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Unity is a software specifically designed for the development of video games.However, due to its programming possibilities and the polyvalence of itsarchitecture, it can prove to be a versatile tool for stimuli presentation inresearch experiments. Nevertheless, it also has some limitations and conditionsthat need to be taken into account to ensure optimal performance in particularexperimental situations. Such is the case if we want to use it in anexperimental design that includes the acquisition of biometric signalssynchronized with the broadcasting of video and audio in real time. In thepresent paper, we analyse how Unity (version 5.5.1f1) reacts in one suchexperimental design that requires the execution of audio-visual material. Fromthe analysis of an experimental procedure in which the video was executedfollowing the standard software specifications, we have detected the followingproblems desynchronization between the emission of the video and the audio;desynchronization between the temporary counter and the video; a delay in theexecution of the screenshot; and depending on the encoding of the video a badfluency in the video playback, which even though it maintains the totalplayback time, it causes Unity to freeze frames and proceed to compensate withlittle temporary jumps in the video. Finally, having detected all the problems,a compensation and verification process is designed to be able to work withaudio-visual material in Unity (version 5.5.1f1) in an accurate way. We presenta protocol for checks and compensations that allows solving these problems toensure the execution of robust experiments in terms of reliability.

Synchronizing Audio-Visual Film Stimuli in Unity (version 5.5.1f1): Game Engines as a Tool for Research