Thorndike’s Law of Effect provides a framework for understanding the selection of behaviors given specific environmental reward contingencies. Though a highly influential model, especially given its resurgence in popularity to understand habitual behaviors, it fails to predict several well-documented behavioral phenomena and incorrectly views extinction as the unlearning of a previously acquired association. Blaisdell, Stolyarova, & Stahlman (2016) proposed modifications to Thorndike’s original law that addresses these issues and greatly increases the model’s explanatory power. This modified model also provides a testable account of the Partial Reinforcement Extinction Effect (PREE). The PREE is the paradoxical finding of more rapid extinction to a continuously reinforced cue compared to a partially reinforced cue, and has challenged many theoretical accounts of learning. Two experimental paradigms, one using pigeons and the other using humans, show support for the Modified Law of Effect’s explanation of the PREE.
It is unclear if, and to what extent, the human memory system is biased towards food and food relevant stimuli. Drawing upon existing demonstrations of attentional biases to high calorie food images, and findings that evolutionarily relevant stimuli are preferentially remembered, we hypothesized that images of high calorie foods would be better remembered than images of low calorie foods and nonfood items. Investigating this is important because a general bias towards remembering high calorie images might facilitate greater incentive learning towards these images which could result in cue-induced overconsumption. We tested this in two pre-registered, within-subject studies (ns = 38). In Experiment 1, using a rapid stream visual presentation procedure and recognition memory test, we found no effect of image type (high calorie, low calorie, nonfood) on recognition for previously seen images (F < 1.0). However, we did observe fewer correct rejections (i.e. more false memories) for novel low calorie images. In Experiment 2, we used a longer encoding procedure and free recall memory test and similarly failed to observe an effect of image type on recall (F < 1.0). We did discover several other factors that correlate with image memory which we discuss along with the implications of these results and directions for future research.
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