This is a very well thought out and researched article about the benefits of pretend play, specifically creating and playing with puppets.
The [Puppet School] curriculum establishes the tenets of puppeteering education, which put educational theories about the importance of play and grit and resilience into practice.
In the beginning classes, students start to learn basic head and mouth movements, using motor skills in both hands and both arms, choreographed to pre-existing sound tracks of well-known pop songs. Students learn to articulate vowels and develop a sense of rhythm with their bodies. As the exercises advance, students learn to improvise using their own voices and hand movements, and eventually choreograph movement to material they’ve written. From motor skills, to communication and improv skills, then finally written skills, students exercise many parts of their brains at Puppet School, increasing communication between their two brain hemispheres.
According to Eric Jensen’s Teaching with the Brain in Mind, when brain signals are passed from one side to the other quickly, or when the left and right sides of bodies work simultaneously, the brain is able to function more efficiently, and the stronger the brain’s connections become—thereby improving literacy, movement coordination, processing data, and communication skills.