A music therapist records the following responses after the initial assessment of an infant:
- When the music therapist played a maraca in front of the infant, the infant reached for the maraca.
- When the music therapist played and moved a bell, the infant tracked the bell.
- When the music therapist sang the infant's name, the infant kicked his legs and smiled.
What domain is the music therapist primarily assessing?
Select one of the following: