________ scans are more difficult to obtain from infants and younger children because they require that participants stay very still for somewhat prolonged periods of time.

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fMRI scans require participants to remain very still for extended periods, making them challenging for infants and young children who may not understand the need to remain still. PET scans also require some level of immobility, but they also require exposure to radiation, which is generally avoided in pediatric research whenever possible. MFG (Magnetic Field Gradient) and ERP (Event-Related Potential) are not imaging techniques but rather technical components of some imaging methods, so they are not relevant to this question.

________ Scans Are More Difficult to Obtain from Infants and Younger