The Roles of Group Identity and Ideology in Examining the Effects of Social Consensus on Weight Bias
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THE ROLES OF GROUP IDENTITY AND IDEOLOGY IN EXAMINING THE EFFECTS OF SOCIAL CONSENSUS ON WEIGHT BIAS Amanda Gumble A Dissertation Submitted to the Graduate College of Bowling Green State University in partial fulfillment of the requirements for the degree of DOCTOR OF PHILOSOPHY August 2012 Committee: Robert Carels, Advisor William O’Brien Dara Musher-Eizenman Nancy Orel © 2012 Amanda Gumble All Rights Reserved iii ABSTRACT Robert Carels, Advisor Weight bias is strongly influenced by multiple sources, including attributions of blame, social consensus, and ideological beliefs. Social consensus interventions have shown promise in reducing weight bias, especially when the consensus information comes from an in-group. No research has looked at the effects of social consensus when coming from an individual’s in-group based on weight status. Given that overweight and obese individuals appear to lack a strong in- group identity, it is possible that social consensus could be less effective in reducing bias for these individuals compared to normal weight individuals, who appear to possess a strong in- group identity. This study sought to determine the effects of social consensus based on weight status on both explicit and implicit weight bias for normal weight and overweight individuals. The study also sought to determine whether Protestant work ethic and just world beliefs would moderate these effects and lessen the effects of social consensus. Participants included approximately 110 students at Bowling Green State University. The current study found an impact of social consensus feedback on positive explicit bias, as well as negative explicit bias when covariates were not controlled for. Group identification, just world beliefs, and Protestant work ethic beliefs did not moderate the relationship between social consensus feedback and explicit and implicit bias. However, individuals receiving feedback from their in-group demonstrated decreased implicit bias whereas individuals receiving feedback from their out- group demonstrated increased implicit bias. Further research is needed to learn about the impact of social consensus on explicit and implicit bias, as well as the moderators of this relationship. iv ACKNOWLEDGMENTS First, I would like to thank my advisor, Robert Carels, for his continuous support throughout this project. Without his guidance, encouragement, and help, it would not have been possible to complete this dissertation. I would also like to thank my committee members, William O’Brien, Dara Musher-Eizenman, and Nancy Orel for their support, advice, and input. Finally, I would like to thank my friends and family for their love and support. I would especially like to thank my fiancé, Rob Quinby, for his love, support, understanding, and encouragement, all of which has been greatly appreciated during this time. v TABLE OF CONTENTS Page CHAPTER 1. INTRODUCTION……………………………………………………………. 1 Overview…...………………………………………………………............................. 1 Assessment of Weight Bias……………...…………………………………………… 2 Sources of Weight Bias……………………………………………………………….. 2 Consequences……………...………………………………………………………….. 4 Attribution Theory………………..…………………………………………………… 5 Social Ideologies and Weight Bias……………………………………………............... 8 Social Consensus Theory and Social Identity…………………………………............... 9 Social Consensus Theory and Weight Bias……………………………...……............. 13 Current Aims……………………..……………………………………………............. 19 Hypotheses……………………………………………………………........................... 19 CHAPTER II: METHODS……………………………………...……………………….......... 22 Participants…………………………………………………………………………….... 22 Study Design……………………………………………………………………………. 22 Measures………………………………………………………………………………... 23 BMI………………………………………………........................................…... 23 Demographic Questionnaire…….……………………………………………… 23 Obese Persons Trait Survey (OPTS)………………….………………………. 24 Implicit Associations Test (IAT)………..…………………………………… 24 Group Identification Scale……..………..…………………………………… 26 Protestant Ethic Scale………….………..…………………………………… 26 vi Global Belief in a Just World Scale (GBJWS)………..…...………………… 27 Marlowe-Crowne Social Desirability Scale………..………………………… 27 Data Analysis…………………………………………………………………………. 28 CHAPTER III: RESULTS…………………..……………………………………………...... 30 Descriptive Statistics………………………………………………………………...... 30 Demographics………...……………………………………………………………....... 30 Pre-Test Correlations………………………….……………………………………….. 31 Hypothesis #1…………………………………………………………………………… 32 Hypothesis #2…………………………………................................................................ 33 Hypothesis #3………………………………………………………………………...…..36 Hypothesis #4……………………………………………………………………..…….. 38 CHAPTER IV: DISCUSSION……………….…………………………………………………40 Hypothesis #1………………………………………………………………..…………...40 Hypothesis #2………………………………………………………………….……….. 42 Hypothesis #3……………………………………………………..…………………….. 45 Hypothesis #4…………………………………………………………….……………....47 Limitations and Implications…………………………………………………………….49 Future Research………………………………………………………………………….50 REFERENCES…………………………………………………………………………………. 52 NOTE……………………………………………………………………………………….....…61 APPENDIX A. OPTS………………………………………………………………………….. 62 APPENDIX B. IAT……………………………………………………………………………...63 APPENDIX C. GIS……………………………………………………………………………... 64 vii APPENDIX D. PES………………………………………………………………..………….. 65 APPENDIX E. GBJWS……………………………………………………………………….. 66 APPENDIX F. Marlow-Crowne Social Desirability Scale…………..……………………….. 67 APPENDIX G. Consensus Feedback Form #1……….……………………………………….. 68 APPENDIX H. Consensus Feedback Form #2…………………………………….………….. 72 APPENDIX I. Consensus Feedback Form #3…………………………………………..…….. 76 APPENDIX J. Post-Hoc Analyses…………..…………………………………………..…….. 80 APPENDIX K. HSRB Approval....................................................................................................83 viii LIST OF FIGURES/TABLES Figure/Table Page 1 Differences in explicit bias between time 1 and time 2 without covariates……….…... 83 2 Differences in implicit bias between time 1 and time 2 without covariates…………... 84 3 Interactions between weight status, feedback form, and bias for the motivated/lazy trial…………………………………………………………………….. 85 4 Baseline variables……….……………………………………………….……………. 86 5 Pearson correlations among baseline variables.……...………………………………..... 87 6 Effects of weight status and feedback form on bias………...…………………………...88 7 Hierarchical regression of group identification on explicit and implicit weight bias…………..…………………………………………………………………...89 8 Hierarchical regression of Protestant ethic beliefs on explicit and implicit weight bias………………….…………………………………………………….……...92 9 Hierarchical regression of just world beliefs on explicit and implicit weight bias….……………………………………………………………………………94 1 INTRODUCTION Overview Obese individuals are highly stigmatized in the US, and they face multiple forms of prejudice (i.e., bias), mistreatment, and discrimination. Weight bias consists of negative attitudes toward and beliefs about others because of their weight. These attitudes and beliefs often lead to the mistreatment and discrimination of obese individuals. Examples of mistreatment and discrimination are being avoided or stared at, being subjected to the negative comments of others, or being passed over for a promotion because of one’s weight (Puhl and Brownell, 2006). Unlike other forms of discrimination, which have remained stable over the past ten years (i.e., gender, race, age, ethnicity), weight discrimination has increased. For example, between 1996 and 2006, people’s perceived weight discrimination increased from 7% to 12% (Andreyeva, Puhl, and Brownell, 2008). A review of the literature on weight stigma will begin by discussing multiple sources and consequences of weight bias, as well as common assessment tools for assessing weight bias. Common theories used to explain weight bias (i.e., attribution, social ideology, social identity, and social consensus) and interventions designed to reduce weight bias will also be noted. Finally, the role of social consensus in increasing or decreasing weight bias will be explained. This investigation sought to determine whether the effects of social consensus information on explicit and implicit weight bias for normal and overweight individuals is differentially influenced by group identity based on weight status as well as ideological beliefs in the Protestant work ethic and just world beliefs. 2 Assessment of Weight Bias Weight bias may be conceptualized in a number of ways and assessed using a variety of methods. Most common is the assessment of explicit attitudes. Explicit attitudes, which are commonly assessed with self-report measures, reflect attitudes of which individuals are consciously aware. In addition to strong explicit anti-fat attitudes, there is considerable evidence that most individuals possess strong implicit anti-fat attitudes. Implicit attitudes are conceptualized to be outside of individuals’ awareness and conscious control (Greenwald and Banaji, 1995). Relative to explicit attitudes, implicit attitudes often differentially predict stigmatizing behavior toward individuals. Whereas explicit attitudes more often predict deliberative responses, such as written evaluations of individuals, implicit attitudes more often predict spontaneous and nonverbal behaviors, such as the amount of time spent looking at someone during a conversation (Dovidio, Kawakami, Johnson, Johnson, and Howard, 1997). Sources of Weight Bias One of the most prevalent and surprising sources of weight bias is parents and family members. In one study, 13% of