted: 09/13/2021] [Indexed: 12/22/2022] Open
Abstract
Objectives: The aim of the present meta-analysis was to synthesize results from the association between problem gambling (PG) and dimensions of the five factor model of personality and to identify potential moderators (gambling diagnosis: yes/no, comorbidity: yes/no and trait assessment: four or fewer items vs. five items or more) of these associations in meta-regressions. Methods: Searches were conducted in six databases; Medline, Web of Science, PsychInfo, Google Scholar, OpenGrey, and Cochrane Library (conducted on February, 22, 2021). Included studies: (1) reported a relationship between PG and at least one of the personality traits in the five-factor model, (2) contained information of zero-order correlations or sufficient data for such calculations, and (3) were original articles published in any European language. Case-studies, qualitative studies, and reviews were excluded. All articles were independently screened by two authors. Final agreement was reached through discussion or by consulting a third author. Risk of bias of the included studies was assessed by the Newcastle-Ottawa Scale. Data were synthesized using a random effects model. Results: In total 28 studies, comprising 20,587 participants, were included. The correlations between PG and the traits were as follows: Neuroticism: 0.273 (95% CI = 0.182, 0.358), conscientiousness -0.296 (95% CI = -0.400, -0.185), agreeableness -0.163 (95% CI = -0.223, -0.101), openness -0.219 (95% CI = -0.308, -0.127), and extroversion -0.083 (95% CI = -0.120, -0.046). For all meta-analyses the between study heterogeneity was significant. Presence of gambling diagnosis was the only moderator that significantly explained between-study variance showing a more negative correlation to extroversion when participants had a gambling diagnosis compared to when this was not the case. Discussion: The results indicated some publication bias. Correcting for this by a trim-and-fill procedure showed however that the findings were consistent. Clinicians and researchers should be aware of the associations between personality traits and PG. Previous studies have for example showed neuroticism to be related to treatment relapse, low scores on conscientiousness to predict treatment drop-out and agreeableness to reduce risk of treatment drop-out. Systematic Review Registration: PROSPERO (CRD42021237225).
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Affiliation(s)
- Rune Strømme
- Department of Psychosocial Science, University of Bergen, Bergen, Norway
| | | | - Andrea Eftang Rø
- Department of Psychosocial Science, University of Bergen, Bergen, Norway
| | - Eilin Kristine Erevik
- Department of Psychosocial Science, University of Bergen, Bergen, Norway.,Norwegian Competence Centre for Gambling and Gaming Research, University of Bergen, Bergen, Norway
| | - Dominic Sagoe
- Department of Psychosocial Science, University of Bergen, Bergen, Norway.,Norwegian Competence Centre for Gambling and Gaming Research, University of Bergen, Bergen, Norway
| | - Razieh Chegeni
- Department of Psychosocial Science, University of Bergen, Bergen, Norway
| | - Rune Aune Mentzoni
- Department of Psychosocial Science, University of Bergen, Bergen, Norway.,Norwegian Competence Centre for Gambling and Gaming Research, University of Bergen, Bergen, Norway
| | - Puneet Kaur
- Department of Psychosocial Science, University of Bergen, Bergen, Norway
| | - Ståle Pallesen
- Department of Psychosocial Science, University of Bergen, Bergen, Norway.,Norwegian Competence Centre for Gambling and Gaming Research, University of Bergen, Bergen, Norway.,Optentia, The Vaal Triangle Campus of the North-West University, Vanderbijlpark, South Africa
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