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Appetite ; 128: 242-254, 2018 09 01.
Artigo em Inglês | MEDLINE | ID: mdl-29906489


Every day, people are exposed to images of appetizing foods that can lead to high-calorie intake and contribute to overweight and obesity. Research has documented that manipulating the visual perspective from which eating is viewed helps resist temptation by altering the appraisal of unhealthy foods. However, the neural basis of this effect has not yet been examined using neuroimaging methods. Moreover, it is not known whether the benefits of this strategy can be observed when people, especially overweight, are not explicitly asked to imagine themselves eating. Last, it remains to be investigated if visual perspective could be used to promote healthy foods. The present work manipulated camera angles and tested whether visual perspective modulates activity in brain regions associated with taste and reward processing while participants watch videos featuring a hand grasping (unhealthy or healthy) foods from a plate during functional magnetic resonance imagining (fMRI). The plate was filmed from the perspective of the participant (first-person perspective; 1PP), or from a frontal view as if watching someone else eating (third-person perspective; 3PP). Our findings reveal that merely viewing unhealthy food cues from a 1PP (vs. 3PP) increases activity in brain regions that underlie representations of rewarding (appetitive) experiences (amygdala) and food intake (superior parietal gyrus). Additionally, our results show that ventral striatal activity is positively correlated with body mass index (BMI) during exposure to unhealthy foods from a 1PP (vs. 3PP). These findings suggest that unhealthy foods should be promoted through third-person (video) images to weaken the reward associated with their simulated consumption, especially amongst overweight people. It appears however that, as such, manipulating visual perspective fails to enhance the perception of healthy foods. Their promotion thus requires complementary solutions.

Dieta Saudável/psicologia , Ingestão de Alimentos/psicologia , Comportamento Alimentar/psicologia , Percepção Gustatória/fisiologia , Percepção Visual/fisiologia , Adulto , Encéfalo/diagnóstico por imagem , Sinais (Psicologia) , Feminino , Humanos , Imaginação , Imagem por Ressonância Magnética , Masculino , Estimulação Luminosa/métodos , Recompensa
Integr Psychol Behav Sci ; 49(2): 216-38, 2015 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-25579747


Subjective Evidence Based Ethnography (SEBE) is a method designed to access subjective experience. It uses First Person Perspective (FPP) digital recordings as a basis for analytic Replay Interviews (RIW) with the participants. This triggers their memory and enables a detailed step by step understanding of activity: goals, subgoals, determinants of actions, decision-making processes, etc. This paper describes the technique and two applications. First, the analysis of professional practices for know-how transferring purposes in industry is illustrated with the analysis of nuclear power-plant operators' gestures. This shows how SEBE enables modelling activity, describing good and bad practices, risky situations, and expert tacit knowledge. Second, the analysis of full days lived by Polish mothers taking care of their children is described, with a specific focus on how they manage their eating and drinking. This research has been done on a sub-sample of a large scale intervention designed to increase plain water drinking vs sweet beverages. It illustrates the interest of SEBE as an exploratory technique in complement to other more classic approaches such as questionnaires and behavioural diaries. It provides the detailed "how" of the effects that are measured at aggregate level by other techniques.

Antropologia Cultural/métodos , Tomada de Decisões , Objetivos , Entrevista Psicológica/métodos , Conhecimento , Adulto , Feminino , Humanos , Masculino , Gravação em Vídeo