Table 1

Modified sedation rating scale

0No observable sedation; monkey is alert to environment
1Monkey is attentive to ordinary movements of observer
2Monkey responds to clapping noise in room
3Monkey responds only to noises generated by knocking on  its chair
4Monkey responds only to clapping noise ∼2 feet away  from its head
5Monkey responds only to touch
6Monkey does not respond to touch