a. Inform the caregivers and make sure the infant is fine
When the families arrive, make sure to bring them to the experimental room as soon as possible and inform them there. This way, the infant can already get used to the experimental conditions that might be very unfamiliar (i.e., many distracting cables and equipment being around, different lighting conditions, etc.).
Put a nice, comfortable chair for the caregiver to sit on in front of the screen. Letting the infant sit on the caregiver’s lap might increase movement artefacts in comparison to letting them sit in an infant’s chair. However, the infant might feel more comfortable on the caregiver’s lap and be less fussy. Decide how to arrange infant and caregiver depending on the specific experiment. If you let the infant sit on the caregiver’s lap, make sure to have some pillows available to make it more comfortable for the caregiver if necessary. This way you can at least reduce movements from the caregiver.
If you do not have the head circumference of the infant yet, make sure to measure it and prepare the R-Net. As you best have two experimenters ready for the whole experiment, one can continue informing the caregivers, while the other is preparing the cap.
We usually bring a cap in a different size to show the caregivers the cap and explain again how it works. In the meantime, you can give the infant an interesting toy.
Ask the caregiver if they think the infant is fine. Offer the possibility to feed the infant. Often caregivers think that the infant will make it through the experiment, and they will feed the infant afterwards. However, it is better to have the infant as happy as possible before the experiment.