Dopamine release in the brain is associated with heightened focus, narrowed perception, and increased focus on external stimuli.

“Dopamine is released from neurons. It's what we call a neurom modulator. And in particular, dopamine creates a heightened state of focus. It tends to contract our visual world. And it tends to make us pay attention to things that are outside and beyond the confines of our skin. It's what we call exterosception.”