Replication Of Processing Of Task-irrelevant Food Information In Oddball Fast Periodic Visual Stimulation - Info and Reading Options

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Food information has a high reward value for human beings, and may be more so for those who are overweight or obese. Stimuli with high reward value may be particularly conspicuous, demanding our attention even when we are attending to something else. Yet, the nature and neural signals of potential biased processing of food information remains unclear. Moreover, despite decades of research, a reliable measure of food information processing remains elusive, making it a methodological bottleneck in obesity and disordered eating research. To address the nature of biased attention processing, we ask 1) how attention is biased toward two cardinal properties of food information, namely, healthfulness and tastiness, even though the food information is irrelevant to the task at hand; and 2) whether and how such processing might be dependent on the demandingness of the central task (i.e., perceptual load). In our previous study which has been preregistered, we recruited 32 participants and measured their responses to infrequent visual food information embedded in streams of other visual objects in EEG, specifically, by using a variant of steady-state visual evoked potential (SSVEP), oddball fast periodic visual stimulation (FPVS). The infrequent food objects (i.e., oddballs) are one of four different combinations in different trials based on healthfulness and tastiness: 1) high healthfulness and high tastiness; 1) high healthfulness and low tastiness; 3) low healthfulness and high tastiness; and 4) low healthfulness and low tastiness. The perceptual load of the central task is either low (detection of a certain color of letters) or high (detection of certain combinations of color and identity of letters). In this study, the results demonstrated robust and reliable implicit categorization of food information at the individual level for all 32 participants, with the effect not modulated by perceptual load or tastiness (but might be by healthfulness). Since oddball FPVS is a novel paradigm applied to studying food information processing, it would be critical to replicate the findings in order to develop FPVS as a reliable measure of food information processing as well as apply this tool to obesity or other clinical sample with eating disorders. In particular, the modulating effect of healthfulness observed was not salient and requires further evidence. Furthermore, the lack of modulation by tastiness and perceptual load also warrants replication. Therefore, we plan to conduct a replication study with the same paradigm and sample size to validate our previous findings.

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