Two experiments were conducted to verify the influence of various mental simulations on the effectiveness and persistence of weight loss processes. In study one, 40 female students (aged 19-27, M = 23) who were eager to lose weight were randomly assigned to one of four groups: positive outcome simulation, process simulations, mixed simulations (process followed by negative outcome), and control (no simulations). Students from the mixed and process simulation groups lost significantly more weight after five weeks than participants from the outcome simulation and control groups. A total of 106 females (aged 19-45, M = 29) participated in study two, in which five types of mental simulations were tested. Besides the images used in study one, process followed by positive outcome simulations and negative outcome simulations were implemented. Results showed that process followed by positive outcome simulations lead to the highest persistence in the weight loss process, while process followed by negative outcome simulations induced the greatest reduction in weight. Both studies revealed self-regulatory benefits from mental simulations in difficult and long-term personal goal attainment.
Classical motivation theories assumed that the probability of success in goal striving process (including weight loss) depended on two factors: likelihood of success and attractiveness of the result. However, research referring to obesity showed that motivational factors are not sufficient in effective weight loss. In other words, obese people value anticip ated weight loss but still do not succeed in this process. It is implied by the fact that effectiveness and persistence of this process depend also on volitional factor. This factor refers to self-control mechanisms, which mediate between intention to reach the goal and its enactment. The current empirical data suggest that implementation intentions and mental simulations are especially beneficial techniques of self-control enhancement. This chapter will unveil main theories and research concerning self-control mechanisms and influence of various mental simulations and implementation intentions in weight loss process and weight-related behaviors. Moreover, our empirical data concerning individual differences in self-control of weight loss process are presented.
The study explores the influence of individual tendencies toward mood improvement/deterioration and the Big Five personality traits on mood changes. Participants (218 students) completed NEO-FFI and The Mood Regulation Scales. Based on the within-person structure of individual tendencies toward mood improvement/deterioration four mood regulative types were distinguished (increasing, decreasing, hot and cool type). In the experimental stage participants were randomly assigned to one of four group conditions created by experimental factors: (1) induced mood (positive/negative), and (2) the level of cognitive loading (easy/hard condition). Direct (Mood Adjective Check List) and indirect (emotional version of Lexical Decision Task) measurements were used to assess mood changes. The results showed different patterns of mood changes for increasing and decreasing regulative types. Those differences were visible especially in the positive mood regulation. While the decreasing type decreased the induced positive mood, the increasing type was characterized by mood changes manifested in energetic arousal increase and tense reduction. Moreover, high Neuroticism and low Extraversion in the decreasing type contributed to a negative mood increment manifested in reduction of energetic arousal. The same effect was revealed for high Conscientiousness for the increasing type. The results are discussed in the context of psychological status of mood regulation strategies (automatic/controlled) and with reference to previous research in this area.
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