Grounded in Self-Determination Theory (Deci & Ryan, 1985, 2000), the purpose of this thesis was to investigate the protective role of self-determined (i.e., autonomous motivation) relative to non self-determined motivation (i.e., controlled motivation) in response to various media portrayals of the female body. Findings from three laboratory experiments support these hypotheses. Women who felt less self-determined in their daily activities (Study 1 and Study 3) and in the regulation of their eating behaviors (Study 2), perceived more pressure from the media to be thin (Study 1), experienced more body dissatisfaction (Study 1 and Study 2), expressed greater concerns over the quantity of food in their diets (Study 1), and reported more negative affect (Study 2) following exposure to a video which exemplified the societal ―thin ideal‖ compared to a video which did not. They also generated more negative self-appraisals of their body‘s appearance and competence (Study 3), experienced more body shame (Study 3), and reported more introjected reasons for restricting their actual intake of chocolate (Study 3) following exposure to video which depicted the female body as an instrument of women‘s actions compared to one which depicted the female body as object (Study 3). Conversely, women who felt more self-determined in their daily activities (Study 1 and Study 3) expressed greater concerns over the quality of food in their diet (Study 1) and reported less vitality (Study 3) in response to media portrayals of women engaged in self-care (Study 1) and physical activities (Study 3). However, body dissatisfied women who felt more self-determined in the regulation of their eating behaviors (Study 2) formulated more intentions to monitor their food intake and eat fewer unhealthy foods (Study 2) after viewing a video of thin female models compared to no models. Together, these findings support a protective function for self-determined motivation and a potentiating function for non self-determined motivation.

Grounded in Self-Determination Theory (Deci & Ryan, 1985, 2000), the purpose of this thesis was to investigate the protective role of self-determined (i.e., autonomous motivation) relative to non self-determined motivation (i.e., controlled motivation) in response to various media portrayals of the female body. Findings from three laboratory experiments support these hypotheses. Women who felt less self-determined in their daily activities (Study 1 and Study 3) and in the regulation of their eating behaviors (Study 2), perceived more pressure from the media to be thin (Study 1), experienced more body dissatisfaction (Study 1 and Study 2), expressed greater concerns over the quantity of food in their diets (Study 1), and reported more negative affect (Study 2) following exposure to a video which exemplified the societal ―thin ideal‖ compared to a video which did not. They also generated more negative self-appraisals of their body‘s appearance and competence (Study 3), experienced more body shame (Study 3), and reported more introjected reasons for restricting their actual intake of chocolate (Study 3) following exposure to video which depicted the female body as an instrument of women‘s actions compared to one which depicted the female body as object (Study 3). Conversely, women who felt more self-determined in their daily activities (Study 1 and Study 3) expressed greater concerns over the quality of food in their diet (Study 1) and reported less vitality (Study 3) in response to media portrayals of women engaged in self-care (Study 1) and physical activities (Study 3). However, body dissatisfied women who felt more self-determined in the regulation of their eating behaviors (Study 2) formulated more intentions to monitor their food intake and eat fewer unhealthy foods (Study 2) after viewing a video of thin female models compared to no models. Together, these findings support a protective function for self-determined motivation and a potentiating function for non self-determined motivation.

Grounded in Self-Determination Theory (Deci & Ryan, 1985, 2000), the purpose of this thesis was to investigate the protective role of self-determined (i.e., autonomous motivation) relative to non self-determined motivation (i.e., controlled motivation) in response to various media portrayals of the female body. Findings from three laboratory experiments support these hypotheses. Women who felt less self-determined in their daily activities (Study 1 and Study 3) and in the regulation of their eating behaviors (Study 2), perceived more pressure from the media to be thin (Study 1), experienced more body dissatisfaction (Study 1 and Study 2), expressed greater concerns over the quantity of food in their diets (Study 1), and reported more negative affect (Study 2) following exposure to a video which exemplified the societal ―thin ideal‖ compared to a video which did not. They also generated more negative self-appraisals of their body‘s appearance and competence (Study 3), experienced more body shame (Study 3), and reported more introjected reasons for restricting their actual intake of chocolate (Study 3) following exposure to video which depicted the female body as an instrument of women‘s actions compared to one which depicted the female body as object (Study 3). Conversely, women who felt more self-determined in their daily activities (Study 1 and Study 3) expressed greater concerns over the quality of food in their diet (Study 1) and reported less vitality (Study 3) in response to media portrayals of women engaged in self-care (Study 1) and physical activities (Study 3). However, body dissatisfied women who felt more self-determined in the regulation of their eating behaviors (Study 2) formulated more intentions to monitor their food intake and eat fewer unhealthy foods (Study 2) after viewing a video of thin female models compared to no models. Together, these findings support a protective function for self-determined motivation and a potentiating function for non self-determined motivation.

Grounded in Self-Determination Theory (Deci & Ryan, 1985, 2000), the purpose of this thesis was to investigate the protective role of self-determined (i.e., autonomous motivation) relative to non self-determined motivation (i.e., controlled motivation) in response to various media portrayals of the female body. Findings from three laboratory experiments support these hypotheses. Women who felt less self-determined in their daily activities (Study 1 and Study 3) and in the regulation of their eating behaviors (Study 2), perceived more pressure from the media to be thin (Study 1), experienced more body dissatisfaction (Study 1 and Study 2), expressed greater concerns over the quantity of food in their diets (Study 1), and reported more negative affect (Study 2) following exposure to a video which exemplified the societal ―thin ideal‖ compared to a video which did not. They also generated more negative self-appraisals of their body‘s appearance and competence (Study 3), experienced more body shame (Study 3), and reported more introjected reasons for restricting their actual intake of chocolate (Study 3) following exposure to video which depicted the female body as an instrument of women‘s actions compared to one which depicted the female body as object (Study 3). Conversely, women who felt more self-determined in their daily activities (Study 1 and Study 3) expressed greater concerns over the quality of food in their diet (Study 1) and reported less vitality (Study 3) in response to media portrayals of women engaged in self-care (Study 1) and physical activities (Study 3). However, body dissatisfied women who felt more self-determined in the regulation of their eating behaviors (Study 2) formulated more intentions to monitor their food intake and eat fewer unhealthy foods (Study 2) after viewing a video of thin female models compared to no models. Together, these findings support a protective function for self-determined motivation and a potentiating function for non self-determined motivation.