What is the term for the physiological reflex causing many sharks to enter a trance-like state when inverted?

Answer

Tonic immobility

Tonic immobility is a capacity of the nervous system where a shark becomes temporarily inactive, often observed when they are gently flipped upside down.

What is the term for the physiological reflex causing many sharks to enter a trance-like state when inverted?
anatomybodyFeaturecharacteristicshark