Refer to figure.
HABITUATION
Habituation is a variation of the brain's reaction to nerve impulses of a given intensity. A stimulus may be alarming and trigger immediate attention when presented for the first time. However, after several perceptions of that same stimulus without any consequence, the alarming character may be lost of attenuated.

After approximately 15 to 30 seconds of constant angular acceleration, such as what occurs during a steady turn, the vestibular system stabilizes to the angular velocity and the pilot may have the illusion that rotation has ceased (sensory habituation).