In every tradition mantra plays a great role. Especially in Hinduism it has a divine spiritual effect. The both hemisphere of the brain’s cell can be activated and cultivated through this. There are some Sanskrit mantras which are fallowing bellow.
Gayatri mantra; “om bhoorbhuah swah tats vitur varanyam, bhargo devasya dheemahi dhiyo yo nah prachodayat”
A great mantra in Indian society, means
Another sloka of Patanjali Yog Darshan; “prayatn shaitilya ananta samapatti abbhyama”
When you start chanting brain gets exercise and having improvement in talent. When mind repeat these slokas or any mantra through the support of brain then brain becomes active and alert. Not repetition as my own experience of spirituality, mantra focus on so many section of brain. Even exercises of pranayam also give good effect on both right and left hemisphere of the brain. As example; exercise through left nostril breathing, our right side of the brain become started and right nostril breathing activates left side of the brain.