ManyBabies 1: Secondary Analysis of 'Lab Factors' and Fuss-Out Rates

The ManyBabies 1 project, a large-scale collaboration of developmental psychology labs to replicate a classic finding – infants' preference for infant-directed over adult-directed speech – provides a unique opportunity not only to take stock of the field and discover how our methods and approaches differ, but to being to understand the factors that make these effects so difficult to measure. Here, we are preregistering a plan to analyze additional variables collected alongside the main MB1 project, consisting of a wide range of 'lab factors' that researchers believe may impact either whether a baby fusses out of a study, or whether they truly attend to stimuli (and thus produce an expected effect in the study.) This is an exploratory project, designed to guide further research, but because of the size, sprawl, and uniqueness of this dataset, we aim to use it as well as possible, by pre-registering our analytic plan and, where possible, holding out part of the dataset to allow for confirmation of exploratory effects.

ManyBabies 1项目，一项由发展心理学实验室进行的大规模合作，旨在复制一项经典发现——婴儿对面向婴儿的言语而非面向成人的言语的偏好——为审视该领域并探究我们的方法与途径之差异提供了独特的机遇，同时亦有助于揭示导致这些效应难以测量的因素。在此，我们预先注册了一项分析计划，以研究MB1项目收集的附加变量，包括一系列研究者认为可能影响婴儿是否因研究而烦躁不安，或是否真正关注刺激（从而在研究中产生预期效应）的“实验室因素”。这是一个探索性项目，旨在指导进一步研究，但由于该数据集规模庞大、分布广泛且具有独特性，我们旨在充分利用它，通过预先注册我们的分析计划，并在可能的情况下，保留部分数据集以供验证探索性效应。