TABLE 1.

Behavior measurements referring to evaluating grades of stereotypy.

Score	Stereotypy
0	No stereotypy or normal activitya
1	Discontinuous circling behaviorb Occasional head twitching
2	Occasionally vertical dyskinetic head and neck movements Occasional sniffing, licking, and biting
3	Continuous circling behavior, increased body raising Increased sniffing, repetitive grooming (such as paw-to-mouth movements)c
4	Increased lateral and vertical dyskinetic head and neck movements

^aSuch as immobility (no visible movement of the animal).

^bSuch as clockwise/counterclockwise circling, loosely circular path traced on the cage floor.

^cSuch as head-down sniffing (nose in contact with the floor), grooming (self-cleaning with mouth or paws), and face washing (forepaws moving back and forth from the ears to the snout and mouth).