Body mass correlates inversely with inhibitory control in response to food among adolescent girls: An fMRI study
Section snippets
Participants
Participants were 39 adolescent girls (M age = 15.7; SD = 0.93); 2% Asian/Pacific Islanders, 2% African Americans, 86% European Americans, 5% Native Americans, and 5% mixed racial heritage. Participants from a larger study of female high school students who appeared to meet the inclusion criteria for the present imaging study were asked if they were interested in participating in a study on the neural response to presentation of food. Those who reported binge eating or compensatory behaviors in the
Behavioral data
Median reaction time for go trials was 651 ms (SD 140 ms). Median reaction time for no-go trials that were incorrectly responded to was 588 ms (SD 261 ms). The mean rate of commission errors was 11.3% (SD 13.5) and the mean rate of omission errors was 2.5% (SD 4.5). Median reaction time to go trials was negatively correlated with baseline BMI (N = 35, rs = −0.54, p = 0.001), such that subjects with higher BMI scores showed significantly faster reaction times (Fig. 1). Median reaction time to all food
Discussion
In the current study, we used a food-specific go/no-go task to investigate behavioral and neural correlates of response inhibition to appetizing food in adolescent girls who ranged from lean to obese. Behaviorally, participants with higher BMI scores responded significantly more quickly to go food stimuli and made a significantly greater number of commission errors, failing to inhibit their responses to the images of desserts. Results suggests that participants with higher BMIs are more willing
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