Playtime is an opportunity to encourage the development of children's senses (touch, smell, hearing, sight and taste). Through the development of the senses can promote the physical and mental development of children.

The dominant activity is the activity that determines the most important changes in psychological processes and in the psychological characteristics of human personality at a certain stage of development. Accordingly, the dominant activity according to the right age will help children explore the world around them, forming their emotional awareness of people.

Scientists have done a lot of research on emotions, and have also given many definitions of emotions such as "emotions are responses to important internal and external events" or "Emotions include a set of coordinated responses, which may include mechanisms through speech, physiology, behavior, and neurology". The article below suggests ways to choose play activities to increase children's happy hormones.

Autism spectrum disorder (ASD) is defined as a group of neurodevelopmental disorders characterized by impairments in social interaction and communication as well as stereotyped and repetitive behaviors and limited life functions. When children with autism participate in a music therapy program that uses musical instruments, they respond to the sounds made by each instrument. They pass and share the instrument with other members of the group. They learn to listen to music and this can improve their listening ability and also reduce their hearing sensitivity. Music therapy is effective in creating an ideal interaction between the therapist and the child through the use of musical instruments as a means of communication. The child learns to communicate by using musical cues and encouraging eye contact. Using musical instruments can help autistic people break down social barriers, which helps to develop effective interaction and communication skills.

Pretend play in children (imitation play) is expressed through children imitating actions/sounds from everyday activities and transferring them into their play activities. This is the highest level of play, expressing children's social skills, creativity and imagination in different ways.