〔報 文〕健康な大学生のIowa Gambling Task(IGT)における意志決定

石川, 史子, 仲前, 朋美, 村端, 舞, 山中, 健太郎, ISHIKAWA, Fumiko, NAKAMAE, Tomomi, MURAHATA, Mai, YAMANAKA, Kentaro

Impaired performance on the Iowa gambling task(IGT)comes when participants prefer high immediate gain despite higher future losses. Previous studies demonstrated that obese individuals and patients with eating disorders, characterized as they are by a preference for high immediate reward(excessive food intake)despite higher future punishment(weight gain), showed deficits on the IGT. Therefore, we hypothesized that, even in healthy(normal-weight)participants, perfor- mance on IGT is related to their body size, daily eating behavior, emotional and physiological states. In this study, we addressed the relationships between learning patterns of decision-making on the IGT and daily eating behavior(Dutch Eating Behavior Questionnaire: DEBQ), subjective states(visual analog scale for appetite and 9×9 Affect Grid for mood and arousal states), body size(weights, BMI, and %fat), and physiological indices for autonomic and prefrontal functions in 15 healthy university students(8 female, 7 male). Autonomic and prefrontal functions were assessed by power spectrum of heart rate variability and asymmetry in alpha-band electroencephalographic power at rest before the IGT. Consequently, a subgroup of participants(5/15)who have moderate sympathetic activities and prefrontal negative inhibitory tendencies could learn successfully to make advantageous choices on the IGT. The other subgroup(5/15)who have hyper-sympathetic activities and prefrontal positive approach tendencies learned to make disadvantageous choices on the IGT. Moreover, in the successful learning group, body size and restrained and emotional eating scores tended to be smaller, and subjective appetite scores tended to be higher, than those in the less successful learning group. A third subgroup(5/15)who have low sympathetic activities could not learn to make advantageous or disadvantageous choices on the IGT. Overall results are consistent with previous studies suggesting that autonomic and prefrontal function is related to IGT performance even in healthy participants.

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KJ00008913539

〔報文〕健康な大学生のIowa Gambling Task(IGT)における意志決定

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