The MIRC is as small as a flash drive and is built into a holster that the infants wear. Moreover, the MIRC is smaller than the multiple devices that the infants would have to wear otherwise and can be adjusted to a wide age range. to make audio recordings such as the LENA Pro or measure physiological activity like the Sproutling) the information is synchronized and can be analyzed in relation to each other. Additionally, by using one device instead of several that are commercially available (e.g. The MIRC was developed to make physiological measurements possible in real life situations instead of a laboratory setting. The use of the wearable device allows the researcher to learn from infants’ interaction and communication without disturbing these processes or the natural environment in which they live. A small, wearable device is particularly necessary when working with infants and in the field. However, physiological measurements on infants have mainly been dependent on lab situations. Arousal, particularly the level of arousal, plays a role in learning. The background of developing the MIRC was that by observing infants interacting with their environment, we have no information about the processes that happen inside the child. It has been developed from similar devices that have been used successfully in ornithological studies at the Max Planck Institute in Seewiesen over the last years. It records physiological arousal, the distance of major caregivers and interactional partners (who wear a related device), the general whereabouts of the child using a relative GPS and the vocalizations infants make and the audio input they experience (though the speech is not intelligible for privacy reasons). The MIRC is a miniaturized multimodal interaction recorder for children which has been designed for a research project on communication development in Hadza hunter-gatherer infants in Tanzania.
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