# Overview BITTSy runs a number of standard infant/toddler testing paradigms, such as the Headturn Preference Procedure, Preferential Looking Paradigm, and Visual Fixation Procedure. It allows researchers to use either lights or videos as attention-getters and to present stimuli on any given trial that are either audio-only, visual only, or audio-visual. Experimenters can fully determine which stimuli to present on which trials, whether trials are repeated, and whether stimuli are presented in a fixed order, randomized within blocks, or fully randomized. They can set the relative timing of all presentation events, and set up multiple phases within an experiment. Experimenters can specify whether individual stimuli, trials, and experimental phases continue for fixed amounts of time or continue until the child reaches a particular looking/listening criterion. Investigators can [code infant looking during testing](/bittsy/running-protocols/live-coding.md), or off-line from recordings. BITTSy creates a raw ("low-level") [log file](/bittsy/data-output/detailed-log-file.md) of all events that occur within a session. However, it also includes a [separate analysis module](/bittsy/data-output/the-reporting-module.md) to summarize the data in a more usable fashion based on standard analysis requirements. This dual file-function allows an experimenter to go back and reanalyze different aspects of the data at a later time, an option that is not available in most current infant systems. In the following discussion, we refer to several standard infant paradigms by acronyms: * **HPP:** [Headturn Preference Procedure ](/bittsy/goals-and-capabilities/paradigms/the-headturn-preference-procedure.md) * **HVFP:** [Visual Fixation Procedure / Habituation](/bittsy/goals-and-capabilities/paradigms/visual-fixation-procedure.md) * **PLP:** [Preferential Looking Procedure / Looking while Listening](/bittsy/goals-and-capabilities/paradigms/preferential-looking-procedure.md) --- # 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/bittsy-basics/overview.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.