Bhairava mudra when right hand is placed on top of the left, and both are resting on the lap... used during pranayama. Bhairavi, when left hand is placed on top. They affect the different brain hemispsheres. Left hand- Bhairavi -- Ida nadi -- the female, cool, side to us(Introvert). The Pingala, right hand, Bhairava mudra, is the active, male side. U can choose which aspect of you u wish to create with just shifting hand positions.