# Preferential Looking Procedure In addition to HPP, BITTSy also allows testing using the Preferential Looking Paradigm (Golinkoff, Ma, Song, & Hirsh-Pasek, 2013). During this procedure, children are presented with pairs of images (or animated objects) on a screen. This can include familiar (e.g., a hand) or unfamiliar items (e.g., an object that the child would not know the label for). Sometimes the objects are presented one at a time (e.g., during familiarization and training), and sometimes they appear in pairs or in groups of 4 images. Images are accompanied by speech stimuli, which may include sentences either teaching children a new word, or instructing them to look at one of the objects on the screen. A digital camera positioned near the screen (typically above or below) records children’s eye movements. Videos of the test-sessions are then coded off-line on a frame-by-frame basis by trained research assistants, to measure participants' fixations and to calculate accuracy and reaction times across trials. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://ldevumd.gitbook.io/bittsy/goals-and-capabilities/paradigms/preferential-looking-procedure.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.