The Four Realms of Existence are biological neurobiological cognitive and conscious - during yoga you can experience one or all of them!

Neuroscientist Joseph LeDoux proposes a framework of human existence consisting of four nested and entwined realms:

Biological Realm: This is the foundational realm, encompassing all living things and the fundamental processes that make life possible.
Neurobiological Realm: Building upon the biological, this realm is characterized by the presence of a nervous system, allowing for faster and more precise control of the body. Most animals fall into this category.
Cognitive Realm: Within the neurobiological, some organisms develop the capacity to create internal representations of the world around them, using these "mental models" to guide their behavior. This is the cognitive realm.
Conscious Realm: The highest level in LeDoux's framework, this realm involves having inner experiences and thoughts about the world, allowing for a subjective Understanding of life and our existence in and around us.

Love and peace always,

Eileen